| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 213/215] smackfs: restrict bytes count in smk_set_cipso() | Date | Thu, 15 Jul 2021 20:39:45 +0200 |
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From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
commit 49ec114a6e62d8d320037ce71c1aaf9650b3cafd upstream.
Oops, I failed to update subject line.
>From 07571157c91b98ce1a4aa70967531e64b78e8346 Mon Sep 17 00:00:00 2001 From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Date: Mon, 12 Apr 2021 22:25:06 +0900 Subject: [PATCH 5.10 213/215] smackfs: restrict bytes count in smk_set_cipso()
Commit 7ef4c19d245f3dc2 ("smackfs: restrict bytes count in smackfs write functions") missed that count > SMK_CIPSOMAX check applies to only format == SMK_FIXED24_FMT case.
Reported-by: syzbot <syzbot+77c53db50c9fff774e8e@syzkaller.appspotmail.com> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- security/smack/smackfs.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -855,6 +855,8 @@ static ssize_t smk_set_cipso(struct file if (format == SMK_FIXED24_FMT && (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) return -EINVAL; + if (count > PAGE_SIZE) + return -EINVAL; data = memdup_user_nul(buf, count); if (IS_ERR(data))
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