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    Subject[PATCH 24/37] perf jit: Check JITHEADER_VERSION
    Date
    From: Stefano Sanfilippo <ssanfilippo@chromium.org>

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

    Signed-off-by: Stefano Sanfilippo <ssanfilippo@chromium.org>
    Signed-off-by: Ross McIlroy <rmcilroy@chromium.org>
    Reviewed-by: Stephane Eranian <eranian@google.com>
    Cc: Anton Blanchard <anton@ozlabs.org>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Link: http://lkml.kernel.org/r/1476356383-30100-9-git-send-email-eranian@google.com
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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 6a2688da3c4a..c9a941ef0f6d 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);
    --
    2.7.4
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