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![Gao Xiang](/assets/img/avatar_default.png)
syzbot generated a crafted bitszbits which can be shifted out-of-bounds[1]. So directly print unsupported blkszbits instead of blksize. [1] https://lore.kernel.org/r/000000000000c72ddd05b9444d2f@google.com Link: https://lore.kernel.org/r/20210120013016.14071-1-hsiangkao@aol.com Reported-by: syzbot+c68f467cd7c45860e8d4@syzkaller.appspotmail.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
610 lines
14 KiB
C
610 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2017-2018 HUAWEI, Inc.
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* https://www.huawei.com/
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* Created by Gao Xiang <gaoxiang25@huawei.com>
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*/
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#include <linux/module.h>
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#include <linux/buffer_head.h>
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#include <linux/statfs.h>
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#include <linux/parser.h>
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#include <linux/seq_file.h>
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#include <linux/crc32c.h>
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#include <linux/fs_context.h>
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#include <linux/fs_parser.h>
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#include "xattr.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/erofs.h>
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static struct kmem_cache *erofs_inode_cachep __read_mostly;
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void _erofs_err(struct super_block *sb, const char *function,
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const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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pr_err("(device %s): %s: %pV", sb->s_id, function, &vaf);
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va_end(args);
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}
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void _erofs_info(struct super_block *sb, const char *function,
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const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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pr_info("(device %s): %pV", sb->s_id, &vaf);
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va_end(args);
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}
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static int erofs_superblock_csum_verify(struct super_block *sb, void *sbdata)
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{
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struct erofs_super_block *dsb;
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u32 expected_crc, crc;
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dsb = kmemdup(sbdata + EROFS_SUPER_OFFSET,
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EROFS_BLKSIZ - EROFS_SUPER_OFFSET, GFP_KERNEL);
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if (!dsb)
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return -ENOMEM;
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expected_crc = le32_to_cpu(dsb->checksum);
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dsb->checksum = 0;
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/* to allow for x86 boot sectors and other oddities. */
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crc = crc32c(~0, dsb, EROFS_BLKSIZ - EROFS_SUPER_OFFSET);
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kfree(dsb);
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if (crc != expected_crc) {
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erofs_err(sb, "invalid checksum 0x%08x, 0x%08x expected",
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crc, expected_crc);
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return -EBADMSG;
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}
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return 0;
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}
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static void erofs_inode_init_once(void *ptr)
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{
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struct erofs_inode *vi = ptr;
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inode_init_once(&vi->vfs_inode);
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}
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static struct inode *erofs_alloc_inode(struct super_block *sb)
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{
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struct erofs_inode *vi =
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kmem_cache_alloc(erofs_inode_cachep, GFP_KERNEL);
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if (!vi)
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return NULL;
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/* zero out everything except vfs_inode */
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memset(vi, 0, offsetof(struct erofs_inode, vfs_inode));
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return &vi->vfs_inode;
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}
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static void erofs_free_inode(struct inode *inode)
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{
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struct erofs_inode *vi = EROFS_I(inode);
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/* be careful of RCU symlink path */
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if (inode->i_op == &erofs_fast_symlink_iops)
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kfree(inode->i_link);
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kfree(vi->xattr_shared_xattrs);
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kmem_cache_free(erofs_inode_cachep, vi);
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}
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static bool check_layout_compatibility(struct super_block *sb,
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struct erofs_super_block *dsb)
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{
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const unsigned int feature = le32_to_cpu(dsb->feature_incompat);
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EROFS_SB(sb)->feature_incompat = feature;
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/* check if current kernel meets all mandatory requirements */
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if (feature & (~EROFS_ALL_FEATURE_INCOMPAT)) {
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erofs_err(sb,
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"unidentified incompatible feature %x, please upgrade kernel version",
