linux-stable/fs/ubifs/tnc_commit.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* Authors: Adrian Hunter
* Artem Bityutskiy (Битюцкий Артём)
*/
/* This file implements TNC functions for committing */
#include <linux/random.h>
#include "ubifs.h"
/**
* make_idx_node - make an index node for fill-the-gaps method of TNC commit.
* @c: UBIFS file-system description object
* @idx: buffer in which to place new index node
* @znode: znode from which to make new index node
* @lnum: LEB number where new index node will be written
* @offs: offset where new index node will be written
* @len: length of new index node
*/
static int make_idx_node(struct ubifs_info *c, struct ubifs_idx_node *idx,
struct ubifs_znode *znode, int lnum, int offs, int len)
{
struct ubifs_znode *zp;
u8 hash[UBIFS_HASH_ARR_SZ];
int i, err;
/* Make index node */
idx->ch.node_type = UBIFS_IDX_NODE;
idx->child_cnt = cpu_to_le16(znode->child_cnt);
idx->level = cpu_to_le16(znode->level);
for (i = 0; i < znode->child_cnt; i++) {
struct ubifs_branch *br = ubifs_idx_branch(c, idx, i);
struct ubifs_zbranch *zbr = &znode->zbranch[i];
key_write_idx(c, &zbr->key, &br->key);
br->lnum = cpu_to_le32(zbr->lnum);
br->offs = cpu_to_le32(zbr->offs);
br->len = cpu_to_le32(zbr->len);
ubifs_copy_hash(c, zbr->hash, ubifs_branch_hash(c, br));
if (!zbr->lnum || !zbr->len) {
UBIFS: extend debug/message capabilities In the case where we have more than one volumes on different UBI devices, it may be not that easy to tell which volume prints the messages. Add ubi number and volume id in ubifs_msg/warn/error to help debug. These two values are passed by struct ubifs_info. For those where ubifs_info is not initialized yet, ubifs_* is replaced by pr_*. For those where ubifs_info is not avaliable, ubifs_info is passed to the calling function as a const parameter. The output looks like, [ 95.444879] UBIFS (ubi0:1): background thread "ubifs_bgt0_1" started, PID 696 [ 95.484688] UBIFS (ubi0:1): UBIFS: mounted UBI device 0, volume 1, name "test1" [ 95.484694] UBIFS (ubi0:1): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.484699] UBIFS (ubi0:1): FS size: 30220288 bytes (28 MiB, 238 LEBs), journal size 1523712 bytes (1 MiB, 12 LEBs) [ 95.484703] UBIFS (ubi0:1): reserved for root: 1427378 bytes (1393 KiB) [ 95.484709] UBIFS (ubi0:1): media format: w4/r0 (latest is w4/r0), UUID 40DFFC0E-70BE-4193-8905-F7D6DFE60B17, small LPT model [ 95.489875] UBIFS (ubi1:0): background thread "ubifs_bgt1_0" started, PID 699 [ 95.529713] UBIFS (ubi1:0): UBIFS: mounted UBI device 1, volume 0, name "test2" [ 95.529718] UBIFS (ubi1:0): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.529724] UBIFS (ubi1:0): FS size: 19808256 bytes (18 MiB, 156 LEBs), journal size 1015809 bytes (0 MiB, 8 LEBs) [ 95.529727] UBIFS (ubi1:0): reserved for root: 935592 bytes (913 KiB) [ 95.529733] UBIFS (ubi1:0): media format: w4/r0 (latest is w4/r0), UUID EEB7779D-F419-4CA9-811B-831CAC7233D4, small LPT model [ 954.264767] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node type (255 but expected 6) [ 954.367030] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node at LEB 0:0, LEB mapping status 1 Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
2015-03-20 10:39:42 +00:00
ubifs_err(c, "bad ref in znode");
ubifs_dump_znode(c, znode);
if (zbr->znode)
ubifs_dump_znode(c, zbr->znode);
return -EINVAL;
}
}
ubifs_prepare_node(c, idx, len, 0);
ubifs_node_calc_hash(c, idx, hash);
znode->lnum = lnum;
znode->offs = offs;
znode->len = len;
err = insert_old_idx_znode(c, znode);
/* Update the parent */
zp = znode->parent;
if (zp) {
struct ubifs_zbranch *zbr;
zbr = &zp->zbranch[znode->iip];
zbr->lnum = lnum;
zbr->offs = offs;
zbr->len = len;
ubifs_copy_hash(c, hash, zbr->hash);
} else {
c->zroot.lnum = lnum;
c->zroot.offs = offs;
c->zroot.len = len;
ubifs_copy_hash(c, hash, c->zroot.hash);
}
c->calc_idx_sz += ALIGN(len, 8);
atomic_long_dec(&c->dirty_zn_cnt);
ubifs_assert(c, ubifs_zn_dirty(znode));
ubifs_assert(c, ubifs_zn_cow(znode));
/*
* Note, unlike 'write_index()' we do not add memory barriers here
* because this function is called with @c->tnc_mutex locked.
*/
__clear_bit(DIRTY_ZNODE, &znode->flags);
__clear_bit(COW_ZNODE, &znode->flags);
return err;
}
/**
* fill_gap - make index nodes in gaps in dirty index LEBs.
* @c: UBIFS file-system description object
* @lnum: LEB number that gap appears in
* @gap_start: offset of start of gap
* @gap_end: offset of end of gap
* @dirt: adds dirty space to this
*
* This function returns the number of index nodes written into the gap.
*/
static int fill_gap(struct ubifs_info *c, int lnum, int gap_start, int gap_end,
int *dirt)
{
int len, gap_remains, gap_pos, written, pad_len;
ubifs_assert(c, (gap_start & 7) == 0);
ubifs_assert(c, (gap_end & 7) == 0);
ubifs_assert(c, gap_end >= gap_start);
gap_remains = gap_end - gap_start;
if (!gap_remains)
return 0;
gap_pos = gap_start;
written = 0;
while (c->enext) {
len = ubifs_idx_node_sz(c, c->enext->child_cnt);
if (len < gap_remains) {
struct ubifs_znode *znode = c->enext;
const int alen = ALIGN(len, 8);
int err;
ubifs_assert(c, alen <= gap_remains);
err = make_idx_node(c, c->ileb_buf + gap_pos, znode,
lnum, gap_pos, len);
if (err)
return err;
gap_remains -= alen;
gap_pos += alen;
c->enext = znode->cnext;
if (c->enext == c->cnext)
c->enext = NULL;
written += 1;
} else
break;
}
if (gap_end == c->leb_size) {
c->ileb_len = ALIGN(gap_pos, c->min_io_size);
/* Pad to end of min_io_size */
pad_len = c->ileb_len - gap_pos;
} else
/* Pad to end of gap */
pad_len = gap_remains;
dbg_gc("LEB %d:%d to %d len %d nodes written %d wasted bytes %d",
lnum, gap_start, gap_end, gap_end - gap_start, written, pad_len);
ubifs_pad(c, c->ileb_buf + gap_pos, pad_len);
*dirt += pad_len;
return written;
}
/**
* find_old_idx - find an index node obsoleted since the last commit start.
* @c: UBIFS file-system description object
* @lnum: LEB number of obsoleted index node
* @offs: offset of obsoleted index node
*
* Returns %1 if found and %0 otherwise.
*/
static int find_old_idx(struct ubifs_info *c, int lnum, int offs)
{
struct ubifs_old_idx *o;
struct rb_node *p;
p = c->old_idx.rb_node;
while (p) {
o = rb_entry(p, struct ubifs_old_idx, rb);
if (lnum < o->lnum)
p = p->rb_left;
else if (lnum > o->lnum)
p = p->rb_right;
else if (offs < o->offs)
p = p->rb_left;
else if (offs > o->offs)
p = p->rb_right;
else
return 1;
}
return 0;
}
/**
* is_idx_node_in_use - determine if an index node can be overwritten.
* @c: UBIFS file-system description object
* @key: key of index node
* @level: index node level
* @lnum: LEB number of index node
* @offs: offset of index node
*
* If @key / @lnum / @offs identify an index node that was not part of the old
* index, then this function returns %0 (obsolete). Else if the index node was
* part of the old index but is now dirty %1 is returned, else if it is clean %2
* is returned. A negative error code is returned on failure.
*/
static int is_idx_node_in_use(struct ubifs_info *c, union ubifs_key *key,
int level, int lnum, int offs)
{
int ret;
ret = is_idx_node_in_tnc(c, key, level, lnum, offs);
if (ret < 0)
return ret; /* Error code */
if (ret == 0)
if (find_old_idx(c, lnum, offs))
return 1;
return ret;
}
/**
* layout_leb_in_gaps - layout index nodes using in-the-gaps method.
