diff options
| author | John Zhao <john.zhao@intel.com> | 2020-08-04 11:29:08 -0700 |
|---|---|---|
| committer | Philipp Deppenwiese <zaolin.daisuki@gmail.com> | 2020-08-06 11:52:21 +0000 |
| commit | 536e9651edb1b05ff417f323b9cd7294cf20e692 (patch) | |
| tree | 2d4c067a53388a01269c2ef1a69e0be83b464492 /src/security/intel/txt/common.c | |
| parent | fc24da940dfe3d02c49d0612c5ac42a2cea1590f (diff) | |
security/intel/txt: Avoid shifting by a negative value
Coverity detects an integer handling issue with BAD_SHIFT. The inline
function log2_ceil(u32 x) { return (x == 0) ? -1 : log2(x * 2 - 1); }
could return -1, which causes shifting by a negative amount value and
has undefined behavior. Add sanity check for the acm_header->size to
avoid shifting negative value.
Found-by: Coverity CID 1431124
TEST=None
Signed-off-by: John Zhao <john.zhao@intel.com>
Change-Id: Ic687349b14917e39d2a8186968037ca2521c7cdc
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44186
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Diffstat (limited to 'src/security/intel/txt/common.c')
| -rw-r--r-- | src/security/intel/txt/common.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/security/intel/txt/common.c b/src/security/intel/txt/common.c index d3e18376a5..f16bbea141 100644 --- a/src/security/intel/txt/common.c +++ b/src/security/intel/txt/common.c @@ -149,6 +149,9 @@ static int validate_acm(const void *ptr) if (acm_header->module_vendor != INTEL_ACM_VENDOR) return ACM_E_MODULE_VENDOR_NOT_INTEL; + if (acm_header->size == 0) + return ACM_E_SIZE_INCORRECT; + if (((acm_header->header_len + acm_header->scratch_size) * sizeof(uint32_t) + sizeof(struct acm_info_table)) > (acm_header->size & 0xffffff) * sizeof(uint32_t)) { return ACM_E_SIZE_INCORRECT; |