diff options
Diffstat (limited to 'resources/libreboot/patch/kgpe-d16/0039-cpu-amd-car-Add-romstage-BSP-stack-overrun-detection.patch')
| -rw-r--r-- | resources/libreboot/patch/kgpe-d16/0039-cpu-amd-car-Add-romstage-BSP-stack-overrun-detection.patch | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/resources/libreboot/patch/kgpe-d16/0039-cpu-amd-car-Add-romstage-BSP-stack-overrun-detection.patch b/resources/libreboot/patch/kgpe-d16/0039-cpu-amd-car-Add-romstage-BSP-stack-overrun-detection.patch new file mode 100644 index 0000000..df6dee9 --- /dev/null +++ b/resources/libreboot/patch/kgpe-d16/0039-cpu-amd-car-Add-romstage-BSP-stack-overrun-detection.patch @@ -0,0 +1,57 @@ +From a3709a31c062419544a607dfbca9a18773dad673 Mon Sep 17 00:00:00 2001 +From: Timothy Pearson <kb9vqf@pearsoncomputing.net> +Date: Mon, 1 Jun 2015 23:58:59 -0500 +Subject: [PATCH 039/146] cpu/amd/car: Add romstage BSP stack overrun + detection + +--- + src/cpu/amd/car/cache_as_ram.inc | 6 +++++- + src/cpu/amd/car/post_cache_as_ram.c | 8 ++++++++ + 2 files changed, 13 insertions(+), 1 deletion(-) + +diff --git a/src/cpu/amd/car/cache_as_ram.inc b/src/cpu/amd/car/cache_as_ram.inc +index ec70f67..9b29932 100644 +--- a/src/cpu/amd/car/cache_as_ram.inc ++++ b/src/cpu/amd/car/cache_as_ram.inc +@@ -24,7 +24,7 @@ + #include <cpu/amd/mtrr.h> + + #define CacheSize CONFIG_DCACHE_RAM_SIZE +-#define CacheBase (0xd0000 - CacheSize) ++#define CacheBase CONFIG_DCACHE_RAM_BASE + #define CacheSizeBSPStack CONFIG_DCACHE_BSP_STACK_SIZE + #define CacheSizeBSPSlush CONFIG_DCACHE_BSP_STACK_SLUSH + +@@ -473,6 +473,10 @@ fam10_end_part1: + movl $(CacheBase + CacheSize), %eax + movl %eax, %esp + ++ /* Poison the lower stack boundary */ ++ movl $((CacheBase + CacheSize) - CacheSizeBSPStack), %eax ++ movl $0xdeadbeef, (%eax) ++ + post_code(0xa3) + + jmp CAR_FAM10_ap_out +diff --git a/src/cpu/amd/car/post_cache_as_ram.c b/src/cpu/amd/car/post_cache_as_ram.c +index e7a41e5..b4d185e 100644 +--- a/src/cpu/amd/car/post_cache_as_ram.c ++++ b/src/cpu/amd/car/post_cache_as_ram.c +@@ -110,6 +110,14 @@ void post_cache_as_ram(void) + void *resume_backup_memory = NULL; + uint32_t family = amd_fam1x_cpu_family(); + ++ /* Verify that the BSP didn't overrun the lower stack ++ * boundary during romstage execution ++ */ ++ volatile uint32_t *lower_stack_boundary; ++ lower_stack_boundary = (void *)((CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE) - CONFIG_STACK_SIZE); ++ if ((*lower_stack_boundary) != 0xdeadbeef) ++ printk(BIOS_WARNING, "BSP overran lower stack boundary. Undefined behaviour may result!\n"); ++ + struct romstage_handoff *handoff; + handoff = romstage_handoff_find_or_add(); + if (handoff != NULL) +-- +1.7.9.5 + |