From 4458bba09788e70e8fb39ad003f087cd9dfbd6ac Mon Sep 17 00:00:00 2001
From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Date: Sat, 8 Sep 2018 01:42:58 +0900
Subject: [PATCH] selinux: Add __GFP_NOWARN to allocation at str_read()
Git-commit: 4458bba09788e70e8fb39ad003f087cd9dfbd6ac
Patch-mainline: v4.20-rc1
References: bsc#1051510
syzbot is hitting warning at str_read() [1] because len parameter can
become larger than KMALLOC_MAX_SIZE. We don't need to emit warning for
this case.
[1] https://syzkaller.appspot.com/bug?id=7f2f5aad79ea8663c296a2eedb81978401a908f0
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: syzbot <syzbot+ac488b9811036cea7ea0@syzkaller.appspotmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
security/selinux/ss/policydb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index e9394e7adc84..f4eadd3f7350 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -1101,7 +1101,7 @@ static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
if ((len == 0) || (len == (u32)-1))
return -EINVAL;
- str = kmalloc(len + 1, flags);
+ str = kmalloc(len + 1, flags | __GFP_NOWARN);
if (!str)
return -ENOMEM;
--
2.16.4