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ext4: disallow ea_inodes with extended attributes 

An ea_inode stores the value of an extended attribute; it can not have
extended attributes itself, or this will cause recursive nightmares.
Add a check in ext4_iget() to make sure this is the case.

Cc: stable@kernel.org
Reported-by: syzbot+e44749b6ba4d0434cd47@syzkaller.appspotmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Link: https://lore.kernel.org/r/20230524034951.779531-4-tytso@mit.edu
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2023-05-23 23:49:50 -04:00
parent b928dfdcb2
commit 2bc7e7c1a3
1 changed files with 3 additions and 0 deletions
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3
fs/ext4/inode.c
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@ -4647,6 +4647,9 @@ static const char *check_igot_inode(struct inode *inode, ext4_iget_flags flags)
if (flags & EXT4_IGET_EA_INODE) {
if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL))
return "missing EA_INODE flag";
if (ext4_test_inode_state(inode, EXT4_STATE_XATTR) ||
EXT4_I(inode)->i_file_acl)
return "ea_inode with extended attributes";
} else {
if ((EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL))
return "unexpected EA_INODE flag";