From: Tetsuo Handa penguin-kernel@i-love.sakura.ne.jp
stable inclusion from stable-5.10.51 commit 3780348c1a0e14ffefcaf1fc521f815bcaac94b0 bugzilla: 175263 https://gitee.com/openeuler/kernel/issues/I4DT6F
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 49ec114a6e62d8d320037ce71c1aaf9650b3cafd upstream.
Oops, I failed to update subject line.
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 Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- security/smack/smackfs.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index 334299357e71..b88c1a953833 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))