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* Two fixes hardening microcode data handling. (Quentin Casasnovas) 

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Merge tag 'microcode_fixes_for-3.21' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp into x86/urgent

Pull microcode fixes from Borislav Petkov:

  - Two fixes hardening microcode data handling. (Quentin Casasnovas)

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2015-02-19 13:32:42 +01:00
parent a267b0a349 35a9ff4eec
commit 1fbe23e0de
2 changed files with 10 additions and 1 deletions
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5
arch/x86/kernel/cpu/microcode/intel.c
View File

@ -196,6 +196,11 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
struct microcode_header_intel mc_header;
unsigned int mc_size;
if (leftover < sizeof(mc_header)) {
pr_err("error! Truncated header in microcode data file\n");
break;
}
if (get_ucode_data(&mc_header, ucode_ptr, sizeof(mc_header)))
break;

6
arch/x86/kernel/cpu/microcode/intel_early.c
View File

@ -321,7 +321,11 @@ get_matching_model_microcode(int cpu, unsigned long start,
unsigned int mc_saved_count = mc_saved_data->mc_saved_count;
int i;
while (leftover) {
while (leftover && mc_saved_count < ARRAY_SIZE(mc_saved_tmp)) {
if (leftover < sizeof(mc_header))
break;
mc_header = (struct microcode_header_intel *)ucode_ptr;
mc_size = get_totalsize(mc_header);