Commit-ID: 51776fb805fe4f248f264c1783c286ae60552e9a Gitweb: https://git.kernel.org/tip/51776fb805fe4f248f264c1783c286ae60552e9a Author: Borislav Petkov <b...@suse.de> AuthorDate: Thu, 26 Jul 2018 06:50:44 +0200 Committer: Borislav Petkov <b...@suse.de> CommitDate: Mon, 19 Nov 2018 10:51:05 +0100
x86/microcode/AMD: Move patch family check to verify_patch() ... where all the microcode patch verification is being concentrated. Signed-off-by: Borislav Petkov <b...@suse.de> Cc: x...@kernel.org Link: https://lkml.kernel.org/r/20181107170218.7596-9...@alien8.de --- arch/x86/kernel/cpu/microcode/amd.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c index b4450374f4b1..be46e1fda77f 100644 --- a/arch/x86/kernel/cpu/microcode/amd.c +++ b/arch/x86/kernel/cpu/microcode/amd.c @@ -221,7 +221,10 @@ __verify_patch_size(u8 family, u32 sh_psize, unsigned int buf_size) static unsigned int verify_patch(u8 family, const u8 *buf, unsigned int buf_size, bool early) { + struct microcode_header_amd *mc_hdr; u32 sh_psize; + u16 proc_id; + u8 patch_fam; if (!__verify_patch_section(buf, buf_size, &sh_psize, early)) return 0; @@ -243,6 +246,13 @@ verify_patch(u8 family, const u8 *buf, unsigned int buf_size, bool early) return 0; } + mc_hdr = (struct microcode_header_amd *)(buf + SECTION_HDR_SIZE); + proc_id = mc_hdr->processor_rev_id; + + patch_fam = 0xf + (proc_id >> 12); + if (patch_fam != family) + return 0; + return __verify_patch_size(family, sh_psize, buf_size); } @@ -718,7 +728,6 @@ static int verify_and_add_patch(u8 family, u8 *fw, unsigned int leftover) struct microcode_header_amd *mc_hdr; unsigned int patch_size, crnt_size; struct ucode_patch *patch; - u8 patch_fam; u16 proc_id; patch_size = verify_patch(family, fw, leftover, false); @@ -732,10 +741,6 @@ static int verify_and_add_patch(u8 family, u8 *fw, unsigned int leftover) mc_hdr = (struct microcode_header_amd *)(fw + SECTION_HDR_SIZE); proc_id = mc_hdr->processor_rev_id; - patch_fam = 0xf + (proc_id >> 12); - if (patch_fam != family) - return crnt_size; - if (mc_hdr->nb_dev_id || mc_hdr->sb_dev_id) { pr_err("Patch-ID 0x%08x: chipset-specific code unsupported.\n", mc_hdr->patch_id);
