linux-kernel - [PATCH] proc: fix ->stack

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Message-ID: <20091028115602.GA26295@x200>
Date:	Wed, 28 Oct 2009 14:56:02 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	akpm@...ux-foundation.org
Cc:	m.s.tsirkin@...il.com, linux-kernel@...r.kernel.org,
	stefani@...bold.net
Subject: [PATCH] proc: fix ->stack_start in compat mode

Assign tsk->stack_start even when doing compat execve(2).

As side effect, fix segfault inside boehm-gc library.
http://bugzilla.kernel.org/show_bug.cgi?id=14478

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

 Michael, please, confirm.

 Stefani, I get "Stack usage: 0 kB", you may want to look at it.

 fs/compat.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1532,6 +1532,8 @@ int compat_do_execve(char * filename,
 	if (retval < 0)
 		goto out;
 
+	current->stack_start = current->mm->start_stack;
+
 	/* execve succeeded */
 	current->fs->in_exec = 0;
 	current->in_execve = 0;
--
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