linux-kernel - Re: [PATCH 3/4] prctl: move MMF_EXE_FILE_CHANGED into exe

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Message-ID: <1426385580.28068.74.camel@stgolabs.net>
Date:	Sat, 14 Mar 2015 19:13:00 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	akpm@...ux-foundation.org
Cc:	viro@...iv.linux.org.uk, gorcunov@...nvz.org, oleg@...hat.com,
	koct9i@...il.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] prctl: move MMF_EXE_FILE_CHANGED into exe_file
 struct

On Sat, 2015-03-14 at 15:39 -0700, Davidlohr Bueso wrote:
> +	if (test_and_set_mm_exe_file(mm, exefd.file))
> +		return 0;
> +	return -EPERM;

Bah, this is obviously bogus. We'd need the following folded in:

diff --git a/kernel/sys.c b/kernel/sys.c
index a82d0c4..41b27bd 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1694,8 +1694,8 @@ set_file:
         * This grabs a reference to exefd.file.
         */
        if (test_and_set_mm_exe_file(mm, exefd.file))
-               return 0;
-       return -EPERM;
+               return -EPERM;
+       return 0;
 }


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