Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ef7320edb1dd2cf6c969d1dcef4a9499a42f24da
Commit: ef7320edb1dd2cf6c969d1dcef4a9499a42f24da
Parent: 7e8767dddf3ad863a7013c334392e09177b48e2c
Author: Michael Ellerman <[EMAIL PROTECTED]>
AuthorDate: Fri Jul 6 02:39:49 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Jul 6 10:23:43 2007 -0700
Fix elf_core_dump() when writing arch specific notes (spu coredumps)
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 <[EMAIL PROTECTED]>
Acked-by: Arnd Bergmann <[EMAIL PROTECTED]>
Acked-by: Benjamin Herrenschmidt <[EMAIL PROTECTED]>
Acked-by: Paul Mackerras <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
fs/binfmt_elf.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index fa8ea33..08e4414 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1499,6 +1499,9 @@ static int elf_core_dump(long signr, struct pt_regs
*regs, struct file *file)
#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, struct pt_regs
*regs, struct file *file)
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, struct pt_regs
*regs, struct file *file)
#ifdef ELF_CORE_WRITE_EXTRA_NOTES
ELF_CORE_WRITE_EXTRA_NOTES;
+ foffset += extra_notes_size;
#endif
/* write out the thread status notes section */
-
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