diff options
| -rw-r--r-- | drivers/platform/x86/intel/ifs/load.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel/ifs/load.c b/drivers/platform/x86/intel/ifs/load.c index 9fb71d38c819..cfbf62494c89 100644 --- a/drivers/platform/x86/intel/ifs/load.c +++ b/drivers/platform/x86/intel/ifs/load.c @@ -2,9 +2,72 @@ /* Copyright(c) 2022 Intel Corporation. */ #include <linux/firmware.h> +#include <asm/cpu.h> +#include <asm/microcode_intel.h> #include "ifs.h" +static int ifs_sanity_check(struct device *dev, + const struct microcode_header_intel *mc_header) +{ + unsigned long total_size, data_size; + u32 sum, *mc; + + total_size = get_totalsize(mc_header); + data_size = get_datasize(mc_header); + + if ((data_size + MC_HEADER_SIZE > total_size) || (total_size % sizeof(u32))) { + dev_err(dev, "bad ifs data file size.\n"); + return -EINVAL; + } + + if (mc_header->ldrver != 1 || mc_header->hdrver != 1) { + dev_err(dev, "invalid/unknown ifs update format.\n"); + return -EINVAL; + } + + mc = (u32 *)mc_header; + sum = 0; + for (int i = 0; i < total_size / sizeof(u32); i++) + sum += mc[i]; + + if (sum) { + dev_err(dev, "bad ifs data checksum, aborting.\n"); + return -EINVAL; + } + + return 0; +} + +static bool find_ifs_matching_signature(struct device *dev, struct ucode_cpu_info *uci, + const struct microcode_header_intel *shdr) +{ + unsigned int mc_size; + + mc_size = get_totalsize(shdr); + + if (!mc_size || ifs_sanity_check(dev, shdr) < 0) { + dev_err(dev, "ifs sanity check failure\n"); + return false; + } + + if (!intel_cpu_signatures_match(uci->cpu_sig.sig, uci->cpu_sig.pf, shdr->sig, shdr->pf)) { + dev_err(dev, "ifs signature, pf not matching\n"); + return false; + } + + return true; +} + +static bool ifs_image_sanity_check(struct device *dev, const struct microcode_header_intel *data) +{ + struct ucode_cpu_info uci; + + intel_cpu_collect_info(&uci); + + return find_ifs_matching_signature(dev, &uci, data); +} + /* * Load ifs image. Before loading ifs module, the ifs image must be located * in /lib/firmware/intel/ifs and named as {family/model/stepping}.{testname}. @@ -24,5 +87,8 @@ void ifs_load_firmware(struct device *dev) return; } + if (!ifs_image_sanity_check(dev, (struct microcode_header_intel *)fw->data)) + dev_err(dev, "ifs header sanity check failed\n"); + release_firmware(fw); } |