diff options
| author | Aaron Durbin <adurbin@chromium.org> | 2014-03-07 15:23:05 -0600 |
|---|---|---|
| committer | Aaron Durbin <adurbin@google.com> | 2014-03-13 05:31:49 +0100 |
| commit | a31ff73e8de60ca6ac61a724f8c7649a1034176f (patch) | |
| tree | 2ae7c621f59f7f70924231e4c8d4e77ac295ec1b | |
| parent | b1b5118c717d673506292dced272a0837612fc17 (diff) | |
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>
| -rw-r--r-- | util/cbfstool/elfheaders.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/util/cbfstool/elfheaders.c b/util/cbfstool/elfheaders.c index 3af82a6ce6..505af78aa9 100644 --- a/util/cbfstool/elfheaders.c +++ b/util/cbfstool/elfheaders.c @@ -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. */ 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); + /* 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; } @@ -296,9 +303,16 @@ shdr_read(const struct buffer *in, Elf64_Ehdr *ehdr, struct xdr *xdr, int bit64) /* gather up all the shdrs. */ 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); + /* 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; } |