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feature & ~EROFS_ALL_FEATURE_INCOMPAT);
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return false;
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}
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return true;
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}
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static int erofs_read_superblock(struct super_block *sb)
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{
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struct erofs_sb_info *sbi;
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struct page *page;
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struct erofs_super_block *dsb;
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unsigned int blkszbits;
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void *data;
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int ret;
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page = read_mapping_page(sb->s_bdev->bd_inode->i_mapping, 0, NULL);
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if (IS_ERR(page)) {
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erofs_err(sb, "cannot read erofs superblock");
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return PTR_ERR(page);
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}
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sbi = EROFS_SB(sb);
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data = kmap(page);
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dsb = (struct erofs_super_block *)(data + EROFS_SUPER_OFFSET);
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ret = -EINVAL;
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if (le32_to_cpu(dsb->magic) != EROFS_SUPER_MAGIC_V1) {
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erofs_err(sb, "cannot find valid erofs superblock");
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goto out;
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}
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sbi->feature_compat = le32_to_cpu(dsb->feature_compat);
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if (sbi->feature_compat & EROFS_FEATURE_COMPAT_SB_CHKSUM) {
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ret = erofs_superblock_csum_verify(sb, data);
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if (ret)
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goto out;
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}
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blkszbits = dsb->blkszbits;
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/* 9(512 bytes) + LOG_SECTORS_PER_BLOCK == LOG_BLOCK_SIZE */
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if (blkszbits != LOG_BLOCK_SIZE) {
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erofs_err(sb, "blkszbits %u isn't supported on this platform",
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blkszbits);
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goto out;
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}
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if (!check_layout_compatibility(sb, dsb))
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goto out;
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sbi->blocks = le32_to_cpu(dsb->blocks);
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sbi->meta_blkaddr = le32_to_cpu(dsb->meta_blkaddr);
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#ifdef CONFIG_EROFS_FS_XATTR
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sbi->xattr_blkaddr = le32_to_cpu(dsb->xattr_blkaddr);
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#endif
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sbi->islotbits = ilog2(sizeof(struct erofs_inode_compact));
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sbi->root_nid = le16_to_cpu(dsb->root_nid);
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sbi->inos = le64_to_cpu(dsb->inos);
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sbi->build_time = le64_to_cpu(dsb->build_time);
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sbi->build_time_nsec = le32_to_cpu(dsb->build_time_nsec);
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memcpy(&sb->s_uuid, dsb->uuid, sizeof(dsb->uuid));
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ret = strscpy(sbi->volume_name, dsb->volume_name,
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sizeof(dsb->volume_name));
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if (ret < 0) { /* -E2BIG */
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erofs_err(sb, "bad volume name without NIL terminator");
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ret = -EFSCORRUPTED;
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goto out;
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}
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ret = 0;
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out:
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kunmap(page);
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put_page(page);
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return ret;
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}
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/* set up default EROFS parameters */
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static void erofs_default_options(struct erofs_fs_context *ctx)
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{
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#ifdef CONFIG_EROFS_FS_ZIP
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ctx->cache_strategy = EROFS_ZIP_CACHE_READAROUND;
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ctx->max_sync_decompress_pages = 3;
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#endif
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#ifdef CONFIG_EROFS_FS_XATTR
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set_opt(ctx, XATTR_USER);
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#endif
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#ifdef CONFIG_EROFS_FS_POSIX_ACL
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set_opt(ctx, POSIX_ACL);
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#endif
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}
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enum {
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Opt_user_xattr,
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Opt_acl,
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Opt_cache_strategy,
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Opt_err
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};
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static const struct constant_table erofs_param_cache_strategy[] = {
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{"disabled", EROFS_ZIP_CACHE_DISABLED},