* @c: UBIFS file-system description object
ubifs: ubifs_tnc_start_commit: Fix OOB in layout_in_gaps Running stress-test test_2 in mtd-utils on ubi device, sometimes we can get following oops message: BUG: unable to handle page fault for address: ffffffff00000140 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 280a067 P4D 280a067 PUD 0 Oops: 0000 [#1] SMP CPU: 0 PID: 60 Comm: kworker/u16:1 Kdump: loaded Not tainted 5.2.0 #13 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0 -0-ga698c8995f-prebuilt.qemu.org 04/01/2014 Workqueue: writeback wb_workfn (flush-ubifs_0_0) RIP: 0010:rb_next_postorder+0x2e/0xb0 Code: 80 db 03 01 48 85 ff 0f 84 97 00 00 00 48 8b 17 48 83 05 bc 80 db 03 01 48 83 e2 fc 0f 84 82 00 00 00 48 83 05 b2 80 db 03 01 <48> 3b 7a 10 48 89 d0 74 02 f3 c3 48 8b 52 08 48 83 05 a3 80 db 03 RSP: 0018:ffffc90000887758 EFLAGS: 00010202 RAX: ffff888129ae4700 RBX: ffff888138b08400 RCX: 0000000080800001 RDX: ffffffff00000130 RSI: 0000000080800024 RDI: ffff888138b08400 RBP: ffff888138b08400 R08: ffffea0004a6b920 R09: 0000000000000000 R10: ffffc90000887740 R11: 0000000000000001 R12: ffff888128d48000 R13: 0000000000000800 R14: 000000000000011e R15: 00000000000007c8 FS: 0000000000000000(0000) GS:ffff88813ba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff00000140 CR3: 000000013789d000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: destroy_old_idx+0x5d/0xa0 [ubifs] ubifs_tnc_start_commit+0x4fe/0x1380 [ubifs] do_commit+0x3eb/0x830 [ubifs] ubifs_run_commit+0xdc/0x1c0 [ubifs] Above Oops are due to the slab-out-of-bounds happened in do-while of function layout_in_gaps indirectly called by ubifs_tnc_start_commit. In function layout_in_gaps, there is a do-while loop placing index nodes into the gaps created by obsolete index nodes in non-empty index LEBs until rest index nodes can totally be placed into pre-allocated empty LEBs. @c->gap_lebs points to a memory area(integer array) which records LEB numbers used by 'in-the-gaps' method. Whenever a fitable index LEB is found, corresponding lnum will be incrementally written into the memory area pointed by @c->gap_lebs. The size ((@c->lst.idx_lebs + 1) * sizeof(int)) of memory area is allocated before do-while loop and can not be changed in the loop. But @c->lst.idx_lebs could be increased by function ubifs_change_lp (called by layout_leb_in_gaps->ubifs_find_dirty_idx_leb->get_idx_gc_leb) during the loop. So, sometimes oob happens when number of cycles in do-while loop exceeds the original value of @c->lst.idx_lebs. See detail in https://bugzilla.kernel.org/show_bug.cgi?id=204229. This patch fixes oob in layout_in_gaps. Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2019-07-20 06:05:20 +00:00
* @p: return LEB number in @c->gap_lebs[p]
*
* This function lays out new index nodes for dirty znodes using in-the-gaps
* method of TNC commit.
* This function merely puts the next znode into the next gap, making no attempt
* to try to maximise the number of znodes that fit.
* This function returns the number of index nodes written into the gaps, or a
* negative error code on failure.
*/
ubifs: ubifs_tnc_start_commit: Fix OOB in layout_in_gaps Running stress-test test_2 in mtd-utils on ubi device, sometimes we can get following oops message: BUG: unable to handle page fault for address: ffffffff00000140 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 280a067 P4D 280a067 PUD 0 Oops: 0000 [#1] SMP CPU: 0 PID: 60 Comm: kworker/u16:1 Kdump: loaded Not tainted 5.2.0 #13 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0 -0-ga698c8995f-prebuilt.qemu.org 04/01/2014 Workqueue: writeback wb_workfn (flush-ubifs_0_0) RIP: 0010:rb_next_postorder+0x2e/0xb0 Code: 80 db 03 01 48 85 ff 0f 84 97 00 00 00 48 8b 17 48 83 05 bc 80 db 03 01 48 83 e2 fc 0f 84 82 00 00 00 48 83 05 b2 80 db 03 01 <48> 3b 7a 10 48 89 d0 74 02 f3 c3 48 8b 52 08 48 83 05 a3 80 db 03 RSP: 0018:ffffc90000887758 EFLAGS: 00010202 RAX: ffff888129ae4700 RBX: ffff888138b08400 RCX: 0000000080800001 RDX: ffffffff00000130 RSI: 0000000080800024 RDI: ffff888138b08400 RBP: ffff888138b08400 R08: ffffea0004a6b920 R09: 0000000000000000 R10: ffffc90000887740 R11: 0000000000000001 R12: ffff888128d48000 R13: 0000000000000800 R14: 000000000000011e R15: 00000000000007c8 FS: 0000000000000000(0000) GS:ffff88813ba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff00000140 CR3: 000000013789d000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: destroy_old_idx+0x5d/0xa0 [ubifs] ubifs_tnc_start_commit+0x4fe/0x1380 [ubifs] do_commit+0x3eb/0x830 [ubifs] ubifs_run_commit+0xdc/0x1c0 [ubifs] Above Oops are due to the slab-out-of-bounds happened in do-while of function layout_in_gaps indirectly called by ubifs_tnc_start_commit. In function layout_in_gaps, there is a do-while loop placing index nodes into the gaps created by obsolete index nodes in non-empty index LEBs until rest index nodes can totally be placed into pre-allocated empty LEBs. @c->gap_lebs points to a memory area(integer array) which records LEB numbers used by 'in-the-gaps' method. Whenever a fitable index LEB is found, corresponding lnum will be incrementally written into the memory area pointed by @c->gap_lebs. The size ((@c->lst.idx_lebs + 1) * sizeof(int)) of memory area is allocated before do-while loop and can not be changed in the loop. But @c->lst.idx_lebs could be increased by function ubifs_change_lp (called by layout_leb_in_gaps->ubifs_find_dirty_idx_leb->get_idx_gc_leb) during the loop. So, sometimes oob happens when number of cycles in do-while loop exceeds the original value of @c->lst.idx_lebs. See detail in https://bugzilla.kernel.org/show_bug.cgi?id=204229. This patch fixes oob in layout_in_gaps. Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2019-07-20 06:05:20 +00:00
static int layout_leb_in_gaps(struct ubifs_info *c, int p)
{
struct ubifs_scan_leb *sleb;
struct ubifs_scan_node *snod;
int lnum, dirt = 0, gap_start, gap_end, err, written, tot_written;
tot_written = 0;
/* Get an index LEB with lots of obsolete index nodes */
lnum = ubifs_find_dirty_idx_leb(c);
if (lnum < 0)
/*
* There also may be dirt in the index head that could be
* filled, however we do not check there at present.
*/
return lnum; /* Error code */
ubifs: ubifs_tnc_start_commit: Fix OOB in layout_in_gaps Running stress-test test_2 in mtd-utils on ubi device, sometimes we can get following oops message: BUG: unable to handle page fault for address: ffffffff00000140 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 280a067 P4D 280a067 PUD 0 Oops: 0000 [#1] SMP CPU: 0 PID: 60 Comm: kworker/u16:1 Kdump: loaded Not tainted 5.2.0 #13 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0 -0-ga698c8995f-prebuilt.qemu.org 04/01/2014 Workqueue: writeback wb_workfn (flush-ubifs_0_0) RIP: 0010:rb_next_postorder+0x2e/0xb0 Code: 80 db 03 01 48 85 ff 0f 84 97 00 00 00 48 8b 17 48 83 05 bc 80 db 03 01 48 83 e2 fc 0f 84 82 00 00 00 48 83 05 b2 80 db 03 01 <48> 3b 7a 10 48 89 d0 74 02 f3 c3 48 8b 52 08 48 83 05 a3 80 db 03 RSP: 0018:ffffc90000887758 EFLAGS: 00010202 RAX: ffff888129ae4700 RBX: ffff888138b08400 RCX: 0000000080800001 RDX: ffffffff00000130 RSI: 0000000080800024 RDI: ffff888138b08400 RBP: ffff888138b08400 R08: ffffea0004a6b920 R09: 0000000000000000 R10: ffffc90000887740 R11: 0000000000000001 R12: ffff888128d48000 R13: 0000000000000800 R14: 000000000000011e R15: 00000000000007c8 FS: 0000000000000000(0000) GS:ffff88813ba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff00000140 CR3: 000000013789d000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: destroy_old_idx+0x5d/0xa0 [ubifs] ubifs_tnc_start_commit+0x4fe/0x1380 [ubifs] do_commit+0x3eb/0x830 [ubifs] ubifs_run_commit+0xdc/0x1c0 [ubifs] Above Oops are due to the slab-out-of-bounds happened in do-while of function layout_in_gaps indirectly called by ubifs_tnc_start_commit. In function layout_in_gaps, there is a do-while loop placing index nodes into the gaps created by obsolete index nodes in non-empty index LEBs until rest index nodes can totally be placed into pre-allocated empty LEBs. @c->gap_lebs points to a memory area(integer array) which records LEB numbers used by 'in-the-gaps' method. Whenever a fitable index LEB is found, corresponding lnum will be incrementally written into the memory area pointed by @c->gap_lebs. The size ((@c->lst.idx_lebs + 1) * sizeof(int)) of memory area is allocated before do-while loop and can not be changed in the loop. But @c->lst.idx_lebs could be increased by function ubifs_change_lp (called by layout_leb_in_gaps->ubifs_find_dirty_idx_leb->get_idx_gc_leb) during the loop. So, sometimes oob happens when number of cycles in do-while loop exceeds the original value of @c->lst.idx_lebs. See detail in https://bugzilla.kernel.org/show_bug.cgi?id=204229. This patch fixes oob in layout_in_gaps. Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2019-07-20 06:05:20 +00:00
c->gap_lebs[p] = lnum;
dbg_gc("LEB %d", lnum);
/*
* Scan the index LEB. We use the generic scan for this even though
* it is more comprehensive and less efficient than is needed for this
* purpose.
