diff options
author | Roland McGrath <roland@redhat.com> | 2007-01-26 09:56:49 +0100 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-01-26 22:50:58 +0100 |
commit | f47aef55d9a18945fcdd7fd6bf01121ce973b91b (patch) | |
tree | 69f5f6c1fd4ae27d18344ae4b33b5c7bd4b18699 /mm | |
parent | [PATCH] Add VM_ALWAYSDUMP (diff) | |
download | linux-f47aef55d9a18945fcdd7fd6bf01121ce973b91b.tar.xz linux-f47aef55d9a18945fcdd7fd6bf01121ce973b91b.zip |
[PATCH] i386 vDSO: use VM_ALWAYSDUMP
This patch fixes core dumps to include the vDSO vma, which is left out now.
It removes the special-case core writing macros, which were not doing the
right thing for the vDSO vma anyway. Instead, it uses VM_ALWAYSDUMP in the
vma; there is no need for the fixmap page to be installed. It handles the
CONFIG_COMPAT_VDSO case by making elf_core_dump use the fake vma from
get_gate_vma after real vmas in the same way the /proc/PID/maps code does.
This changes core dumps so they no longer include the non-PT_LOAD phdrs from
the vDSO. I made the change to add them in the first place, but in turned out
that nothing ever wanted them there since the advent of NT_AUXV. It's cleaner
to leave them out, and just let the phdrs inside the vDSO image speak for
themselves.
Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/memory.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index 5beb4b894c5a..ef09f0acb1d8 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2608,6 +2608,13 @@ static int __init gate_vma_init(void) gate_vma.vm_end = FIXADDR_USER_END; gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC; gate_vma.vm_page_prot = __P101; + /* + * Make sure the vDSO gets into every core dump. + * Dumping its contents makes post-mortem fully interpretable later + * without matching up the same kernel and hardware config to see + * what PC values meant. + */ + gate_vma.vm_flags |= VM_ALWAYSDUMP; return 0; } __initcall(gate_vma_init); |