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{"readahead", EROFS_ZIP_CACHE_READAHEAD},
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{"readaround", EROFS_ZIP_CACHE_READAROUND},
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{}
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};
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static const struct fs_parameter_spec erofs_fs_parameters[] = {
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fsparam_flag_no("user_xattr", Opt_user_xattr),
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fsparam_flag_no("acl", Opt_acl),
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fsparam_enum("cache_strategy", Opt_cache_strategy,
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erofs_param_cache_strategy),
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{}
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};
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static int erofs_fc_parse_param(struct fs_context *fc,
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struct fs_parameter *param)
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{
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struct erofs_fs_context *ctx __maybe_unused = fc->fs_private;
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struct fs_parse_result result;
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int opt;
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opt = fs_parse(fc, erofs_fs_parameters, param, &result);
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if (opt < 0)
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return opt;
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switch (opt) {
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case Opt_user_xattr:
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#ifdef CONFIG_EROFS_FS_XATTR
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if (result.boolean)
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set_opt(ctx, XATTR_USER);
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else
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clear_opt(ctx, XATTR_USER);
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#else
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errorfc(fc, "{,no}user_xattr options not supported");
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#endif
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break;
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case Opt_acl:
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#ifdef CONFIG_EROFS_FS_POSIX_ACL
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if (result.boolean)
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set_opt(ctx, POSIX_ACL);
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else
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clear_opt(ctx, POSIX_ACL);
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#else
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errorfc(fc, "{,no}acl options not supported");
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#endif
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break;
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case Opt_cache_strategy:
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#ifdef CONFIG_EROFS_FS_ZIP
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ctx->cache_strategy = result.uint_32;
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#else
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errorfc(fc, "compression not supported, cache_strategy ignored");
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#endif
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break;
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default:
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return -ENOPARAM;
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}
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return 0;
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}
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#ifdef CONFIG_EROFS_FS_ZIP
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static const struct address_space_operations managed_cache_aops;
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static int erofs_managed_cache_releasepage(struct page *page, gfp_t gfp_mask)
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{
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int ret = 1; /* 0 - busy */
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struct address_space *const mapping = page->mapping;
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DBG_BUGON(!PageLocked(page));
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DBG_BUGON(mapping->a_ops != &managed_cache_aops);
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if (PagePrivate(page))
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ret = erofs_try_to_free_cached_page(mapping, page);
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return ret;
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}
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static void erofs_managed_cache_invalidatepage(struct page *page,
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unsigned int offset,
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unsigned int length)
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{
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const unsigned int stop = length + offset;
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DBG_BUGON(!PageLocked(page));
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/* Check for potential overflow in debug mode */
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DBG_BUGON(stop > PAGE_SIZE || stop < length);
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if (offset == 0 && stop == PAGE_SIZE)
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while (!erofs_managed_cache_releasepage(page, GFP_NOFS))
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cond_resched();
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}
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static const struct address_space_operations managed_cache_aops = {
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.releasepage = erofs_managed_cache_releasepage,
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.invalidatepage = erofs_managed_cache_invalidatepage,
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};
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static int erofs_init_managed_cache(struct super_block *sb)
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{
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struct erofs_sb_info *const sbi = EROFS_SB(sb);
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struct inode *const inode = new_inode(sb);
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if (!inode)
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return -ENOMEM;
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set_nlink(inode, 1);