*/
sleb = ubifs_scan(c, lnum, 0, c->ileb_buf, 0);
c->ileb_len = 0;
if (IS_ERR(sleb))
return PTR_ERR(sleb);
gap_start = 0;
list_for_each_entry(snod, &sleb->nodes, list) {
struct ubifs_idx_node *idx;
int in_use, level;
ubifs_assert(c, snod->type == UBIFS_IDX_NODE);
idx = snod->node;
key_read(c, ubifs_idx_key(c, idx), &snod->key);
level = le16_to_cpu(idx->level);
/* Determine if the index node is in use (not obsolete) */
in_use = is_idx_node_in_use(c, &snod->key, level, lnum,
snod->offs);
if (in_use < 0) {
ubifs_scan_destroy(sleb);
return in_use; /* Error code */
}
if (in_use) {
if (in_use == 1)
dirt += ALIGN(snod->len, 8);
/*
* The obsolete index nodes form gaps that can be
* overwritten. This gap has ended because we have
* found an index node that is still in use
* i.e. not obsolete
*/
gap_end = snod->offs;
/* Try to fill gap */
written = fill_gap(c, lnum, gap_start, gap_end, &dirt);
if (written < 0) {
ubifs_scan_destroy(sleb);
return written; /* Error code */
}
tot_written += written;
gap_start = ALIGN(snod->offs + snod->len, 8);
}
}
ubifs_scan_destroy(sleb);
c->ileb_len = c->leb_size;
gap_end = c->leb_size;
/* Try to fill gap */
written = fill_gap(c, lnum, gap_start, gap_end, &dirt);
if (written < 0)
return written; /* Error code */
tot_written += written;
if (tot_written == 0) {
struct ubifs_lprops lp;
dbg_gc("LEB %d wrote %d index nodes", lnum, tot_written);
err = ubifs_read_one_lp(c, lnum, &lp);
if (err)
return err;
if (lp.free == c->leb_size) {
/*
* We must have snatched this LEB from the idx_gc list
* so we need to correct the free and dirty space.
*/
err = ubifs_change_one_lp(c, lnum,
c->leb_size - c->ileb_len,
dirt, 0, 0, 0);
if (err)
return err;
}
return 0;
}
err = ubifs_change_one_lp(c, lnum, c->leb_size - c->ileb_len, dirt,
0, 0, 0);
if (err)
return err;
err = ubifs_leb_change(c, lnum, c->ileb_buf, c->ileb_len);
if (err)
return err;
dbg_gc("LEB %d wrote %d index nodes", lnum, tot_written);
return tot_written;
}
/**
* get_leb_cnt - calculate the number of empty LEBs needed to commit.
* @c: UBIFS file-system description object
* @cnt: number of znodes to commit
*
* This function returns the number of empty LEBs needed to commit @cnt znodes
* to the current index head. The number is not exact and may be more than
* needed.
*/
static int get_leb_cnt(struct ubifs_info *c, int cnt)
{
int d;
/* Assume maximum index node size (i.e. overestimate space needed) */
cnt -= (c->leb_size - c->ihead_offs) / c->max_idx_node_sz;
if (cnt < 0)
cnt = 0;
d = c->leb_size / c->max_idx_node_sz;
return DIV_ROUND_UP(cnt, d);
}
/**
* layout_in_gaps - in-the-gaps method of committing TNC.
* @c: UBIFS file-system description object
* @cnt: number of dirty znodes to commit.
*
* This function lays out new index nodes for dirty znodes using in-the-gaps
* method of TNC commit.
*
* This function returns %0 on success and a negative error code on failure.
*/
static int layout_in_gaps(struct ubifs_info *c, int cnt)
{
ubifs: ubifs_tnc_start_commit: Fix OOB in layout_in_gaps Running stress-test test_2 in mtd-utils on ubi device, sometimes we can get following oops message: BUG: unable to handle page fault for address: ffffffff00000140 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 280a067 P4D 280a067 PUD 0 Oops: 0000 [#1] SMP CPU: 0 PID: 60 Comm: kworker/u16:1 Kdump: loaded Not tainted 5.2.0 #13 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0 -0-ga698c8995f-prebuilt.qemu.org 04/01/2014 Workqueue: writeback wb_workfn (flush-ubifs_0_0) RIP: 0010:rb_next_postorder+0x2e/0xb0 Code: 80 db 03 01 48 85 ff 0f 84 97 00 00 00 48 8b 17 48 83 05 bc 80 db 03 01 48 83 e2 fc 0f 84 82 00 00 00 48 83 05 b2 80 db 03 01 <48> 3b 7a 10 48 89 d0 74 02 f3 c3 48 8b 52 08 48 83 05 a3 80 db 03 RSP: 0018:ffffc90000887758 EFLAGS: 00010202 RAX: ffff888129ae4700 RBX: ffff888138b08400 RCX: 0000000080800001 RDX: ffffffff00000130 RSI: 0000000080800024 RDI: ffff888138b08400 RBP: ffff888138b08400 R08: ffffea0004a6b920 R09: 0000000000000000 R10: ffffc90000887740 R11: 0000000000000001 R12: ffff888128d48000 R13: 0000000000000800 R14: 000000000000011e R15: 00000000000007c8 FS: 0000000000000000(0000) GS:ffff88813ba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff00000140 CR3: 000000013789d000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: destroy_old_idx+0x5d/0xa0 [ubifs] ubifs_tnc_start_commit+0x4fe/0x1380 [ubifs] do_commit+0x3eb/0x830 [ubifs] ubifs_run_commit+0xdc/0x1c0 [ubifs] Above Oops are due to the slab-out-of-bounds happened in do-while of function layout_in_gaps indirectly called by ubifs_tnc_start_commit. In function layout_in_gaps, there is a do-while loop placing index nodes into the gaps created by obsolete index nodes in non-empty index LEBs until rest index nodes can totally be placed into pre-allocated empty LEBs. @c->gap_lebs points to a memory area(integer array) which records LEB numbers used by 'in-the-gaps' method. Whenever a fitable index LEB is found, corresponding lnum will be incrementally written into the memory area pointed by @c->gap_lebs. The size ((@c->lst.idx_lebs + 1) * sizeof(int)) of memory area is allocated before do-while loop and can not be changed in the loop. But @c->lst.idx_lebs could be increased by function ubifs_change_lp (called by layout_leb_in_gaps->ubifs_find_dirty_idx_leb->get_idx_gc_leb) during the loop. So, sometimes oob happens when number of cycles in do-while loop exceeds the original value of @c->lst.idx_lebs. See detail in https://bugzilla.kernel.org/show_bug.cgi?id=204229. This patch fixes oob in layout_in_gaps. Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2019-07-20 06:05:20 +00:00
int err, leb_needed_cnt, written, p = 0, old_idx_lebs, *gap_lebs;
dbg_gc("%d znodes to write", cnt);
treewide: kmalloc() -> kmalloc_array() The kmalloc() function has a 2-factor argument form, kmalloc_array(). This patch replaces cases of: kmalloc(a * b, gfp) with: kmalloc_array(a * b, gfp) as well as handling cases of: kmalloc(a * b * c, gfp) with: kmalloc(array3_size(a, b, c), gfp) as it's slightly less ugly than: kmalloc_array(array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: kmalloc(4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. The tools/ directory was manually excluded, since it has its own implementation of kmalloc(). The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ type TYPE; expression THING, E; @@ ( kmalloc( - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | kmalloc( - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression COUNT; typedef u8; typedef __u8; @@ ( kmalloc( - sizeof(u8) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(__u8) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(char) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(unsigned char) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(u8) * COUNT + COUNT , ...) | kmalloc( - sizeof(__u8) * COUNT + COUNT , ...) | kmalloc( - sizeof(char) * COUNT + COUNT , ...) | kmalloc( - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - kmalloc + kmalloc_array ( - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ identifier SIZE, COUNT; @@ - kmalloc + kmalloc_array ( - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( kmalloc( - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( kmalloc( - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kmalloc( - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kmalloc( - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ identifier STRIDE, SIZE, COUNT; @@ ( kmalloc( - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression E1, E2, E3; constant C1, C2, C3; @@ ( kmalloc(C1 * C2 * C3, ...) | kmalloc( - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | kmalloc( - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | kmalloc( - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | kmalloc( - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( kmalloc(sizeof(THING) * C2, ...) | kmalloc(sizeof(TYPE) * C2, ...) | kmalloc(C1 * C2 * C3, ...) | kmalloc(C1 * C2, ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - (E1) * E2 + E1, E2 , ...) | - kmalloc + kmalloc_array ( - (E1) * (E2) + E1, E2 , ...) | - kmalloc + kmalloc_array ( - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 20:55:00 +00:00
c->gap_lebs = kmalloc_array(c->lst.idx_lebs + 1, sizeof(int),
GFP_NOFS);
if (!c->gap_lebs)
return -ENOMEM;
ubifs: ubifs_tnc_start_commit: Fix OOB in layout_in_gaps Running stress-test test_2 in mtd-utils on ubi device, sometimes we can get following oops message: BUG: unable to handle page fault for address: ffffffff00000140 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 280a067 P4D 280a067 PUD 0 Oops: 0000 [#1] SMP CPU: 0 PID: 60 Comm: kworker/u16:1 Kdump: loaded Not tainted 5.2.0 #13 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0 -0-ga698c8995f-prebuilt.qemu.org 04/01/2014 Workqueue: writeback wb_workfn (flush-ubifs_0_0) RIP: 0010:rb_next_postorder+0x2e/0xb0 Code: 80 db 03 01 48 85 ff 0f 84 97 00 00 00 48 8b 17 48 83 05 bc 80 db 03 01 48 83 e2 fc 0f 84 82 00 00 00 48 83 05 b2 80 db 03 01 <48> 3b 7a 10 48 89 d0 74 02 f3 c3 48 8b 52 08 48 83 05 a3 80 db 03 RSP: 0018:ffffc90000887758 EFLAGS: 00010202 RAX: ffff888129ae4700 RBX: ffff888138b08400 RCX: 0000000080800001 RDX: ffffffff00000130 RSI: 0000000080800024 RDI: ffff888138b08400 RBP: ffff888138b08400 R08: ffffea0004a6b920 R09: 0000000000000000 R10: ffffc90000887740 R11: 0000000000000001 R12: ffff888128d48000 R13: 0000000000000800 R14: 000000000000011e R15: 00000000000007c8 FS: 0000000000000000(0000) GS:ffff88813ba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff00000140 CR3: 000000013789d000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: destroy_old_idx+0x5d/0xa0 [ubifs] ubifs_tnc_start_commit+0x4fe/0x1380 [ubifs] do_commit+0x3eb/0x830 [ubifs] ubifs_run_commit+0xdc/0x1c0 [ubifs] Above Oops are due to the slab-out-of-bounds happened in do-while of function layout_in_gaps indirectly called by ubifs_tnc_start_commit. In function layout_in_gaps, there is a do-while loop placing index nodes into the gaps created by obsolete index nodes in non-empty index LEBs until rest index nodes can totally be placed into pre-allocated empty LEBs. @c->gap_lebs points to a memory area(integer array) which records LEB numbers used by 'in-the-gaps' method. Whenever a fitable index LEB is found, corresponding lnum will be incrementally written into the memory area pointed by @c->gap_lebs. The size ((@c->lst.idx_lebs + 1) * sizeof(int)) of memory area is allocated before do-while loop and can not be changed in the loop. But @c->lst.idx_lebs could be increased by function ubifs_change_lp (called by layout_leb_in_gaps->ubifs_find_dirty_idx_leb->get_idx_gc_leb) during the loop. So, sometimes oob happens when number of cycles in do-while loop exceeds the original value of @c->lst.idx_lebs. See detail in https://bugzilla.kernel.org/show_bug.cgi?id=204229. This patch fixes oob in layout_in_gaps. Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2019-07-20 06:05:20 +00:00
old_idx_lebs = c->lst.idx_lebs;
do {
ubifs: ubifs_tnc_start_commit: Fix OOB in layout_in_gaps Running stress-test test_2 in mtd-utils on ubi device, sometimes we can get following oops message: BUG: unable to handle page fault for address: ffffffff00000140 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 280a067 P4D 280a067 PUD 0 Oops: 0000 [#1] SMP CPU: 0 PID: 60 Comm: kworker/u16:1 Kdump: loaded Not tainted 5.2.0 #13 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0 -0-ga698c8995f-prebuilt.qemu.org 04/01/2014 Workqueue: writeback wb_workfn (flush-ubifs_0_0) RIP: 0010:rb_next_postorder+0x2e/0xb0 Code: 80 db 03 01 48 85 ff 0f 84 97 00 00 00 48 8b 17 48 83 05 bc 80 db 03 01 48 83 e2 fc 0f 84 82 00 00 00 48 83 05 b2 80 db 03 01 <48> 3b 7a 10 48 89 d0 74 02 f3 c3 48 8b 52 08 48 83 05 a3 80 db 03 RSP: 0018:ffffc90000887758 EFLAGS: 00010202 RAX: ffff888129ae4700 RBX: ffff888138b08400 RCX: 0000000080800001 RDX: ffffffff00000130 RSI: 0000000080800024 RDI: ffff888138b08400 RBP: ffff888138b08400 R08: ffffea0004a6b920 R09: 0000000000000000 R10: ffffc90000887740 R11: 0000000000000001 R12: ffff888128d48000 R13: 0000000000000800 R14: 000000000000011e R15: 00000000000007c8 FS: 0000000000000000(0000) GS:ffff88813ba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff00000140 CR3: 000000013789d000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: destroy_old_idx+0x5d/0xa0 [ubifs] ubifs_tnc_start_commit+0x4fe/0x1380 [ubifs] do_commit+0x3eb/0x830 [ubifs] ubifs_run_commit+0xdc/0x1c0 [ubifs] Above Oops are due to the slab-out-of-bounds happened in do-while of function layout_in_gaps indirectly called by ubifs_tnc_start_commit. In function layout_in_gaps, there is a do-while loop placing index nodes into the gaps created by obsolete index nodes in non-empty index LEBs until rest index nodes can totally be placed into pre-allocated empty LEBs. @c->gap_lebs points to a memory area(integer array) which records LEB numbers used by 'in-the-gaps' method. Whenever a fitable index LEB is found, corresponding lnum will be incrementally written into the memory area pointed by @c->gap_lebs. The size ((@c->lst.idx_lebs + 1) * sizeof(int)) of memory area is allocated before do-while loop and can not be changed in the loop. But @c->lst.idx_lebs could be increased by function ubifs_change_lp (called by layout_leb_in_gaps->ubifs_find_dirty_idx_leb->get_idx_gc_leb) during the loop. So, sometimes oob happens when number of cycles in do-while loop exceeds the original value of @c->lst.idx_lebs. See detail in https://bugzilla.kernel.org/show_bug.cgi?id=204229. This patch fixes oob in layout_in_gaps. Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2019-07-20 06:05:20 +00:00
ubifs_assert(c, p < c->lst.idx_lebs);
written = layout_leb_in_gaps(c, p);
if (written < 0) {
err = written;
if (err != -ENOSPC) {
kfree(c->gap_lebs);
c->gap_lebs = NULL;
return err;
}
if (!dbg_is_chk_index(c)) {
/*
* Do not print scary warnings if the debugging
* option which forces in-the-gaps is enabled.
*/
UBIFS: extend debug/message capabilities In the case where we have more than one volumes on different UBI devices, it may be not that easy to tell which volume prints the messages. Add ubi number and volume id in ubifs_msg/warn/error to help debug. These two values are passed by struct ubifs_info. For those where ubifs_info is not initialized yet, ubifs_* is replaced by pr_*. For those where ubifs_info is not avaliable, ubifs_info is passed to the calling function as a const parameter. The output looks like, [ 95.444879] UBIFS (ubi0:1): background thread "ubifs_bgt0_1" started, PID 696 [ 95.484688] UBIFS (ubi0:1): UBIFS: mounted UBI device 0, volume 1, name "test1" [ 95.484694] UBIFS (ubi0:1): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.484699] UBIFS (ubi0:1): FS size: 30220288 bytes (28 MiB, 238 LEBs), journal size 1523712 bytes (1 MiB, 12 LEBs) [ 95.484703] UBIFS (ubi0:1): reserved for root: 1427378 bytes (1393 KiB) [ 95.484709] UBIFS (ubi0:1): media format: w4/r0 (latest is w4/r0), UUID 40DFFC0E-70BE-4193-8905-F7D6DFE60B17, small LPT model [ 95.489875] UBIFS (ubi1:0): background thread "ubifs_bgt1_0" started, PID 699 [ 95.529713] UBIFS (ubi1:0): UBIFS: mounted UBI device 1, volume 0, name "test2" [ 95.529718] UBIFS (ubi1:0): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.529724] UBIFS (ubi1:0): FS size: 19808256 bytes (18 MiB, 156 LEBs), journal size 1015809 bytes (0 MiB, 8 LEBs) [ 95.529727] UBIFS (ubi1:0): reserved for root: 935592 bytes (913 KiB) [ 95.529733] UBIFS (ubi1:0): media format: w4/r0 (latest is w4/r0), UUID EEB7779D-F419-4CA9-811B-831CAC7233D4, small LPT model [ 954.264767] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node type (255 but expected 6) [ 954.367030] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node at LEB 0:0, LEB mapping status 1 Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
2015-03-20 10:39:42 +00:00
ubifs_warn(c, "out of space");
ubifs_dump_budg(c, &c->bi);
ubifs_dump_lprops(c);
}
/* Try to commit anyway */
break;
}
p++;
cnt -= written;
leb_needed_cnt = get_leb_cnt(c, cnt);
dbg_gc("%d znodes remaining, need %d LEBs, have %d", cnt,
leb_needed_cnt, c->ileb_cnt);
ubifs: ubifs_tnc_start_commit: Fix OOB in layout_in_gaps Running stress-test test_2 in mtd-utils on ubi device, sometimes we can get following oops message: BUG: unable to handle page fault for address: ffffffff00000140 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 280a067 P4D 280a067 PUD 0 Oops: 0000 [#1] SMP CPU: 0 PID: 60 Comm: kworker/u16:1 Kdump: loaded Not tainted 5.2.0 #13 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0 -0-ga698c8995f-prebuilt.qemu.org 04/01/2014 Workqueue: writeback wb_workfn (flush-ubifs_0_0) RIP: 0010:rb_next_postorder+0x2e/0xb0 Code: 80 db 03 01 48 85 ff 0f 84 97 00 00 00 48 8b 17 48 83 05 bc 80 db 03 01 48 83 e2 fc 0f 84 82 00 00 00 48 83 05 b2 80 db 03 01 <48> 3b 7a 10 48 89 d0 74 02 f3 c3 48 8b 52 08 48 83 05 a3 80 db 03 RSP: 0018:ffffc90000887758 EFLAGS: 00010202 RAX: ffff888129ae4700 RBX: ffff888138b08400 RCX: 0000000080800001 RDX: ffffffff00000130 RSI: 0000000080800024 RDI: ffff888138b08400 RBP: ffff888138b08400 R08: ffffea0004a6b920 R09: 0000000000000000 R10: ffffc90000887740 R11: 0000000000000001 R12: ffff888128d48000 R13: 0000000000000800 R14: 000000000000011e R15: 00000000000007c8 FS: 0000000000000000(0000) GS:ffff88813ba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff00000140 CR3: 000000013789d000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: destroy_old_idx+0x5d/0xa0 [ubifs] ubifs_tnc_start_commit+0x4fe/0x1380 [ubifs] do_commit+0x3eb/0x830 [ubifs] ubifs_run_commit+0xdc/0x1c0 [ubifs] Above Oops are due to the slab-out-of-bounds happened in do-while of function layout_in_gaps indirectly called by ubifs_tnc_start_commit. In function layout_in_gaps, there is a do-while loop placing index nodes into the gaps created by obsolete index nodes in non-empty index LEBs until rest index nodes can totally be placed into pre-allocated empty LEBs. @c->gap_lebs points to a memory area(integer array) which records LEB numbers used by 'in-the-gaps' method. Whenever a fitable index LEB is found, corresponding lnum will be incrementally written into the memory area pointed by @c->gap_lebs. The size ((@c->lst.idx_lebs + 1) * sizeof(int)) of memory area is allocated before do-while loop and can not be changed in the loop. But @c->lst.idx_lebs could be increased by function ubifs_change_lp (called by layout_leb_in_gaps->ubifs_find_dirty_idx_leb->get_idx_gc_leb) during the loop. So, sometimes oob happens when number of cycles in do-while loop exceeds the original value of @c->lst.idx_lebs. See detail in https://bugzilla.kernel.org/show_bug.cgi?id=204229. This patch fixes oob in layout_in_gaps. Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2019-07-20 06:05:20 +00:00
/*
* Dynamically change the size of @c->gap_lebs to prevent
* oob, because @c->lst.idx_lebs could be increased by
* function @get_idx_gc_leb (called by layout_leb_in_gaps->
* ubifs_find_dirty_idx_leb) during loop. Only enlarge
* @c->gap_lebs when needed.
*
*/
if (leb_needed_cnt > c->ileb_cnt && p >= old_idx_lebs &&
old_idx_lebs < c->lst.idx_lebs) {
old_idx_lebs = c->lst.idx_lebs;
gap_lebs = krealloc(c->gap_lebs, sizeof(int) *
(old_idx_lebs + 1), GFP_NOFS);
if (!gap_lebs) {
kfree(c->gap_lebs);
c->gap_lebs = NULL;
return -ENOMEM;
}
c->gap_lebs = gap_lebs;
}
} while (leb_needed_cnt > c->ileb_cnt);
ubifs: ubifs_tnc_start_commit: Fix OOB in layout_in_gaps Running stress-test test_2 in mtd-utils on ubi device, sometimes we can get following oops message: BUG: unable to handle page fault for address: ffffffff00000140 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 280a067 P4D 280a067 PUD 0 Oops: 0000 [#1] SMP CPU: 0 PID: 60 Comm: kworker/u16:1 Kdump: loaded Not tainted 5.2.0 #13 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0 -0-ga698c8995f-prebuilt.qemu.org 04/01/2014 Workqueue: writeback wb_workfn (flush-ubifs_0_0) RIP: 0010:rb_next_postorder+0x2e/0xb0 Code: 80 db 03 01 48 85 ff 0f 84 97 00 00 00 48 8b 17 48 83 05 bc 80 db 03 01 48 83 e2 fc 0f 84 82 00 00 00 48 83 05 b2 80 db 03 01 <48> 3b 7a 10 48 89 d0 74 02 f3 c3 48 8b 52 08 48 83 05 a3 80 db 03 RSP: 0018:ffffc90000887758 EFLAGS: 00010202 RAX: ffff888129ae4700 RBX: ffff888138b08400 RCX: 0000000080800001 RDX: ffffffff00000130 RSI: 0000000080800024 RDI: ffff888138b08400 RBP: ffff888138b08400 R08: ffffea0004a6b920 R09: 0000000000000000 R10: ffffc90000887740 R11: 0000000000000001 R12: ffff888128d48000 R13: 0000000000000800 R14: 000000000000011e R15: 00000000000007c8 FS: 0000000000000000(0000) GS:ffff88813ba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff00000140 CR3: 000000013789d000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: destroy_old_idx+0x5d/0xa0 [ubifs] ubifs_tnc_start_commit+0x4fe/0x1380 [ubifs] do_commit+0x3eb/0x830 [ubifs] ubifs_run_commit+0xdc/0x1c0 [ubifs] Above Oops are due to the slab-out-of-bounds happened in do-while of function layout_in_gaps indirectly called by ubifs_tnc_start_commit. In function layout_in_gaps, there is a do-while loop placing index nodes into the gaps created by obsolete index nodes in non-empty index LEBs until rest index nodes can totally be placed into pre-allocated empty LEBs. @c->gap_lebs points to a memory area(integer array) which records LEB numbers used by 'in-the-gaps' method. Whenever a fitable index LEB is found, corresponding lnum will be incrementally written into the memory area pointed by @c->gap_lebs. The size ((@c->lst.idx_lebs + 1) * sizeof(int)) of memory area is allocated before do-while loop and can not be changed in the loop. But @c->lst.idx_lebs could be increased by function ubifs_change_lp (called by layout_leb_in_gaps->ubifs_find_dirty_idx_leb->get_idx_gc_leb) during the loop. So, sometimes oob happens when number of cycles in do-while loop exceeds the original value of @c->lst.idx_lebs. See detail in https://bugzilla.kernel.org/show_bug.cgi?id=204229. This patch fixes oob in layout_in_gaps. Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2019-07-20 06:05:20 +00:00
c->gap_lebs[p] = -1;
return 0;
}
/**
* layout_in_empty_space - layout index nodes in empty space.
* @c: UBIFS file-system description object
*
* This function lays out new index nodes for dirty znodes using empty LEBs.
*
* This function returns %0 on success and a negative error code on failure.
*/
static int layout_in_empty_space(struct ubifs_info *c)
{
struct ubifs_znode *znode, *cnext, *zp;
int lnum, offs, len, next_len, buf_len, buf_offs, used, avail;
int wlen, blen, err;
cnext = c->enext;
if (!cnext)
return 0;
lnum = c->ihead_lnum;
buf_offs = c->ihead_offs;
buf_len = ubifs_idx_node_sz(c, c->fanout);
buf_len = ALIGN(buf_len, c->min_io_size);
used = 0;
avail = buf_len;
/* Ensure there is enough room for first write */
next_len = ubifs_idx_node_sz(c, cnext->child_cnt);
if (buf_offs + next_len > c->leb_size)
lnum = -1;
while (1) {
znode = cnext;
len = ubifs_idx_node_sz(c, znode->child_cnt);
/* Determine the index node position */
if (lnum == -1) {
if (c->ileb_nxt >= c->ileb_cnt) {
UBIFS: extend debug/message capabilities In the case where we have more than one volumes on different UBI devices, it may be not that easy to tell which volume prints the messages. Add ubi number and volume id in ubifs_msg/warn/error to help debug. These two values are passed by struct ubifs_info. For those where ubifs_info is not initialized yet, ubifs_* is replaced by pr_*. For those where ubifs_info is not avaliable, ubifs_info is passed to the calling function as a const parameter. The output looks like, [ 95.444879] UBIFS (ubi0:1): background thread "ubifs_bgt0_1" started, PID 696 [ 95.484688] UBIFS (ubi0:1): UBIFS: mounted UBI device 0, volume 1, name "test1" [ 95.484694] UBIFS (ubi0:1): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.484699] UBIFS (ubi0:1): FS size: 30220288 bytes (28 MiB, 238 LEBs), journal size 1523712 bytes (1 MiB, 12 LEBs) [ 95.484703] UBIFS (ubi0:1): reserved for root: 1427378 bytes (1393 KiB) [ 95.484709] UBIFS (ubi0:1): media format: w4/r0 (latest is w4/r0), UUID 40DFFC0E-70BE-4193-8905-F7D6DFE60B17, small LPT model [ 95.489875] UBIFS (ubi1:0): background thread "ubifs_bgt1_0" started, PID 699 [ 95.529713] UBIFS (ubi1:0): UBIFS: mounted UBI device 1, volume 0, name "test2" [ 95.529718] UBIFS (ubi1:0): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.529724] UBIFS (ubi1:0): FS size: 19808256 bytes (18 MiB, 156 LEBs), journal size 1015809 bytes (0 MiB, 8 LEBs) [ 95.529727] UBIFS (ubi1:0): reserved for root: 935592 bytes (913 KiB) [ 95.529733] UBIFS (ubi1:0): media format: w4/r0 (latest is w4/r0), UUID EEB7779D-F419-4CA9-811B-831CAC7233D4, small LPT model [ 954.264767] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node type (255 but expected 6) [ 954.367030] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node at LEB 0:0, LEB mapping status 1 Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
2015-03-20 10:39:42 +00:00
ubifs_err(c, "out of space");
return -ENOSPC;
}
lnum = c->ilebs[c->ileb_nxt++];
buf_offs = 0;
used = 0;
avail = buf_len;
}
offs = buf_offs + used;
znode->lnum = lnum;
znode->offs = offs;
znode->len = len;
/* Update the parent */
zp = znode->parent;
if (zp) {
struct ubifs_zbranch *zbr;
int i;
i = znode->iip;
zbr = &zp->zbranch[i];
zbr->lnum = lnum;
zbr->offs = offs;
zbr->len = len;
} else {
c->zroot.lnum = lnum;
c->zroot.offs = offs;
c->zroot.len = len;
}
c->calc_idx_sz += ALIGN(len, 8);
/*
* Once lprops is updated, we can decrease the dirty znode count
* but it is easier to just do it here.
*/
atomic_long_dec(&c->dirty_zn_cnt);
/*
* Calculate the next index node length to see if there is
* enough room for it
*/
cnext = znode->cnext;
if (cnext == c->cnext)
next_len = 0;
else
next_len = ubifs_idx_node_sz(c, cnext->child_cnt);
/* Update buffer positions */
wlen = used + len;
used += ALIGN(len, 8);
avail -= ALIGN(len, 8);
if (next_len != 0 &&
buf_offs + used + next_len <= c->leb_size &&
avail > 0)
continue;
if (avail <= 0 && next_len &&
buf_offs + used + next_len <= c->leb_size)
blen = buf_len;
else
blen = ALIGN(wlen, c->min_io_size);
/* The buffer is full or there are no more znodes to do */
buf_offs += blen;
if (next_len) {
if (buf_offs + next_len > c->leb_size) {
err = ubifs_update_one_lp(c, lnum,
c->leb_size - buf_offs, blen - used,
0, 0);
if (err)
return err;
lnum = -1;
}
used -= blen;
if (used < 0)
used = 0;
avail = buf_len - used;
continue;
}
err = ubifs_update_one_lp(c, lnum, c->leb_size - buf_offs,
blen - used, 0, 0);
if (err)
return err;
break;
}
c->dbg->new_ihead_lnum = lnum;
c->dbg->new_ihead_offs = buf_offs;
return 0;
}
/**
* layout_commit - determine positions of index nodes to commit.
* @c: UBIFS file-system description object
* @no_space: indicates that insufficient empty LEBs were allocated
* @cnt: number of znodes to commit
*
* Calculate and update the positions of index nodes to commit. If there were
* an insufficient number of empty LEBs allocated, then index nodes are placed
* into the gaps created by obsolete index nodes in non-empty index LEBs. For
* this purpose, an obsolete index node is one that was not in the index as at
* the end of the last commit. To write "in-the-gaps" requires that those index
* LEBs are updated atomically in-place.
*/
static int layout_commit(struct ubifs_info *c, int no_space, int cnt)
{
int err;
if (no_space) {
err = layout_in_gaps(c, cnt);
if (err)
return err;
}
err = layout_in_empty_space(c);
return err;
}
/**
* find_first_dirty - find first dirty znode.
* @znode: znode to begin searching from
*/
static struct ubifs_znode *find_first_dirty(struct ubifs_znode *znode)
{
int i, cont;
if (!znode)
return NULL;
while (1) {
if (znode->level == 0) {
if (ubifs_zn_dirty(znode))
return znode;
return NULL;
}
cont = 0;
for (i = 0; i < znode->child_cnt; i++) {
struct ubifs_zbranch *zbr = &znode->zbranch[i];
if (zbr->znode && ubifs_zn_dirty(zbr->znode)) {
znode = zbr->znode;
cont = 1;
break;
}
}
if (!cont) {
if (ubifs_zn_dirty(znode))
return znode;
return NULL;
}
}
}
/**
* find_next_dirty - find next dirty znode.
* @znode: znode to begin searching from
*/
static struct ubifs_znode *find_next_dirty(struct ubifs_znode *znode)
{
int n = znode->iip + 1;
znode = znode->parent;
if (!znode)
return NULL;
for (; n < znode->child_cnt; n++) {
struct ubifs_zbranch *zbr = &znode->zbranch[n];
if (zbr->znode && ubifs_zn_dirty(zbr->znode))
return find_first_dirty(zbr->znode);
}
return znode;
}
/**
* get_znodes_to_commit - create list of dirty znodes to commit.
* @c: UBIFS file-system description object
*
* This function returns the number of znodes to commit.
*/
static int get_znodes_to_commit(struct ubifs_info *c)
{
struct ubifs_znode *znode, *cnext;
int cnt = 0;
c->cnext = find_first_dirty(c->zroot.znode);
znode = c->enext = c->cnext;
if (!znode) {
dbg_cmt("no znodes to commit");
return 0;
}
cnt += 1;
while (1) {
ubifs_assert(c, !ubifs_zn_cow(znode));
__set_bit(COW_ZNODE, &znode->flags);
znode->alt = 0;
cnext = find_next_dirty(znode);
if (!cnext) {
znode->cnext = c->cnext;
break;
}
znode->cparent = znode->parent;
znode->ciip = znode->iip;
znode->cnext = cnext;
znode = cnext;
cnt += 1;
}
dbg_cmt("committing %d znodes", cnt);
ubifs_assert(c, cnt == atomic_long_read(&c->dirty_zn_cnt));
return cnt;
}
/**
* alloc_idx_lebs - allocate empty LEBs to be used to commit.
* @c: UBIFS file-system description object
* @cnt: number of znodes to commit
*
* This function returns %-ENOSPC if it cannot allocate a sufficient number of
* empty LEBs. %0 is returned on success, otherwise a negative error code
* is returned.
*/
static int alloc_idx_lebs(struct ubifs_info *c, int cnt)
{
int i, leb_cnt, lnum;
c->ileb_cnt = 0;
c->ileb_nxt = 0;
leb_cnt = get_leb_cnt(c, cnt);
dbg_cmt("need about %d empty LEBS for TNC commit", leb_cnt);
if (!leb_cnt)
return 0;
treewide: kmalloc() -> kmalloc_array() The kmalloc() function has a 2-factor argument form, kmalloc_array(). This patch replaces cases of: kmalloc(a * b, gfp) with: kmalloc_array(a * b, gfp) as well as handling cases of: kmalloc(a * b * c, gfp) with: kmalloc(array3_size(a, b, c), gfp) as it's slightly less ugly than: kmalloc_array(array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: kmalloc(4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. The tools/ directory was manually excluded, since it has its own implementation of kmalloc(). The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ type TYPE; expression THING, E; @@ ( kmalloc( - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | kmalloc( - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression COUNT; typedef u8; typedef __u8; @@ ( kmalloc( - sizeof(u8) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(__u8) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(char) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(unsigned char) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(u8) * COUNT + COUNT , ...) | kmalloc( - sizeof(__u8) * COUNT + COUNT , ...) | kmalloc( - sizeof(char) * COUNT + COUNT , ...) | kmalloc( - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - kmalloc + kmalloc_array ( - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ identifier SIZE, COUNT; @@ - kmalloc + kmalloc_array ( - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( kmalloc( - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( kmalloc( - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kmalloc( - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kmalloc( - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ identifier STRIDE, SIZE, COUNT; @@ ( kmalloc( - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression E1, E2, E3; constant C1, C2, C3; @@ ( kmalloc(C1 * C2 * C3, ...) | kmalloc( - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | kmalloc( - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | kmalloc( - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | kmalloc( - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( kmalloc(sizeof(THING) * C2, ...) | kmalloc(sizeof(TYPE) * C2, ...) | kmalloc(C1 * C2 * C3, ...) | kmalloc(C1 * C2, ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - (E1) * E2 + E1, E2 , ...) | - kmalloc + kmalloc_array ( - (E1) * (E2) + E1, E2 , ...) | - kmalloc + kmalloc_array ( - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 20:55:00 +00:00
c->ilebs = kmalloc_array(leb_cnt, sizeof(int), GFP_NOFS);
if (!c->ilebs)
return -ENOMEM;
for (i = 0; i < leb_cnt; i++) {
lnum = ubifs_find_free_leb_for_idx(c);
if (lnum < 0)
return lnum;
c->ilebs[c->ileb_cnt++] = lnum;
dbg_cmt("LEB %d", lnum);
}
if (dbg_is_chk_index(c) && !(prandom_u32() & 7))
return -ENOSPC;
return 0;
}
/**
* free_unused_idx_lebs - free unused LEBs that were allocated for the commit.
