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ocfs2: add bounds checking to ocfs2_xattr_find_entry()

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Add a paranoia check to make sure it doesn't stray beyond valid memory
region containing ocfs2 xattr entries when scanning for a match.  It will
prevent out-of-bound access in case of crafted images.

Link: https://lkml.kernel.org/r/20240520024024.1976129-1-joseph.qi@linux.alibaba.com
Signed-off-by: Ferry Meng <mengferry@linux.alibaba.com>
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reported-by: lei lu <llfamsec@gmail.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Ferry Meng 2024-05-20 10:40:23 +08:00 committed by Andrew Morton
parent 82a9d6bdd4
commit 9e3041fecd
1 changed files with 8 additions and 4 deletions
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12
fs/ocfs2/xattr.c
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@ -1062,7 +1062,7 @@ ssize_t ocfs2_listxattr(struct dentry *dentry,
return i_ret + b_ret;
}
static int ocfs2_xattr_find_entry(int name_index,
static int ocfs2_xattr_find_entry(struct inode *inode, int name_index,
const char *name,
struct ocfs2_xattr_search *xs)
{
@ -1076,6 +1076,10 @@ static int ocfs2_xattr_find_entry(int name_index,
name_len = strlen(name);
entry = xs->here;
for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
if ((void *)entry >= xs->end) {
ocfs2_error(inode->i_sb, "corrupted xattr entries");
return -EFSCORRUPTED;
}
cmp = name_index - ocfs2_xattr_get_type(entry);
if (!cmp)
cmp = name_len - entry->xe_name_len;
@ -1166,7 +1170,7 @@ static int ocfs2_xattr_ibody_get(struct inode *inode,
xs->base = (void *)xs->header;
xs->here = xs->header->xh_entries;
ret = ocfs2_xattr_find_entry(name_index, name, xs);
ret = ocfs2_xattr_find_entry(inode, name_index, name, xs);
if (ret)
return ret;
size = le64_to_cpu(xs->here->xe_value_size);
@ -2698,7 +2702,7 @@ static int ocfs2_xattr_ibody_find(struct inode *inode,
/* Find the named attribute. */
if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
ret = ocfs2_xattr_find_entry(name_index, name, xs);
ret = ocfs2_xattr_find_entry(inode, name_index, name, xs);
if (ret && ret != -ENODATA)
return ret;
xs->not_found = ret;
@ -2833,7 +2837,7 @@ static int ocfs2_xattr_block_find(struct inode *inode,
xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
xs->here = xs->header->xh_entries;
ret = ocfs2_xattr_find_entry(name_index, name, xs);
ret = ocfs2_xattr_find_entry(inode, name_index, name, xs);
} else
ret = ocfs2_xattr_index_block_find(inode, blk_bh,
name_index,