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cbfstool: elfparsing: check segment and section regions 

While parsing the section and program headers ensure the
locations of their contents are within the elf file proper.

Change-Id: I856f7de45f82ac15977abc06e51bedb51c58dde1
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/5372
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
This commit is contained in:
Aaron Durbin 2014-03-07 15:23:05 -06:00 committed by Aaron Durbin
parent b1b5118c71
commit a31ff73e8d
1 changed files with 16 additions and 2 deletions
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18
util/cbfstool/elfheaders.c
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@ -272,9 +272,16 @@ phdr_read(const struct buffer *in, Elf64_Ehdr *ehdr, struct xdr *xdr, int bit64)
* than one loop over all the phdrs. * than one loop over all the phdrs.
*/ */
phdr = calloc(ehdr->e_phnum, sizeof(*phdr)); phdr = calloc(ehdr->e_phnum, sizeof(*phdr));
for (i = 0; i < ehdr->e_phnum; i++) for (i = 0; i < ehdr->e_phnum; i++) {
DEBUG("Parsing segment %d\n", i);
elf_phdr(&b, &phdr[i], ehdr->e_phentsize, xdr, bit64); elf_phdr(&b, &phdr[i], ehdr->e_phentsize, xdr, bit64);
/* Ensure the contents are valid within the elf file. */
if (check_size(in, phdr[i].p_offset, phdr[i].p_filesz,
"segment contents"))
return NULL;
}
return phdr; return phdr;
} }
@ -296,9 +303,16 @@ shdr_read(const struct buffer *in, Elf64_Ehdr *ehdr, struct xdr *xdr, int bit64)
/* gather up all the shdrs. */ /* gather up all the shdrs. */
shdr = calloc(ehdr->e_shnum, sizeof(*shdr)); shdr = calloc(ehdr->e_shnum, sizeof(*shdr));
for (i = 0; i < ehdr->e_shnum; i++) for (i = 0; i < ehdr->e_shnum; i++) {
DEBUG("Parsing section %d\n", i);
elf_shdr(&b, &shdr[i], ehdr->e_shentsize, xdr, bit64); elf_shdr(&b, &shdr[i], ehdr->e_shentsize, xdr, bit64);
/* Ensure the contents are valid within the elf file. */
if (check_size(in, shdr[i].sh_offset, shdr[i].sh_size,
"section contents"))
return NULL;
}
return shdr; return shdr;
} }