* @c: UBIFS file-system description object
*
* It is possible that we allocate more empty LEBs for the commit than we need.
* This functions frees the surplus.
*
* This function returns %0 on success and a negative error code on failure.
*/
static int free_unused_idx_lebs(struct ubifs_info *c)
{
int i, err = 0, lnum, er;
for (i = c->ileb_nxt; i < c->ileb_cnt; i++) {
lnum = c->ilebs[i];
dbg_cmt("LEB %d", lnum);
er = ubifs_change_one_lp(c, lnum, LPROPS_NC, LPROPS_NC, 0,
LPROPS_INDEX | LPROPS_TAKEN, 0);
if (!err)
err = er;
}
return err;
}
/**
* free_idx_lebs - free unused LEBs after commit end.
* @c: UBIFS file-system description object
*
* This function returns %0 on success and a negative error code on failure.
*/
static int free_idx_lebs(struct ubifs_info *c)
{
int err;
err = free_unused_idx_lebs(c);
kfree(c->ilebs);
c->ilebs = NULL;
return err;
}
/**
* ubifs_tnc_start_commit - start TNC commit.
* @c: UBIFS file-system description object
* @zroot: new index root position is returned here
*
* This function prepares the list of indexing nodes to commit and lays out
* their positions on flash. If there is not enough free space it uses the
* in-gap commit method. Returns zero in case of success and a negative error
* code in case of failure.
*/
int ubifs_tnc_start_commit(struct ubifs_info *c, struct ubifs_zbranch *zroot)
{
int err = 0, cnt;
mutex_lock(&c->tnc_mutex);
err = dbg_check_tnc(c, 1);
if (err)
goto out;
cnt = get_znodes_to_commit(c);
if (cnt != 0) {
int no_space = 0;
err = alloc_idx_lebs(c, cnt);
if (err == -ENOSPC)
no_space = 1;
else if (err)
goto out_free;
err = layout_commit(c, no_space, cnt);
if (err)
goto out_free;
ubifs_assert(c, atomic_long_read(&c->dirty_zn_cnt) == 0);
err = free_unused_idx_lebs(c);
if (err)
goto out;
}
destroy_old_idx(c);
memcpy(zroot, &c->zroot, sizeof(struct ubifs_zbranch));
err = ubifs_save_dirty_idx_lnums(c);
if (err)
goto out;
spin_lock(&c->space_lock);
/*
* Although we have not finished committing yet, update size of the
* committed index ('c->bi.old_idx_sz') and zero out the index growth
* budget. It is OK to do this now, because we've reserved all the
* space which is needed to commit the index, and it is save for the
* budgeting subsystem to assume the index is already committed,
* even though it is not.
*/
ubifs_assert(c, c->bi.min_idx_lebs == ubifs_calc_min_idx_lebs(c));
c->bi.old_idx_sz = c->calc_idx_sz;
c->bi.uncommitted_idx = 0;
c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
spin_unlock(&c->space_lock);
mutex_unlock(&c->tnc_mutex);
dbg_cmt("number of index LEBs %d", c->lst.idx_lebs);
dbg_cmt("size of index %llu", c->calc_idx_sz);
return err;
out_free:
free_idx_lebs(c);
out:
mutex_unlock(&c->tnc_mutex);
return err;
}
/**
* write_index - write index nodes.
* @c: UBIFS file-system description object
*
* This function writes the index nodes whose positions were laid out in the
* layout_in_empty_space function.
*/
static int write_index(struct ubifs_info *c)
{
struct ubifs_idx_node *idx;
struct ubifs_znode *znode, *cnext;
int i, lnum, offs, len, next_len, buf_len, buf_offs, used;
int avail, wlen, err, lnum_pos = 0, blen, nxt_offs;
cnext = c->enext;
if (!cnext)
return 0;
/*
* Always write index nodes to the index head so that index nodes and
* other types of nodes are never mixed in the same erase block.
*/
lnum = c->ihead_lnum;
buf_offs = c->ihead_offs;
/* Allocate commit buffer */
buf_len = ALIGN(c->max_idx_node_sz, c->min_io_size);
used = 0;
avail = buf_len;
/* Ensure there is enough room for first write */
next_len = ubifs_idx_node_sz(c, cnext->child_cnt);
if (buf_offs + next_len > c->leb_size) {
err = ubifs_update_one_lp(c, lnum, LPROPS_NC, 0, 0,
LPROPS_TAKEN);
if (err)
return err;
lnum = -1;
}
while (1) {
u8 hash[UBIFS_HASH_ARR_SZ];
cond_resched();
znode = cnext;
idx = c->cbuf + used;
/* Make index node */
idx->ch.node_type = UBIFS_IDX_NODE;
idx->child_cnt = cpu_to_le16(znode->child_cnt);
idx->level = cpu_to_le16(znode->level);
for (i = 0; i < znode->child_cnt; i++) {
struct ubifs_branch *br = ubifs_idx_branch(c, idx, i);
struct ubifs_zbranch *zbr = &znode->zbranch[i];
key_write_idx(c, &zbr->key, &br->key);
br->lnum = cpu_to_le32(zbr->lnum);
br->offs = cpu_to_le32(zbr->offs);
br->len = cpu_to_le32(zbr->len);
ubifs_copy_hash(c, zbr->hash, ubifs_branch_hash(c, br));
if (!zbr->lnum || !zbr->len) {
UBIFS: extend debug/message capabilities In the case where we have more than one volumes on different UBI devices, it may be not that easy to tell which volume prints the messages. Add ubi number and volume id in ubifs_msg/warn/error to help debug. These two values are passed by struct ubifs_info. For those where ubifs_info is not initialized yet, ubifs_* is replaced by pr_*. For those where ubifs_info is not avaliable, ubifs_info is passed to the calling function as a const parameter. The output looks like, [ 95.444879] UBIFS (ubi0:1): background thread "ubifs_bgt0_1" started, PID 696 [ 95.484688] UBIFS (ubi0:1): UBIFS: mounted UBI device 0, volume 1, name "test1" [ 95.484694] UBIFS (ubi0:1): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.484699] UBIFS (ubi0:1): FS size: 30220288 bytes (28 MiB, 238 LEBs), journal size 1523712 bytes (1 MiB, 12 LEBs) [ 95.484703] UBIFS (ubi0:1): reserved for root: 1427378 bytes (1393 KiB) [ 95.484709] UBIFS (ubi0:1): media format: w4/r0 (latest is w4/r0), UUID 40DFFC0E-70BE-4193-8905-F7D6DFE60B17, small LPT model [ 95.489875] UBIFS (ubi1:0): background thread "ubifs_bgt1_0" started, PID 699 [ 95.529713] UBIFS (ubi1:0): UBIFS: mounted UBI device 1, volume 0, name "test2" [ 95.529718] UBIFS (ubi1:0): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.529724] UBIFS (ubi1:0): FS size: 19808256 bytes (18 MiB, 156 LEBs), journal size 1015809 bytes (0 MiB, 8 LEBs) [ 95.529727] UBIFS (ubi1:0): reserved for root: 935592 bytes (913 KiB) [ 95.529733] UBIFS (ubi1:0): media format: w4/r0 (latest is w4/r0), UUID EEB7779D-F419-4CA9-811B-831CAC7233D4, small LPT model [ 954.264767] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node type (255 but expected 6) [ 954.367030] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node at LEB 0:0, LEB mapping status 1 Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
2015-03-20 10:39:42 +00:00
ubifs_err(c, "bad ref in znode");
ubifs_dump_znode(c, znode);
if (zbr->znode)
ubifs_dump_znode(c, zbr->znode);
return -EINVAL;
}
}
len = ubifs_idx_node_sz(c, znode->child_cnt);
ubifs_prepare_node(c, idx, len, 0);
ubifs_node_calc_hash(c, idx, hash);
mutex_lock(&c->tnc_mutex);
if (znode->cparent)
ubifs_copy_hash(c, hash,
znode->cparent->zbranch[znode->ciip].hash);
if (znode->parent) {
if (!ubifs_zn_obsolete(znode))
ubifs_copy_hash(c, hash,
znode->parent->zbranch[znode->iip].hash);
} else {
ubifs_copy_hash(c, hash, c->zroot.hash);
}
mutex_unlock(&c->tnc_mutex);
/* Determine the index node position */
if (lnum == -1) {
lnum = c->ilebs[lnum_pos++];
buf_offs = 0;
used = 0;
avail = buf_len;
}
offs = buf_offs + used;
if (lnum != znode->lnum || offs != znode->offs ||
len != znode->len) {
UBIFS: extend debug/message capabilities In the case where we have more than one volumes on different UBI devices, it may be not that easy to tell which volume prints the messages. Add ubi number and volume id in ubifs_msg/warn/error to help debug. These two values are passed by struct ubifs_info. For those where ubifs_info is not initialized yet, ubifs_* is replaced by pr_*. For those where ubifs_info is not avaliable, ubifs_info is passed to the calling function as a const parameter. The output looks like, [ 95.444879] UBIFS (ubi0:1): background thread "ubifs_bgt0_1" started, PID 696 [ 95.484688] UBIFS (ubi0:1): UBIFS: mounted UBI device 0, volume 1, name "test1" [ 95.484694] UBIFS (ubi0:1): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.484699] UBIFS (ubi0:1): FS size: 30220288 bytes (28 MiB, 238 LEBs), journal size 1523712 bytes (1 MiB, 12 LEBs) [ 95.484703] UBIFS (ubi0:1): reserved for root: 1427378 bytes (1393 KiB) [ 95.484709] UBIFS (ubi0:1): media format: w4/r0 (latest is w4/r0), UUID 40DFFC0E-70BE-4193-8905-F7D6DFE60B17, small LPT model [ 95.489875] UBIFS (ubi1:0): background thread "ubifs_bgt1_0" started, PID 699 [ 95.529713] UBIFS (ubi1:0): UBIFS: mounted UBI device 1, volume 0, name "test2" [ 95.529718] UBIFS (ubi1:0): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.529724] UBIFS (ubi1:0): FS size: 19808256 bytes (18 MiB, 156 LEBs), journal size 1015809 bytes (0 MiB, 8 LEBs) [ 95.529727] UBIFS (ubi1:0): reserved for root: 935592 bytes (913 KiB) [ 95.529733] UBIFS (ubi1:0): media format: w4/r0 (latest is w4/r0), UUID EEB7779D-F419-4CA9-811B-831CAC7233D4, small LPT model [ 954.264767] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node type (255 but expected 6) [ 954.367030] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node at LEB 0:0, LEB mapping status 1 Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
2015-03-20 10:39:42 +00:00
ubifs_err(c, "inconsistent znode posn");
return -EINVAL;
}
/* Grab some stuff from znode while we still can */
cnext = znode->cnext;
ubifs_assert(c, ubifs_zn_dirty(znode));
ubifs_assert(c, ubifs_zn_cow(znode));
/*
* It is important that other threads should see %DIRTY_ZNODE
* flag cleared before %COW_ZNODE. Specifically, it matters in
* the 'dirty_cow_znode()' function. This is the reason for the
* first barrier. Also, we want the bit changes to be seen to
* other threads ASAP, to avoid unnecesarry copying, which is
* the reason for the second barrier.
