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![Randall Huang](/assets/img/avatar_default.png)
When we traverse xattr entries via __find_xattr(), if the raw filesystem content is faked or any hardware failure occurs, out-of-bound error can be detected by KASAN. Fix the issue by introducing boundary check. [ 38.402878] c7 1827 BUG: KASAN: slab-out-of-bounds in f2fs_getxattr+0x518/0x68c [ 38.402891] c7 1827 Read of size 4 at addr ffffffc0b6fb35dc by task [ 38.402935] c7 1827 Call trace: [ 38.402952] c7 1827 [<ffffff900809003c>] dump_backtrace+0x0/0x6bc [ 38.402966] c7 1827 [<ffffff9008090030>] show_stack+0x20/0x2c [ 38.402981] c7 1827 [<ffffff900871ab10>] dump_stack+0xfc/0x140 [ 38.402995] c7 1827 [<ffffff9008325c40>] print_address_description+0x80/0x2d8 [ 38.403009] c7 1827 [<ffffff900832629c>] kasan_report_error+0x198/0x1fc [ 38.403022] c7 1827 [<ffffff9008326104>] kasan_report_error+0x0/0x1fc [ 38.403037] c7 1827 [<ffffff9008325000>] __asan_load4+0x1b0/0x1b8 [ 38.403051] c7 1827 [<ffffff90085fcc44>] f2fs_getxattr+0x518/0x68c [ 38.403066] c7 1827 [<ffffff90085fc508>] f2fs_xattr_generic_get+0xb0/0xd0 [ 38.403080] c7 1827 [<ffffff9008395708>] __vfs_getxattr+0x1f4/0x1fc [ 38.403096] c7 1827 [<ffffff9008621bd0>] inode_doinit_with_dentry+0x360/0x938 [ 38.403109] c7 1827 [<ffffff900862d6cc>] selinux_d_instantiate+0x2c/0x38 [ 38.403123] c7 1827 [<ffffff900861b018>] security_d_instantiate+0x68/0x98 [ 38.403136] c7 1827 [<ffffff9008377db8>] d_splice_alias+0x58/0x348 [ 38.403149] c7 1827 [<ffffff900858d16c>] f2fs_lookup+0x608/0x774 [ 38.403163] c7 1827 [<ffffff900835eacc>] lookup_slow+0x1e0/0x2cc [ 38.403177] c7 1827 [<ffffff9008367fe0>] walk_component+0x160/0x520 [ 38.403190] c7 1827 [<ffffff9008369ef4>] path_lookupat+0x110/0x2b4 [ 38.403203] c7 1827 [<ffffff900835dd38>] filename_lookup+0x1d8/0x3a8 [ 38.403216] c7 1827 [<ffffff900835eeb0>] user_path_at_empty+0x54/0x68 [ 38.403229] c7 1827 [<ffffff9008395f44>] SyS_getxattr+0xb4/0x18c [ 38.403241] c7 1827 [<ffffff9008084200>] el0_svc_naked+0x34/0x38 Signed-off-by: Randall Huang <huangrandall@google.com> [Jaegeuk Kim: Fix wrong ending boundary] Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
163 lines
4.9 KiB
C
163 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* fs/f2fs/xattr.h
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* Portions of this code from linux/fs/ext2/xattr.h
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*
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* On-disk format of extended attributes for the ext2 filesystem.
