[PATCH 2/2] perf/x86/regs: Check reserved bits

[kan.liang@linux.intel.com]

From: Kan Liang <kan.liang@linux.intel.com>

The perf fuzzer triggers a warning which map to:

	if (WARN_ON_ONCE(idx >= ARRAY_SIZE(pt_regs_offset)))
		return 0;

The bits between XMM registers and generic registers are reserved.
But perf_reg_validate() doesn't check these bits.

Add REG_RESERVED for reserved bits.
Check the reserved bits in perf_reg_validate().

Fixes: 878068ea270e ("perf/x86: Support outputting XMM registers")
Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---
 arch/x86/kernel/perf_regs.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/perf_regs.c b/arch/x86/kernel/perf_regs.c
index 86ffe5a..3f8c1fc 100644
--- a/arch/x86/kernel/perf_regs.c
+++ b/arch/x86/kernel/perf_regs.c
@@ -79,6 +79,9 @@ u64 perf_reg_value(struct pt_regs *regs, int idx)
 	return regs_get_register(regs, pt_regs_offset[idx]);
 }
 
+#define REG_RESERVED	(((1ULL << PERF_REG_X86_XMM0) - 1) & \
+			~((1ULL << PERF_REG_X86_MAX) - 1))
+
 #ifdef CONFIG_X86_32
 #define REG_NOSUPPORT ((1ULL << PERF_REG_X86_R8) | \
 		       (1ULL << PERF_REG_X86_R9) | \
@@ -91,7 +94,7 @@ u64 perf_reg_value(struct pt_regs *regs, int idx)
 
 int perf_reg_validate(u64 mask)
 {
-	if (!mask || (mask & REG_NOSUPPORT))
+	if (!mask || (mask & (REG_NOSUPPORT | REG_RESERVED)))
 		return -EINVAL;
 
 	return 0;
@@ -117,7 +120,7 @@ void perf_get_regs_user(struct perf_regs *regs_user,
 
 int perf_reg_validate(u64 mask)
 {
-	if (!mask || (mask & REG_NOSUPPORT))
+	if (!mask || (mask & (REG_NOSUPPORT | REG_RESERVED)))
 		return -EINVAL;
 
 	return 0;
-- 
2.7.4