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selinux: Add __GFP_NOWARN to allocation at str_read()

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commit 4458bba09788e70e8fb39ad003f087cd9dfbd6ac upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tetsuo Handa 2018-09-08 01:42:58 +09:00 committed by Greg Kroah-Hartman
parent 829567dd91
commit 3962e78a9f
1 changed files with 1 additions and 1 deletions
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2
security/selinux/ss/policydb.c
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@ -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;