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| author | James Clark <james.clark@arm.com> | 2021-10-21 14:27:00 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-10-25 19:47:42 +0300 |
| commit | d4145960e52cf76c4150b790227f94d7bb7faf6a (patch) | |
| tree | 8558b4dacecc162ae2fe2411290adeaa4deb3edf /include/linux/overflow.h | |
| parent | e277ac28df1dc5d7496f598910a721bfce1d862a (diff) | |
| download | linux-d4145960e52cf76c4150b790227f94d7bb7faf6a.tar.xz | |
perf dso: Fix /proc/kcore access on 32 bit systems
Because _LARGEFILE64_SOURCE is set in perf, file offset sizes can be
64 bits. If a workflow needs to open /proc/kcore on a 32 bit system (for
example to decode Arm ETM kernel trace) then the size value will be
wrapped to 32 bits in the function file_size() at this line:
dso->data.file_size = st.st_size;
Setting the file_size member to be u64 fixes the issue and allows
/proc/kcore to be opened.
Reported-by: Denis Nikitin <denik@chromium.org>
Signed-off-by: James Clark <james.clark@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/20211021112700.112499-1-james.clark@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'include/linux/overflow.h')
0 files changed, 0 insertions, 0 deletions