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Date: Fri, 23 Nov 2012 16:17:00 -0000
From: Jan Kratochvil <jan.kratochvil@redhat.com>
To: Mark Kettenis <mark.kettenis@xs4all.nl>
Cc: palves@redhat.com, gdb-patches@sourceware.org
Subject: Re: [patch+7.5.1] Work around PR libc/13097 "linux-vdso.so.1" #3
Message-ID: <20121123161732.GA25593@host2.jankratochvil.net>
References: <20121122201737.GA32172@host2.jankratochvil.net> <50AF65E1.1090308@redhat.com> <20121123123952.GA15371@host2.jankratochvil.net> <50AF9DBF.1090406@redhat.com> <201211231612.qANGCXUC004949@glazunov.sibelius.xs4all.nl>
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On Fri, 23 Nov 2012 17:12:33 +0100, Mark Kettenis wrote:
> > My favorite is opening a DSO symlink like we /proc/PID/exe.
> 
> That doesn't really help.  If you replace the DSO the symlink will
> point at the new one, not the one loaded by the executable.

With Linux kernel it will work:

$ md5sum /tmp/sleep;/tmp/sleep 1h &p=$!;rm /tmp/sleep;ls -l /proc/$p/exe;md5sum /proc/$p/exe
85bde4e40576d0fd8172dd3b91822cff  /tmp/sleep
[1] 25677
lrwxrwxrwx 1 jkratoch jkratoch 0 Nov 23 17:17 /proc/25677/exe -> /tmp/sleep\ (deleted)
85bde4e40576d0fd8172dd3b91822cff  /proc/25677/exe


Jan