*/
clear_bit(DIRTY_ZNODE, &znode->flags);
smp_mb__before_atomic();
clear_bit(COW_ZNODE, &znode->flags);
smp_mb__after_atomic();
/*
* We have marked the znode as clean but have not updated the
* @c->clean_zn_cnt counter. If this znode becomes dirty again
* before 'free_obsolete_znodes()' is called, then
* @c->clean_zn_cnt will be decremented before it gets
* incremented (resulting in 2 decrements for the same znode).
* This means that @c->clean_zn_cnt may become negative for a
* while.
*
* Q: why we cannot increment @c->clean_zn_cnt?
* A: because we do not have the @c->tnc_mutex locked, and the
* following code would be racy and buggy:
*
* if (!ubifs_zn_obsolete(znode)) {
* atomic_long_inc(&c->clean_zn_cnt);
* atomic_long_inc(&ubifs_clean_zn_cnt);
* }
*
* Thus, we just delay the @c->clean_zn_cnt update until we
* have the mutex locked.
*/
/* Do not access znode from this point on */
/* Update buffer positions */
wlen = used + len;
used += ALIGN(len, 8);
avail -= ALIGN(len, 8);
/*
* Calculate the next index node length to see if there is
* enough room for it
*/
if (cnext == c->cnext)
next_len = 0;
else
next_len = ubifs_idx_node_sz(c, cnext->child_cnt);
nxt_offs = buf_offs + used + next_len;
if (next_len && nxt_offs <= c->leb_size) {
if (avail > 0)
continue;
else
blen = buf_len;
} else {
wlen = ALIGN(wlen, 8);
blen = ALIGN(wlen, c->min_io_size);
ubifs_pad(c, c->cbuf + wlen, blen - wlen);
}
/* The buffer is full or there are no more znodes to do */
err = ubifs_leb_write(c, lnum, c->cbuf, buf_offs, blen);
if (err)
return err;
buf_offs += blen;
if (next_len) {
if (nxt_offs > c->leb_size) {
err = ubifs_update_one_lp(c, lnum, LPROPS_NC, 0,
0, LPROPS_TAKEN);
if (err)
return err;
lnum = -1;
}
used -= blen;
if (used < 0)
used = 0;
avail = buf_len - used;
memmove(c->cbuf, c->cbuf + blen, used);
continue;
}
break;
}
if (lnum != c->dbg->new_ihead_lnum ||
buf_offs != c->dbg->new_ihead_offs) {
UBIFS: extend debug/message capabilities In the case where we have more than one volumes on different UBI devices, it may be not that easy to tell which volume prints the messages. Add ubi number and volume id in ubifs_msg/warn/error to help debug. These two values are passed by struct ubifs_info. For those where ubifs_info is not initialized yet, ubifs_* is replaced by pr_*. For those where ubifs_info is not avaliable, ubifs_info is passed to the calling function as a const parameter. The output looks like, [ 95.444879] UBIFS (ubi0:1): background thread "ubifs_bgt0_1" started, PID 696 [ 95.484688] UBIFS (ubi0:1): UBIFS: mounted UBI device 0, volume 1, name "test1" [ 95.484694] UBIFS (ubi0:1): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.484699] UBIFS (ubi0:1): FS size: 30220288 bytes (28 MiB, 238 LEBs), journal size 1523712 bytes (1 MiB, 12 LEBs) [ 95.484703] UBIFS (ubi0:1): reserved for root: 1427378 bytes (1393 KiB) [ 95.484709] UBIFS (ubi0:1): media format: w4/r0 (latest is w4/r0), UUID 40DFFC0E-70BE-4193-8905-F7D6DFE60B17, small LPT model [ 95.489875] UBIFS (ubi1:0): background thread "ubifs_bgt1_0" started, PID 699 [ 95.529713] UBIFS (ubi1:0): UBIFS: mounted UBI device 1, volume 0, name "test2" [ 95.529718] UBIFS (ubi1:0): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.529724] UBIFS (ubi1:0): FS size: 19808256 bytes (18 MiB, 156 LEBs), journal size 1015809 bytes (0 MiB, 8 LEBs) [ 95.529727] UBIFS (ubi1:0): reserved for root: 935592 bytes (913 KiB) [ 95.529733] UBIFS (ubi1:0): media format: w4/r0 (latest is w4/r0), UUID EEB7779D-F419-4CA9-811B-831CAC7233D4, small LPT model [ 954.264767] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node type (255 but expected 6) [ 954.367030] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node at LEB 0:0, LEB mapping status 1 Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
2015-03-20 10:39:42 +00:00
ubifs_err(c, "inconsistent ihead");
return -EINVAL;
}
c->ihead_lnum = lnum;
c->ihead_offs = buf_offs;
return 0;
}
/**
* free_obsolete_znodes - free obsolete znodes.
* @c: UBIFS file-system description object
*
* At the end of commit end, obsolete znodes are freed.
*/
static void free_obsolete_znodes(struct ubifs_info *c)
{
struct ubifs_znode *znode, *cnext;
cnext = c->cnext;
do {
znode = cnext;
cnext = znode->cnext;
if (ubifs_zn_obsolete(znode))
kfree(znode);
else {
znode->cnext = NULL;
atomic_long_inc(&c->clean_zn_cnt);
atomic_long_inc(&ubifs_clean_zn_cnt);
}
} while (cnext != c->cnext);
}
/**
* return_gap_lebs - return LEBs used by the in-gap commit method.
* @c: UBIFS file-system description object
*
* This function clears the "taken" flag for the LEBs which were used by the
* "commit in-the-gaps" method.
*/
static int return_gap_lebs(struct ubifs_info *c)
{
int *p, err;
if (!c->gap_lebs)
return 0;
dbg_cmt("");
for (p = c->gap_lebs; *p != -1; p++) {
err = ubifs_change_one_lp(c, *p, LPROPS_NC, LPROPS_NC, 0,
LPROPS_TAKEN, 0);
if (err)
return err;
}
kfree(c->gap_lebs);
c->gap_lebs = NULL;
return 0;
}
/**
* ubifs_tnc_end_commit - update the TNC for commit end.
* @c: UBIFS file-system description object
*
* Write the dirty znodes.
*/
int ubifs_tnc_end_commit(struct ubifs_info *c)
{
int err;
if (!c->cnext)
return 0;
err = return_gap_lebs(c);
if (err)
return err;
err = write_index(c);
if (err)
return err;
mutex_lock(&c->tnc_mutex);
dbg_cmt("TNC height is %d", c->zroot.znode->level + 1);
free_obsolete_znodes(c);
c->cnext = NULL;
kfree(c->ilebs);
c->ilebs = NULL;
mutex_unlock(&c->tnc_mutex);
return 0;
}