linux-kernel - [PATCH] exec: don't turn PF_KTHREAD off when command not found

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 for Android: free password hash cracker in your pocket

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

Date:	Thu,  9 Sep 2010 18:03:30 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: [PATCH] exec: don't turn PF_KTHREAD off when command not found

Now, do_execve() turn PF_KTHREAD off before search_binary_handler().
It has theorical risk of PF_KTHREAD lost. When ENOEXEC case, we don't
have to turn PF_KTHREAD off.

This patch move this flag modification after founding execution file.

I guess this is only theorical issue because now any kthread don't
call do_execve() directly. but anyway fixing would be better.

Cc: Roland McGrath <roland@...hat.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
 fs/exec.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/fs/exec.c b/fs/exec.c
index ef8b9dc..81d0d06 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1011,7 +1011,7 @@ int flush_old_exec(struct linux_binprm * bprm)
 	bprm->mm = NULL;		/* We're using it now */
 	set_exec_mm(NULL);
 
-	current->flags &= ~PF_RANDOMIZE;
+	current->flags &= ~(PF_RANDOMIZE | PF_KTHREAD);
 	flush_thread();
 	current->personality &= ~bprm->per_clear;
 
@@ -1421,7 +1421,6 @@ int do_execve(const char * filename,
 	if (retval < 0)
 		goto out;
 
-	current->flags &= ~PF_KTHREAD;
 	retval = search_binary_handler(bprm,regs);
 	if (retval < 0)
 		goto out;
-- 
1.6.5.2



--
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/