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| author | Alan Modra <amodra@gmail.com> | 2020-03-05 09:42:41 +1030 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2020-03-05 11:15:55 +1030 |
| commit | 6f8f95b4c4785e053f96b473039e244473a85ee5 (patch) | |
| tree | f6c80cbe75bb317c3d13ac09e5d5359e2bd59327 /bfd/archive64.c | |
| parent | 8a7adb414e62495559f104bb9895df167d2298e1 (diff) | |
| download | gdb-6f8f95b4c4785e053f96b473039e244473a85ee5.zip gdb-6f8f95b4c4785e053f96b473039e244473a85ee5.tar.gz gdb-6f8f95b4c4785e053f96b473039e244473a85ee5.tar.bz2 | |
Large memory allocation reading fuzzed 64-bit archive
This patch adds a sanity check for the size of an armap.
* archive64.c (_bfd_archive_64_bit_slurp_armap): Check parsed_size
against file size before allocating memory. Use bfd_alloc rather
than bfd_zalloc for carsym/strings memory.
Diffstat (limited to 'bfd/archive64.c')
| -rw-r--r-- | bfd/archive64.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/bfd/archive64.c b/bfd/archive64.c index d4b0c3c..5e14439 100644 --- a/bfd/archive64.c +++ b/bfd/archive64.c @@ -47,6 +47,7 @@ _bfd_archive_64_bit_slurp_armap (bfd *abfd) bfd_byte *raw_armap = NULL; carsym *carsyms; bfd_size_type amt; + ufile_ptr filesize; ardata->symdefs = NULL; @@ -76,6 +77,13 @@ _bfd_archive_64_bit_slurp_armap (bfd *abfd) parsed_size = mapdata->parsed_size; free (mapdata); + filesize = bfd_get_file_size (abfd); + if (filesize != 0 && parsed_size > filesize) + { + bfd_set_error (bfd_error_malformed_archive); + return FALSE; + } + if (bfd_bread (int_buf, 8, abfd) != 8) { if (bfd_get_error () != bfd_error_system_call) @@ -102,7 +110,7 @@ _bfd_archive_64_bit_slurp_armap (bfd *abfd) bfd_set_error (bfd_error_malformed_archive); return FALSE; } - ardata->symdefs = (struct carsym *) bfd_zalloc (abfd, amt); + ardata->symdefs = (struct carsym *) bfd_alloc (abfd, amt); if (ardata->symdefs == NULL) return FALSE; carsyms = ardata->symdefs; |