diff options
| author | Ram Pai <[email protected]> | 2018-12-20 12:03:30 -0800 |
|---|---|---|
| committer | Michael Ellerman <[email protected]> | 2018-12-21 14:46:50 +1100 |
| commit | 2cd4bd192ee94848695c1c052d87913260e10f36 (patch) | |
| tree | 196e1d7a1fb878dae550092bc739c5ac5e4318db /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | 2f07229f02d4c55affccd11a61af4fd4b94dc436 (diff) | |
powerpc/pkeys: Fix handling of pkey state across fork()
Protection key tracking information is not copied over to the
mm_struct of the child during fork(). This can cause the child to
erroneously allocate keys that were already allocated. Any allocated
execute-only key is lost aswell.
Add code; called by dup_mmap(), to copy the pkey state from parent to
child explicitly.
This problem was originally found by Dave Hansen on x86, which turns
out to be a problem on powerpc aswell.
Fixes: cf43d3b26452 ("powerpc: Enable pkey subsystem")
Cc: [email protected] # v4.16+
Reviewed-by: Thiago Jung Bauermann <[email protected]>
Signed-off-by: Ram Pai <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions