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authorTetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>2021-04-12 16:45:50 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-07-19 11:01:28 +0300
commit8f5c773a2871cf446e3f36b2834fb25bbb28512b (patch)
treeb3baf9f2f5d9610f7b0a4a5f2d04f63ada95d9a7
parentdc02c0b2bd6096f2f3ce63e1fc317aeda05f74d8 (diff)
downloadlinux-8f5c773a2871cf446e3f36b2834fb25bbb28512b.tar.xz
smackfs: restrict bytes count in smk_set_cipso()
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: 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>
-rw-r--r--security/smack/smackfs.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 22ded2c26089..1ad7d0d1ea62 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -855,6 +855,8 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
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))