Messages in this thread Patch in this message | | | Subject | [PATCH] x86 microcode: don't check the size | From | Shaohua Li <> | Date | Thu, 07 Sep 2006 10:47:07 +0800 |
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IA32 manual says if micorcode update's size is 0, then the size is default size (2048 bytes). But this doesn't suggest all microcode update's size should be above 2048 bytes to me. We actually had a microcode update whose size is 1024 bytes. The patch just removed the check.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
--- work/src/linux-2.6.18-rc5-mm1/arch/i386/kernel/microcode.c | 14 ++----------- 1 files changed, 3 insertions(+), 11 deletions(-)
Index: root/work/src/linux-2.6.18-rc5-mm1/arch/i386/kernel/microcode.c =================================================================== --- root.orig/work/src/linux-2.6.18-rc5-mm1/arch/i386/kernel/microcode.c 2006-09-06 06:51:03.000000000 +0800 +++ root/work/src/linux-2.6.18-rc5-mm1/arch/i386/kernel/microcode.c 2006-09-06 08:20:35.000000000 +0800 @@ -187,8 +187,7 @@ static int microcode_sanity_check(void * total_size = get_totalsize(mc_header); data_size = get_datasize(mc_header); - if ((data_size + MC_HEADER_SIZE > total_size) - || (data_size < DEFAULT_UCODE_DATASIZE)) { + if (data_size + MC_HEADER_SIZE > total_size) { printk(KERN_ERR "microcode: error! " "Bad data size in microcode data file\n"); return -EINVAL; @@ -365,8 +364,7 @@ static long get_next_ucode(void **mc, lo return -EFAULT; } total_size = get_totalsize(&mc_header); - if ((offset + total_size > user_buffer_size) - || (total_size < DEFAULT_UCODE_TOTALSIZE)) { + if (offset + total_size > user_buffer_size) { printk(KERN_ERR "microcode: error! Bad total size in microcode " "data file\n"); return -EINVAL; @@ -432,11 +430,6 @@ static ssize_t microcode_write (struct f { ssize_t ret; - if (len < DEFAULT_UCODE_TOTALSIZE) { - printk(KERN_ERR "microcode: not enough data\n"); - return -EINVAL; - } - if ((len >> PAGE_SHIFT) > num_physpages) { printk(KERN_ERR "microcode: too much data (max %ld pages)\n", num_physpages); return -EINVAL; @@ -508,8 +501,7 @@ static long get_next_ucode_from_buffer(v mc_header = (microcode_header_t *)(buf + offset); total_size = get_totalsize(mc_header); - if ((offset + total_size > size) - || (total_size < DEFAULT_UCODE_TOTALSIZE)) { + if (offset + total_size > size) { printk(KERN_ERR "microcode: error! Bad data in microcode data file\n"); return -EINVAL; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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