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perf arm-spe: Unaligned pointer work around

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Use get_unaligned_leXX instead of leXX_to_cpu to handle unaligned
pointers. Such pointers occur with libFuzzer testing.

A similar change for intel-pt was done in:
https://lore.kernel.org/r/20231005190451.175568-6-adrian.hunter@intel.com

Signed-off-by: Ian Rogers <irogers@google.com>
Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240514052402.3031871-1-irogers@google.com
This commit is contained in:
Ian Rogers 2024-05-13 22:24:02 -07:00 committed by Namhyung Kim
parent 678be1ca30
commit cbd446b4db
1 changed files with 5 additions and 18 deletions
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23
tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
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@ -10,24 +10,11 @@
#include <byteswap.h>
#include <linux/bitops.h>
#include <stdarg.h>
#include <linux/kernel.h>
#include <asm-generic/unaligned.h>
#include "arm-spe-pkt-decoder.h"
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define le16_to_cpu bswap_16
#define le32_to_cpu bswap_32
#define le64_to_cpu bswap_64
#define memcpy_le64(d, s, n) do { \
memcpy((d), (s), (n)); \
*(d) = le64_to_cpu(*(d)); \
} while (0)
#else
#define le16_to_cpu
#define le32_to_cpu
#define le64_to_cpu
#define memcpy_le64 memcpy
#endif
static const char * const arm_spe_packet_name[] = {
[ARM_SPE_PAD] = "PAD",
[ARM_SPE_END] = "END",
@ -70,9 +57,9 @@ static int arm_spe_get_payload(const unsigned char *buf, size_t len,
switch (payload_len) {
case 1: packet->payload = *(uint8_t *)buf; break;
case 2: packet->payload = le16_to_cpu(*(uint16_t *)buf); break;
case 4: packet->payload = le32_to_cpu(*(uint32_t *)buf); break;
case 8: packet->payload = le64_to_cpu(*(uint64_t *)buf); break;
case 2: packet->payload = get_unaligned_le16(buf); break;
case 4: packet->payload = get_unaligned_le32(buf); break;
case 8: packet->payload = get_unaligned_le64(buf); break;
default: return ARM_SPE_BAD_PACKET;
}