linux-kernel - [025/116] coredump: suppress uid comparison test if core output files are pipes

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: <20100330225613.865124516@linux.site>
Date:	Tue, 30 Mar 2010 15:55:03 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Neil Horman <nhorman@...driver.com>,
	Andi Kleen <andi@...stfloor.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>, Ingo Molnar <mingo@...e.hu>,
	maximilian attems <max@...o.at>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [025/116] coredump: suppress uid comparison test if core output files are pipes

2.6.32-stable review patch.  If anyone has any objections, please let us know.

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

From: Neil Horman <nhorman@...driver.com>

commit 76595f79d76fbe6267a51b3a866a028d150f06d4 upstream.

Modify uid check in do_coredump so as to not apply it in the case of
pipes.

This just got noticed in testing.  The end of do_coredump validates the
uid of the inode for the created file against the uid of the crashing
process to ensure that no one can pre-create a core file with different
ownership and grab the information contained in the core when they
shouldn' tbe able to.  This causes failures when using pipes for a core
dumps if the crashing process is not root, which is the uid of the pipe
when it is created.

The fix is simple.  Since the check for matching uid's isn't relevant for
pipes (a process can't create a pipe that the uermodehelper code will open
anyway), we can just just skip it in the event ispipe is non-zero

Reverts a pipe-affecting change which was accidentally made in

: commit c46f739dd39db3b07ab5deb4e3ec81e1c04a91af
: Author:     Ingo Molnar <mingo@...e.hu>
: AuthorDate: Wed Nov 28 13:59:18 2007 +0100
: Commit:     Linus Torvalds <torvalds@...dy.linux-foundation.org>
: CommitDate: Wed Nov 28 10:58:01 2007 -0800
:
:     vfs: coredumping fix

Signed-off-by: Neil Horman <nhorman@...driver.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: maximilian attems <max@...o.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/exec.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1913,8 +1913,9 @@ void do_coredump(long signr, int exit_co
 	/*
 	 * Dont allow local users get cute and trick others to coredump
 	 * into their pre-created files:
+	 * Note, this is not relevant for pipes
 	 */
-	if (inode->i_uid != current_fsuid())
+	if (!ispipe && (inode->i_uid != current_fsuid()))
 		goto close_fail;
 	if (!file->f_op)
 		goto close_fail;


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/