From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9D22E33C526; Fri, 21 Nov 2025 13:48:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763732929; cv=none; b=h2VqAGj8upqs+moZ/nM+R+ZjENz+FeCIiuPvJLh8b4MxCksAfV5RpkDczDw6e4Mozj7ZEloeRnxWaN580mxi3JXp6KH4S8IPBf8Dd8g9amgo00Ya87T4VfZIAzGe+gQl//SlgBd+/HKxMF8L58vx0hGd0E7atAbEc80+5HXZB9k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763732929; c=relaxed/simple; bh=rKOJjSI985DT483f6WS1ii/Vm3f5ouHcARIvrOD2lRY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QKpDUwaxa2u1wfWbVkQj6Q4xV86tP4bcfNcnT8VE9a8kBLnuCOCY/Tzl/iO3+phF++3JrzjgShk6zJlNWHHz6d7FWm2c1aiWX5j33cn6AgAHRb8bxLeybhn3irdzCU2lTIPQ/Z/6lYJn/jCYn4HEMoaG/a8MYauryWnwllHPpU4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=eHhMjnfW; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="eHhMjnfW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 22500C4CEF1; Fri, 21 Nov 2025 13:48:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1763732929; bh=rKOJjSI985DT483f6WS1ii/Vm3f5ouHcARIvrOD2lRY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eHhMjnfW8PL6bLFeAAMipUH1j3zUr0mw7gmTm7gqFamfcywLEjeYVjzdNy7TRzY4h NZoBi2HsHZVBC7ZhHd0navgldoq+QTZkQpgWUL/sJhGASrPZEfR5Rv8K0paTGxK9c0 Y3T4gdZ/nNJAUcPU+rXk1gqtAXLZo5+fHRbtFKUU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Mike Marshall , Stanislav Fort of Aisle Research , Sasha Levin Subject: [PATCH 6.6 293/529] orangefs: fix xattr related buffer overflow... Date: Fri, 21 Nov 2025 14:09:52 +0100 Message-ID: <20251121130241.452263580@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251121130230.985163914@linuxfoundation.org> References: <20251121130230.985163914@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mike Marshall [ Upstream commit 025e880759c279ec64d0f754fe65bf45961da864 ] Willy Tarreau forwarded me a message from Disclosure with the following warning: > The helper `xattr_key()` uses the pointer variable in the loop condition > rather than dereferencing it. As `key` is incremented, it remains non-NULL > (until it runs into unmapped memory), so the loop does not terminate on > valid C strings and will walk memory indefinitely, consuming CPU or hanging > the thread. I easily reproduced this with setfattr and getfattr, causing a kernel oops, hung user processes and corrupted orangefs files. Disclosure sent along a diff (not a patch) with a suggested fix, which I based this patch on. After xattr_key started working right, xfstest generic/069 exposed an xattr related memory leak that lead to OOM. xattr_key returns a hashed key. When adding xattrs to the orangefs xattr cache, orangefs used hash_add, a kernel hashing macro. hash_add also hashes the key using hash_log which resulted in additions to the xattr cache going to the wrong hash bucket. generic/069 tortures a single file and orangefs does a getattr for the xattr "security.capability" every time. Orangefs negative caches on xattrs which includes a kmalloc. Since adds to the xattr cache were going to the wrong bucket, every getattr for "security.capability" resulted in another kmalloc, none of which were ever freed. I changed the two uses of hash_add to hlist_add_head instead and the memory leak ceased and generic/069 quit throwing furniture. Signed-off-by: Mike Marshall Reported-by: Stanislav Fort of Aisle Research Signed-off-by: Sasha Levin --- fs/orangefs/xattr.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/fs/orangefs/xattr.c b/fs/orangefs/xattr.c index 68b62689a63e2..15738379f5511 100644 --- a/fs/orangefs/xattr.c +++ b/fs/orangefs/xattr.c @@ -54,7 +54,9 @@ static inline int convert_to_internal_xattr_flags(int setxattr_flags) static unsigned int xattr_key(const char *key) { unsigned int i = 0; - while (key) + if (!key) + return 0; + while (*key) i += *key++; return i % 16; } @@ -175,8 +177,8 @@ ssize_t orangefs_inode_getxattr(struct inode *inode, const char *name, cx->length = -1; cx->timeout = jiffies + orangefs_getattr_timeout_msecs*HZ/1000; - hash_add(orangefs_inode->xattr_cache, &cx->node, - xattr_key(cx->key)); + hlist_add_head( &cx->node, + &orangefs_inode->xattr_cache[xattr_key(cx->key)]); } } goto out_release_op; @@ -229,8 +231,8 @@ ssize_t orangefs_inode_getxattr(struct inode *inode, const char *name, memcpy(cx->val, buffer, length); cx->length = length; cx->timeout = jiffies + HZ; - hash_add(orangefs_inode->xattr_cache, &cx->node, - xattr_key(cx->key)); + hlist_add_head(&cx->node, + &orangefs_inode->xattr_cache[xattr_key(cx->key)]); } } -- 2.51.0