linux/kernel/events
Pawel Moll b3f207855f perf: Handle compat ioctl
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>
2014-08-20 09:42:13 +02:00
..
callchain.c perf: Roll back callchain buffer refcount under the callchain mutex 2013-08-16 17:55:50 +02:00
core.c perf: Handle compat ioctl 2014-08-20 09:42:13 +02:00
hw_breakpoint.c hw_breakpoint: Introduce "struct bp_cpuinfo" 2013-06-20 17:58:57 +02:00
internal.h perf: Fix arch_perf_out_copy_user default 2013-11-06 12:34:25 +01:00
Makefile uprobes: Move to kernel/events/ 2012-02-22 11:08:00 +01:00
ring_buffer.c perf: Optimize ring-buffer write by depending on control dependencies 2013-12-11 15:53:22 +01:00
uprobes.c uprobes: Change unregister/apply to WARN() if uprobe/consumer is gone 2014-06-30 13:22:15 -04:00