linux-kernel - [PATCH 8/9] perf/jit: Check JITHEADER

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Message-Id: <1476356383-30100-9-git-send-email-eranian@google.com>
Date:   Thu, 13 Oct 2016 03:59:42 -0700
From:   Stephane Eranian <eranian@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     acme@...nel.org, jolsa@...hat.com, peterz@...radead.org,
        mingo@...e.hu, anton@...abs.org, namhyung@...nel.org,
        Stefano Sanfilippo <ssanfilippo@...omium.org>,
        Ross McIlroy <rmcilroy@...omium.org>
Subject: [PATCH 8/9] perf/jit: Check JITHEADER_VERSION

From: Stefano Sanfilippo <ssanfilippo@...omium.org>

Check the version number when opening a jitdump file.
Accept older versions, but not newer ones.

Signed-off-by: Stefano Sanfilippo <ssanfilippo@...omium.org>
Signed-off-by: Ross McIlroy <rmcilroy@...omium.org>
Reviewed-by: Stephane Eranian <eranian@...gle.com>
---
 tools/perf/util/jitdump.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/perf/util/jitdump.c b/tools/perf/util/jitdump.c
index c47fba63274b..c5dabb3a81fd 100644
--- a/tools/perf/util/jitdump.c
+++ b/tools/perf/util/jitdump.c
@@ -180,6 +180,12 @@ jit_open(struct jit_buf_desc *jd, const char *name)
 			header.elf_mach,
 			jd->use_arch_timestamp);
 
+	if (header.version > JITHEADER_VERSION) {
+	  pr_err("wrong jitdump version %u, expected " STR(JITHEADER_VERSION),
+		 header.version);
+	  goto error;
+	}
+
 	if (header.flags & JITDUMP_FLAGS_RESERVED) {
 		pr_err("jitdump file contains invalid or unsupported flags 0x%llx\n",
 		       (unsigned long long)header.flags & JITDUMP_FLAGS_RESERVED);
-- 
1.9.1