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| author | Olof Johansson <olof@lixom.net> | 2010-12-10 11:09:23 +0300 |
|---|---|---|
| committer | Michal Marek <mmarek@suse.cz> | 2010-12-28 02:22:58 +0300 |
| commit | 731ece41fb1047816303295a0cdfed90a528137e (patch) | |
| tree | 432d7a12f14d6ca02fe139ed305c128885847de3 /scripts/mod | |
| parent | a3ba81131aca243bfecfa78c42edec0cd69f72d6 (diff) | |
| download | linux-731ece41fb1047816303295a0cdfed90a528137e.tar.xz | |
modpost: Fix address calculation in reloc_location()
This patch fixes a segfault in modpost that is observed when the gold
linker is used to link the input objects.
The problem is that reloc_location (modpost.c) is computing the
address of the relocation target incorrectly. Here, elf->hdr points
to the beginning of the ELF file in memory, sechdr points to the
relocation section header, section is the index of the section
being relocated, and sechdrs[section].sh_offset would be the offset
of that section, relative to the beginning of the ELF file. Adding
elf->hdr + sechdrs[section].sh_offset gives you the address of the
beginning of the section, and adding r->r_offset to that gives you the
address of the location to be relocated. You do not need to subtract
sechdrs[section].sh_addr from that -- the result of this is an address
outside the file, and causes the segfault when addend_386_rel tries to
dereference it.
This bug is not observed when GNU ld is used to link the inputs. The
object file ubuntu/omnibook/omnibook.o is the result of an ld -r of
several other files. When GNU ld does an ld -r, it sets the vaddr
field for each section to 0, but gold lays out the section addresses
sequentially instead:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .text PROGBITS 00000000 000034 004794 00 AX 0 0 4
[ 2] .data PROGBITS 0000b9d0 0047c8 0009c0 00 WA 0 0 4
[ 3] .bss NOBITS 000162f8 005188 00013c 00 WA 0 0 4
[ 4] .rodata.str1.1 PROGBITS 00004f2d 0052c4 001b1a 01 AMS 0 0 1
[ 5] .init.text PROGBITS 00004794 006dde 0005fa 00 AX 0 0 1
[ 6] .exit.text PROGBITS 00004d8e 0073d8 00018a 00 AX 0 0 1
...
So the bug in the tool remained undiscovered because the section's vaddr
always happened to be 0.
Signed-off-by: Raymes Khoury <raymes@google.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Michal Marek <mmarek@suse.cz>
Diffstat (limited to 'scripts/mod')
| -rw-r--r-- | scripts/mod/modpost.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index 194e2c453609..97d2259ae999 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -1442,7 +1442,7 @@ static unsigned int *reloc_location(struct elf_info *elf, int section = shndx2secindex(sechdr->sh_info); return (void *)elf->hdr + sechdrs[section].sh_offset + - r->r_offset - sechdrs[section].sh_addr; + r->r_offset; } static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |