diff options
| author | Eric Biggers <ebiggers@google.com> | 2019-08-21 22:54:41 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-07 18:59:40 +0200 |
| commit | 069a73c9344775f29302180adf377b0ccfe295be (patch) | |
| tree | 7661cfa822e2d634a847fc71963b412c3c9cb1df /security/smack/smack_lsm.c | |
| parent | 73cf33180fd5786b83fb1fd469a41c8293f4c7ca (diff) | |
| download | linux-stable-069a73c9344775f29302180adf377b0ccfe295be.tar.gz linux-stable-069a73c9344775f29302180adf377b0ccfe295be.tar.bz2 linux-stable-069a73c9344775f29302180adf377b0ccfe295be.zip | |
smack: use GFP_NOFS while holding inode_smack::smk_lock
commit e5bfad3d7acc5702f32aafeb388362994f4d7bd0 upstream.
inode_smack::smk_lock is taken during smack_d_instantiate(), which is
called during a filesystem transaction when creating a file on ext4.
Therefore to avoid a deadlock, all code that takes this lock must use
GFP_NOFS, to prevent memory reclaim from waiting for the filesystem
transaction to complete.
Reported-by: syzbot+0eefc1e06a77d327a056@syzkaller.appspotmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'security/smack/smack_lsm.c')
| -rw-r--r-- | security/smack/smack_lsm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 4777e3eb3ae8..36b6b9d4cbaf 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -288,7 +288,7 @@ static struct smack_known *smk_fetch(const char *name, struct inode *ip, if (!(ip->i_opflags & IOP_XATTR)) return ERR_PTR(-EOPNOTSUPP); - buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); + buffer = kzalloc(SMK_LONGLABEL, GFP_NOFS); if (buffer == NULL) return ERR_PTR(-ENOMEM); |