diff options
| author | Pawel Moll <pawel.moll@arm.com> | 2014-06-13 16:03:32 +0100 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2014-11-27 11:22:03 +0000 |
| commit | df9e5a37fa4c29fb571551341e3172ca3d737cf5 (patch) | |
| tree | 9acd491c1e6ee887d9ab7a67c9471beff8ae89ec /include/linux/memory.h | |
| parent | 481518187e624e12fd4f391fda26f98a8758adb9 (diff) | |
perf: Handle compat ioctl
commit b3f207855f57b9c8f43a547a801340bb5cbc59e5 upstream.
When running a 32-bit userspace on a 64-bit kernel (eg. i386
application on x86_64 kernel or 32-bit arm userspace on arm64
kernel) some of the perf ioctls must be treated with special
care, as they have a pointer size encoded in the command.
For example, PERF_EVENT_IOC_ID in 32-bit world will be encoded
as 0x80042407, but 64-bit kernel will expect 0x80082407. In
result the ioctl will fail returning -ENOTTY.
This patch solves the problem by adding code fixing up the
size as compat_ioctl file operation.
Reported-by: Drew Richardson <drew.richardson@arm.com>
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1402671812-9078-1-git-send-email-pawel.moll@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Diffstat (limited to 'include/linux/memory.h')
0 files changed, 0 insertions, 0 deletions