linux-kernel - [PATCH 3.16 55/63] filldir[64]: remove WARN_ON

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <lsq.1578512578.259177693@decadent.org.uk>
Date:   Wed, 08 Jan 2020 19:43:53 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Siddharth Chandrasekaran" <csiddharth@...are.com>,
        syzbot+3031f712c7ad5dd4d926@...kaller.appspotmail.com
Subject: [PATCH 3.16 55/63] filldir[64]: remove WARN_ON_ONCE() for bad
 directory entries

3.16.81-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Linus Torvalds <torvalds@...ux-foundation.org>

commit b9959c7a347d6adbb558fba7e36e9fef3cba3b07 upstream.

This was always meant to be a temporary thing, just for testing and to
see if it actually ever triggered.

The only thing that reported it was syzbot doing disk image fuzzing, and
then that warning is expected.  So let's just remove it before -rc4,
because the extra sanity testing should probably go to -stable, but we
don't want the warning to do so.

Reported-by: syzbot+3031f712c7ad5dd4d926@...kaller.appspotmail.com
Fixes: 8a23eb804ca4 ("Make filldir[64]() verify the directory entry filename is valid")
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Siddharth Chandrasekaran <csiddharth@...are.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/readdir.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -77,9 +77,9 @@ EXPORT_SYMBOL(iterate_dir);
  */
 static int verify_dirent_name(const char *name, int len)
 {
-	if (WARN_ON_ONCE(!len))
+	if (!len)
 		return -EIO;
-	if (WARN_ON_ONCE(memchr(name, '/', len)))
+	if (memchr(name, '/', len))
 		return -EIO;
 	return 0;
 }