The patch titled
Fix elf_core_dump() when writing arch specific notes (spu coredumps)
has been added to the -mm tree. Its filename is
fix-elf_core_dump-when-writing-arch-specific-notes-spu-coredumps.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Fix elf_core_dump() when writing arch specific notes (spu coredumps)
From: Michael Ellerman <michael@xxxxxxxxxxxxxx>
elf_core_dump() supports dumping arch specific ELF notes, via the #define
ELF_CORE_WRITE_EXTRA_NOTES. Currently the only user of this is the powerpc
spu coredump code.
There is a bug in the handling of foffset WRT the arch notes, which causes
us to erroneously increment foffset by the size of the arch notes, leaving
a block of zeroes in the file, and causing all subsequent data in the file
to be at <supposed position> + <arch note size>. eg:
LOAD 0x050000 0x00100000 0x00000000 0x20000 0x20000 R E 0x10000
Tells us we should have a chunk of data at 0x50000. The truth is the data
is at 0x90dbc = 0x50000 + 0x40dbc (the size of the arch notes).
This bug prevents gdb from reading the core file correctly.
The simplest fix is to simply remember the size of the arch notes, and add
it to foffset after we've written the arch notes. The only drawback is
that if the arch code doesn't write as many bytes as it said it would, we
end up with a broken core dump again. For now I think that's a reasonable
requirement.
Tested on a Cell blade, gdb no longer complains about the core file being
bogus.
While I'm here I should point out that the spu coredump code does not work
if we're dumping to a pipe - we'll have to wait for 23 to fix that.
Signed-off-by: Michael Ellerman <michael@xxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/binfmt_elf.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff -puN fs/binfmt_elf.c~fix-elf_core_dump-when-writing-arch-specific-notes-spu-coredumps fs/binfmt_elf.c
--- a/fs/binfmt_elf.c~fix-elf_core_dump-when-writing-arch-specific-notes-spu-coredumps
+++ a/fs/binfmt_elf.c
@@ -1499,6 +1499,9 @@ static int elf_core_dump(long signr, str
#endif
int thread_status_size = 0;
elf_addr_t *auxv;
+#ifdef ELF_CORE_WRITE_EXTRA_NOTES
+ int extra_notes_size;
+#endif
/*
* We no longer stop all VM operations.
@@ -1628,7 +1631,8 @@ static int elf_core_dump(long signr, str
sz += thread_status_size;
#ifdef ELF_CORE_WRITE_EXTRA_NOTES
- sz += ELF_CORE_EXTRA_NOTES_SIZE;
+ extra_notes_size = ELF_CORE_EXTRA_NOTES_SIZE;
+ sz += extra_notes_size;
#endif
fill_elf_note_phdr(&phdr, sz, offset);
@@ -1674,6 +1678,7 @@ static int elf_core_dump(long signr, str
#ifdef ELF_CORE_WRITE_EXTRA_NOTES
ELF_CORE_WRITE_EXTRA_NOTES;
+ foffset += extra_notes_size;
#endif
/* write out the thread status notes section */
_
Patches currently in -mm which might be from michael@xxxxxxxxxxxxxx are
origin.patch
fix-elf_core_dump-when-writing-arch-specific-notes-spu-coredumps.patch
git-powerpc.patch
jprobes-make-struct-jprobeentry-a-void.patch
jprobes-remove-jprobe_entry.patch
jprobes-make-jprobes-a-little-safer-for-users.patch
jprobes-make-jprobes-a-little-safer-for-users-fix.patch
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