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inode->i_size = OFFSET_MAX;
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inode->i_mapping->a_ops = &managed_cache_aops;
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mapping_set_gfp_mask(inode->i_mapping,
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GFP_NOFS | __GFP_HIGHMEM | __GFP_MOVABLE);
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sbi->managed_cache = inode;
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return 0;
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}
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#else
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static int erofs_init_managed_cache(struct super_block *sb) { return 0; }
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#endif
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static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
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{
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struct inode *inode;
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struct erofs_sb_info *sbi;
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struct erofs_fs_context *ctx = fc->fs_private;
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int err;
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sb->s_magic = EROFS_SUPER_MAGIC;
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if (!sb_set_blocksize(sb, EROFS_BLKSIZ)) {
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erofs_err(sb, "failed to set erofs blksize");
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return -EINVAL;
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}
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sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
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if (!sbi)
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return -ENOMEM;
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sb->s_fs_info = sbi;
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err = erofs_read_superblock(sb);
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if (err)
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return err;
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sb->s_flags |= SB_RDONLY | SB_NOATIME;
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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sb->s_time_gran = 1;
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sb->s_op = &erofs_sops;
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sb->s_xattr = erofs_xattr_handlers;
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if (test_opt(ctx, POSIX_ACL))
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sb->s_flags |= SB_POSIXACL;
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else
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sb->s_flags &= ~SB_POSIXACL;
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sbi->ctx = *ctx;
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#ifdef CONFIG_EROFS_FS_ZIP
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xa_init(&sbi->managed_pslots);
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#endif
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/* get the root inode */
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inode = erofs_iget(sb, ROOT_NID(sbi), true);
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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if (!S_ISDIR(inode->i_mode)) {
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erofs_err(sb, "rootino(nid %llu) is not a directory(i_mode %o)",
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ROOT_NID(sbi), inode->i_mode);
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iput(inode);
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return -EINVAL;
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}
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sb->s_root = d_make_root(inode);
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if (!sb->s_root)
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return -ENOMEM;
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erofs_shrinker_register(sb);
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/* sb->s_umount is already locked, SB_ACTIVE and SB_BORN are not set */
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err = erofs_init_managed_cache(sb);
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if (err)
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return err;
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erofs_info(sb, "mounted with root inode @ nid %llu.", ROOT_NID(sbi));
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return 0;
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}
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static int erofs_fc_get_tree(struct fs_context *fc)
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{
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return get_tree_bdev(fc, erofs_fc_fill_super);
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}
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static int erofs_fc_reconfigure(struct fs_context *fc)
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{
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struct super_block *sb = fc->root->d_sb;
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struct erofs_sb_info *sbi = EROFS_SB(sb);
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struct erofs_fs_context *ctx = fc->fs_private;
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DBG_BUGON(!sb_rdonly(sb));
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if (test_opt(ctx, POSIX_ACL))
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fc->sb_flags |= SB_POSIXACL;
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else
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fc->sb_flags &= ~SB_POSIXACL;
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sbi->ctx = *ctx;
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fc->sb_flags |= SB_RDONLY;
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return 0;
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}
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static void erofs_fc_free(struct fs_context *fc)
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{
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kfree(fc->fs_private);
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}
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static const struct fs_context_operations erofs_context_ops = {
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.parse_param = erofs_fc_parse_param,
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.get_tree = erofs_fc_get_tree,
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.reconfigure = erofs_fc_reconfigure,
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.free = erofs_fc_free,
