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| author |   Eric Biggers <ebiggers@google.com> | 2019-08-21 22:54:41 -0700 |
|---|---|---|
| committer |   Casey Schaufler <casey@schaufler-ca.com> | 2019-09-04 09:37:07 -0700 |
| commit | e5bfad3d7acc5702f32aafeb388362994f4d7bd0 (patch) | |
| tree | c9daa0267c2dd110e5a8ccbed94ac8c8edb9c6e6 /security/smack/smack_lsm.c | |
| parent | security: smack: Fix possible null-pointer dereferences in smack_socket_sock_rcv_skb() (diff) | |
| download | linux-dev-e5bfad3d7acc5702f32aafeb388362994f4d7bd0.tar.xz linux-dev-e5bfad3d7acc5702f32aafeb388362994f4d7bd0.zip | |
smack: use GFP_NOFS while holding inode_smack::smk_lock
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>
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 516f7ba96f1e..abeb09c30633 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); |