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x86, microcode, AMD: Fix section header size check

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The ucode size check has to take the section header size into account
too when sanity checking the section length. Shorten and clarify define
names, while at it.

Caught-by: Ben Hutchings <ben@decadent.org.uk>
Link: http://lkml.kernel.org/r/1302752223.5282.674.camel@localhost
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
This commit is contained in:
Borislav Petkov 2011-06-15 15:34:57 +02:00
parent 86b445676d
commit 40b7f3dfcc
1 changed files with 8 additions and 7 deletions
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15
arch/x86/kernel/microcode_amd.c
View file

@ -66,8 +66,8 @@ struct microcode_amd {
unsigned int mpb[0];
};
#define UCODE_CONTAINER_SECTION_HDR 8
#define UCODE_CONTAINER_HEADER_SIZE 12
#define SECTION_HDR_SIZE 8
#define CONTAINER_HDR_SZ 12
static struct equiv_cpu_entry *equiv_cpu_table;
@ -177,7 +177,7 @@ static unsigned int verify_ucode_size(int cpu, const u8 *buf, unsigned int size)
actual_size = *(u32 *)(buf + 4);
if (actual_size > size || actual_size > max_size) {
if (actual_size + SECTION_HDR_SIZE > size || actual_size > max_size) {
pr_err("section size mismatch\n");
return 0;
}
@ -204,8 +204,8 @@ get_next_ucode(int cpu, const u8 *buf, unsigned int size, unsigned int *mc_size)
if (!mc)
goto out;
get_ucode_data(mc, buf + UCODE_CONTAINER_SECTION_HDR, actual_size);
*mc_size = actual_size + UCODE_CONTAINER_SECTION_HDR;
get_ucode_data(mc, buf + SECTION_HDR_SIZE, actual_size);
*mc_size = actual_size + SECTION_HDR_SIZE;
out:
return mc;
@ -229,9 +229,10 @@ static int install_equiv_cpu_table(const u8 *buf)
return -ENOMEM;
}
get_ucode_data(equiv_cpu_table, buf + UCODE_CONTAINER_HEADER_SIZE, size);
get_ucode_data(equiv_cpu_table, buf + CONTAINER_HDR_SZ, size);
return size + UCODE_CONTAINER_HEADER_SIZE; /* add header length */
/* add header length */
return size + CONTAINER_HDR_SZ;
}
static void free_equiv_cpu_table(void)