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};
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static int erofs_init_fs_context(struct fs_context *fc)
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{
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fc->fs_private = kzalloc(sizeof(struct erofs_fs_context), GFP_KERNEL);
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if (!fc->fs_private)
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return -ENOMEM;
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/* set default mount options */
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erofs_default_options(fc->fs_private);
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fc->ops = &erofs_context_ops;
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return 0;
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}
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/*
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* could be triggered after deactivate_locked_super()
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* is called, thus including umount and failed to initialize.
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*/
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static void erofs_kill_sb(struct super_block *sb)
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{
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struct erofs_sb_info *sbi;
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WARN_ON(sb->s_magic != EROFS_SUPER_MAGIC);
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kill_block_super(sb);
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sbi = EROFS_SB(sb);
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if (!sbi)
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return;
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kfree(sbi);
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sb->s_fs_info = NULL;
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}
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/* called when ->s_root is non-NULL */
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static void erofs_put_super(struct super_block *sb)
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{
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struct erofs_sb_info *const sbi = EROFS_SB(sb);
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DBG_BUGON(!sbi);
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erofs_shrinker_unregister(sb);
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#ifdef CONFIG_EROFS_FS_ZIP
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iput(sbi->managed_cache);
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sbi->managed_cache = NULL;
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#endif
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}
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static struct file_system_type erofs_fs_type = {
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.owner = THIS_MODULE,
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.name = "erofs",
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.init_fs_context = erofs_init_fs_context,
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.kill_sb = erofs_kill_sb,
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.fs_flags = FS_REQUIRES_DEV,
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};
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MODULE_ALIAS_FS("erofs");
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static int __init erofs_module_init(void)
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{
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int err;
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erofs_check_ondisk_layout_definitions();
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erofs_inode_cachep = kmem_cache_create("erofs_inode",
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sizeof(struct erofs_inode), 0,
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SLAB_RECLAIM_ACCOUNT,
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erofs_inode_init_once);
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if (!erofs_inode_cachep) {
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err = -ENOMEM;
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goto icache_err;
|
|
}
|
|
|
|
err = erofs_init_shrinker();
|
|
if (err)
|
|
goto shrinker_err;
|
|
|
|
err = z_erofs_init_zip_subsystem();
|
|
if (err)
|
|
goto zip_err;
|
|
|
|
err = register_filesystem(&erofs_fs_type);
|
|
if (err)
|
|
goto fs_err;
|
|
|
|
return 0;
|
|
|
|
fs_err:
|
|
z_erofs_exit_zip_subsystem();
|
|
zip_err:
|
|
erofs_exit_shrinker();
|
|
shrinker_err:
|
|
kmem_cache_destroy(erofs_inode_cachep);
|
|
icache_err:
|
|
return err;
|
|
}
|
|
|
|
static void __exit erofs_module_exit(void)
|
|
{
|
|
unregister_filesystem(&erofs_fs_type);
|
|
z_erofs_exit_zip_subsystem();
|
|
erofs_exit_shrinker();
|
|
|
|
/* Ensure all RCU free inodes are safe before cache is destroyed. */
|
|
rcu_barrier();
|
|
kmem_cache_destroy(erofs_inode_cachep);
|
|
}
|
|
|
|
/* get filesystem statistics */
|
|
static int erofs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
struct erofs_sb_info *sbi = EROFS_SB(sb);
|
|
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
|
|
|
|
buf->f_type = sb->s_magic;
|
|
buf->f_bsize = EROFS_BLKSIZ;
|
|
buf->f_blocks = sbi->blocks;
|
|
buf->f_bfree = buf->f_bavail = 0;
|
|
|
|
buf->f_files = ULLONG_MAX;
|
|
buf->f_ffree = ULLONG_MAX - sbi->inos;
|
|
|
|
buf->f_namelen = EROFS_NAME_LEN;
|
|
|
|
buf->f_fsid = u64_to_fsid(id);
|
|
return 0;
|
|
}
|
|
|
|
static int erofs_show_options(struct seq_file *seq, struct dentry *root)
|
|
{
|
|
struct erofs_sb_info *sbi __maybe_unused = EROFS_SB(root->d_sb);
|
|
struct erofs_fs_context *ctx __maybe_unused = &sbi->ctx;
|
|
|
|
#ifdef CONFIG_EROFS_FS_XATTR
|
|
if (test_opt(ctx, XATTR_USER))
|
|
seq_puts(seq, ",user_xattr");
|
|
else
|
|
seq_puts(seq, ",nouser_xattr");
|
|
#endif
|
|
#ifdef CONFIG_EROFS_FS_POSIX_ACL
|
|
if (test_opt(ctx, POSIX_ACL))
|
|
seq_puts(seq, ",acl");
|
|
else
|
|
seq_puts(seq, ",noacl");
|
|
#endif
|
|
#ifdef CONFIG_EROFS_FS_ZIP
|
|
if (ctx->cache_strategy == EROFS_ZIP_CACHE_DISABLED)
|
|
seq_puts(seq, ",cache_strategy=disabled");
|
|
else if (ctx->cache_strategy == EROFS_ZIP_CACHE_READAHEAD)
|
|
seq_puts(seq, ",cache_strategy=readahead");
|
|
else if (ctx->cache_strategy == EROFS_ZIP_CACHE_READAROUND)
|
|
seq_puts(seq, ",cache_strategy=readaround");
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
const struct super_operations erofs_sops = {
|
|
.put_super = erofs_put_super,
|
|
.alloc_inode = erofs_alloc_inode,
|
|
.free_inode = erofs_free_inode,
|
|
.statfs = erofs_statfs,
|
|
.show_options = erofs_show_options,
|
|
};
|
|
|
|
module_init(erofs_module_init);
|
|
module_exit(erofs_module_exit);
|
|
|
|
MODULE_DESCRIPTION("Enhanced ROM File System");
|
|
MODULE_AUTHOR("Gao Xiang, Chao Yu, Miao Xie, CONSUMER BG, HUAWEI Inc.");
|
|
MODULE_LICENSE("GPL");
|
|
|