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*
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* (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
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*/
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#ifndef __F2FS_XATTR_H__
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#define __F2FS_XATTR_H__
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#include <linux/init.h>
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#include <linux/xattr.h>
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/* Magic value in attribute blocks */
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#define F2FS_XATTR_MAGIC 0xF2F52011
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/* Maximum number of references to one attribute block */
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#define F2FS_XATTR_REFCOUNT_MAX 1024
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/* Name indexes */
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#define F2FS_SYSTEM_ADVISE_NAME "system.advise"
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#define F2FS_XATTR_INDEX_USER 1
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#define F2FS_XATTR_INDEX_POSIX_ACL_ACCESS 2
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#define F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT 3
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#define F2FS_XATTR_INDEX_TRUSTED 4
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#define F2FS_XATTR_INDEX_LUSTRE 5
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#define F2FS_XATTR_INDEX_SECURITY 6
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#define F2FS_XATTR_INDEX_ADVISE 7
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/* Should be same as EXT4_XATTR_INDEX_ENCRYPTION */
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#define F2FS_XATTR_INDEX_ENCRYPTION 9
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#define F2FS_XATTR_NAME_ENCRYPTION_CONTEXT "c"
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struct f2fs_xattr_header {
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__le32 h_magic; /* magic number for identification */
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__le32 h_refcount; /* reference count */
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__u32 h_reserved[4]; /* zero right now */
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};
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struct f2fs_xattr_entry {
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__u8 e_name_index;
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__u8 e_name_len;
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__le16 e_value_size; /* size of attribute value */
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char e_name[0]; /* attribute name */
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};
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#define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr))
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#define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr))
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#define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr) + 1))
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#define XATTR_ROUND (3)
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#define XATTR_ALIGN(size) (((size) + XATTR_ROUND) & ~XATTR_ROUND)
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#define ENTRY_SIZE(entry) (XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + \
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(entry)->e_name_len + le16_to_cpu((entry)->e_value_size)))
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#define XATTR_NEXT_ENTRY(entry) ((struct f2fs_xattr_entry *)((char *)(entry) +\
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ENTRY_SIZE(entry)))
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#define IS_XATTR_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)
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#define list_for_each_xattr(entry, addr) \
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for (entry = XATTR_FIRST_ENTRY(addr);\
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!IS_XATTR_LAST_ENTRY(entry);\
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entry = XATTR_NEXT_ENTRY(entry))
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#define VALID_XATTR_BLOCK_SIZE (PAGE_SIZE - sizeof(struct node_footer))
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#define XATTR_PADDING_SIZE (sizeof(__u32))
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#define XATTR_SIZE(x,i) (((x) ? VALID_XATTR_BLOCK_SIZE : 0) + \
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(inline_xattr_size(i)))
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#define MIN_OFFSET(i) XATTR_ALIGN(inline_xattr_size(i) + \
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VALID_XATTR_BLOCK_SIZE)
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#define MAX_VALUE_LEN(i) (MIN_OFFSET(i) - \
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sizeof(struct f2fs_xattr_header) - \
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sizeof(struct f2fs_xattr_entry))
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#define MAX_INLINE_XATTR_SIZE \
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(DEF_ADDRS_PER_INODE - \
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F2FS_TOTAL_EXTRA_ATTR_SIZE / sizeof(__le32) - \
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DEF_INLINE_RESERVED_SIZE - \
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MIN_INLINE_DENTRY_SIZE / sizeof(__le32))
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/*
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* On-disk structure of f2fs_xattr
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* We use inline xattrs space + 1 block for xattr.
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*
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* +--------------------+
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* | f2fs_xattr_header |
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* | |
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* +--------------------+
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* | f2fs_xattr_entry |
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* | .e_name_index = 1 |
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* | .e_name_len = 3 |
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* | .e_value_size = 14 |
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* | .e_name = "foo" |
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* | "value_of_xattr" |<- value_offs = e_name + e_name_len
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* +--------------------+
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* | f2fs_xattr_entry |
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* | .e_name_index = 4 |
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* | .e_name = "bar" |
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* +--------------------+
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* | |
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* | Free |
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* | |
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* +--------------------+<- MIN_OFFSET
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* | node_footer |
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* | (nid, ino, offset) |
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* +--------------------+
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*
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**/
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#ifdef CONFIG_F2FS_FS_XATTR
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extern const struct xattr_handler f2fs_xattr_user_handler;
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extern const struct xattr_handler f2fs_xattr_trusted_handler;
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extern const struct xattr_handler f2fs_xattr_advise_handler;
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extern const struct xattr_handler f2fs_xattr_security_handler;
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extern const struct xattr_handler *f2fs_xattr_handlers[];
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extern int f2fs_setxattr(struct inode *, int, const char *,
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const void *, size_t, struct page *, int);
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extern int f2fs_getxattr(struct inode *, int, const char *, void *,
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size_t, struct page *);
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extern ssize_t f2fs_listxattr(struct dentry *, char *, size_t);
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#else
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#define f2fs_xattr_handlers NULL
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static inline int f2fs_setxattr(struct inode *inode, int index,
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const char *name, const void *value, size_t size,
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struct page *page, int flags)
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{
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return -EOPNOTSUPP;
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}
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static inline int f2fs_getxattr(struct inode *inode, int index,
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const char *name, void *buffer,
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size_t buffer_size, struct page *dpage)
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{
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return -EOPNOTSUPP;
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}
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static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer,
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size_t buffer_size)
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{
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return -EOPNOTSUPP;
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}
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#endif
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#ifdef CONFIG_F2FS_FS_SECURITY
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extern int f2fs_init_security(struct inode *, struct inode *,
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const struct qstr *, struct page *);
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#else
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static inline int f2fs_init_security(struct inode *inode, struct inode *dir,
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const struct qstr *qstr, struct page *ipage)
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{
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return 0;
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}
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#endif
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#endif /* __F2FS_XATTR_H__ */
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