| 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
| ||
|
Date: Mon, 17 Aug 2009 03:07:36 -0400 From: Amerigo Wang <amwang@...hat.com> To: linux-kernel@...r.kernel.org Cc: esandeen@...hat.com, eteo@...hat.com, eparis@...hat.com, Amerigo Wang <amwang@...hat.com>, linux-fsdevel@...r.kernel.org, akpm@...ux-foundation.org, sds@...ho.nsa.gov, hirofumi@...l.parknet.co.jp, viro@...iv.linux.org.uk Subject: [V4 Patch 0/2] fix file truncations when both suid and write permissions set When suid is set and the non-owner user has write permission, any writing into this file should be allowed and suid should be removed after that. However, current kernel only allows writing without truncations, when we do truncations on that file, we get EPERM. This is a bug. Steps to reproduce this bug: % ls -l rootdir/file1 -rwsrwsrwx 1 root root 3 Jun 25 15:42 rootdir/file1 % echo h > rootdir/file1 zsh: operation not permitted: rootdir/file1 % ls -l rootdir/file1 -rwsrwsrwx 1 root root 3 Jun 25 15:42 rootdir/file1 % echo h >> rootdir/file1 % ls -l rootdir/file1 -rwxrwxrwx 1 root root 5 Jun 25 16:34 rootdir/file1 This patch fixes it. Signed-off-by: WANG Cong <amwang@...hat.com> Andrew, these two patches can replace the -mm patch "vfs-allow-file-truncations-when-both-suid-and-write-permissions-set.patch". Thanks! -- 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/
Powered by blists - more mailing lists