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authorAaron Durbin <adurbin@chromium.org>2017-06-12 12:48:38 -0500
committerAaron Durbin <adurbin@chromium.org>2017-06-13 20:03:16 +0200
commitd9762f70acc1cc2db5b3905756f5f5a995b9a21a (patch)
treebbc2f43c641ebd839358217ffdac963b9923cc81 /src/cpu
parente1058c7c996fa70e6a82d5709cba6f2b836f0e18 (diff)
cpu/x86/mtrr: fail early if solution exceeds available MTRRs
If an MTRR solution exceeds the number of available MTRRs don't attempt to commit the result. It will just GP fault with the MSR write to an invalid MSR address. Change-Id: I5c4912d5244526544c299c3953bca1bf884b34d5 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/20163 Reviewed-by: Youness Alaoui <snifikino@gmail.com> Reviewed-by: Furquan Shaikh <furquan@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
Diffstat (limited to 'src/cpu')
-rw-r--r--src/cpu/x86/mtrr/mtrr.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/src/cpu/x86/mtrr/mtrr.c b/src/cpu/x86/mtrr/mtrr.c
index e7c69be482..609d1e76db 100644
--- a/src/cpu/x86/mtrr/mtrr.c
+++ b/src/cpu/x86/mtrr/mtrr.c
@@ -751,10 +751,16 @@ static void prepare_var_mtrrs(struct memranges *addr_space, int def_type,
sol->num_used = var_state.mtrr_index;
}
-static void commit_var_mtrrs(const struct var_mtrr_solution *sol)
+static int commit_var_mtrrs(const struct var_mtrr_solution *sol)
{
int i;
+ if (sol->num_used > total_mtrrs) {
+ printk(BIOS_WARNING, "Not enough MTRRs: %d vs %d\n",
+ sol->num_used, total_mtrrs);
+ return -1;
+ }
+
/* Write out the variable MTRRs. */
disable_cache();
for (i = 0; i < sol->num_used; i++) {
@@ -767,6 +773,7 @@ static void commit_var_mtrrs(const struct var_mtrr_solution *sol)
enable_var_mtrr(sol->mtrr_default_type);
enable_cache();
+ return 0;
}
void x86_setup_var_mtrrs(unsigned int address_bits, unsigned int above4gb)
@@ -872,10 +879,15 @@ void mtrr_use_temp_range(uintptr_t begin, size_t size, int type)
calc_var_mtrrs(&addr_space, above4gb, address_bits);
prepare_var_mtrrs(&addr_space, sol.mtrr_default_type,
above4gb, address_bits, &sol);
- commit_var_mtrrs(&sol);
+
+ if (commit_var_mtrrs(&sol) < 0)
+ printk(BIOS_WARNING, "Unable to insert temporary MTRR range: 0x%016llx - 0x%016llx size 0x%08llx type %d\n",
+ (long long)begin, (long long)begin + size,
+ (long long)size, type);
+ else
+ put_back_original_solution = true;
memranges_teardown(&addr_space);
- put_back_original_solution = true;
}
static void remove_temp_solution(void *unused)