linux-kernel - Re: [PATCH]: allow individual core dump methods to be unlimited when sending to a pipe

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Date:	Tue, 24 Jul 2007 02:09:39 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Neil Horman <nhorman@...driver.com>
Cc:	linux-kernel@...r.kernel.org, wwoods@...hat.com
Subject: Re: [PATCH]: allow individual core dump methods to be unlimited
 when sending to a pipe

On Sun, 22 Jul 2007 11:39:47 -0400 Neil Horman <nhorman@...driver.com> wrote:

> 	This is a follow on to the patch entitled:
> update-coredump-path-in-kernel-to-not-check-coredump-rlim-if-core_pattern-is-a-pipe.patch
> It allows individual core dump methods to have the core dump size limit passed
> into them.  Its more efficient than each method having to retrieve it on their
> own, and it allows for do_coredump to specify a infinite limit in the event that
> a pipe is configured in /proc/sys/kernel/core_pattern, in which case ulimit -c
> should not apply.

Needed this warning fix:

fs/exec.c: In function 'do_coredump':
fs/exec.c:1761: warning: large integer implicitly truncated to unsigned type

diff -puN fs/exec.c~allow-individual-core-dump-methods-to-be-unlimited-when-sending-to-a-pipe-fix fs/exec.c
--- a/fs/exec.c~allow-individual-core-dump-methods-to-be-unlimited-when-sending-to-a-pipe-fix
+++ a/fs/exec.c
@@ -1703,7 +1703,7 @@ int do_coredump(long signr, int exit_cod
 	int fsuid = current->fsuid;
 	int flag = 0;
 	int ispipe = 0;
-	u32 core_limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
+	unsigned long core_limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
 
 	audit_core_dumps(signr);
 
_

which makes me worry about how much care was taken here on 32/64 issues,
and crsos-arch issues (the underlying type for compat_ulong_t, for one).

Could you please go over it with a toothcomb, see if there are any other
slipups there?


Thanks.
-
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