diff options
author | Laurent Dufour <[email protected]> | 2017-09-04 10:32:15 +0200 |
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committer | Thomas Gleixner <[email protected]> | 2017-09-25 09:36:15 +0200 |
commit | a3c4fb7c9c2ebfd50b8c60f6c069932bb319bc37 (patch) | |
tree | 5c1a69a19be964e795c8ed0b3ff9691f08905420 /tools/perf/scripts/python/export-to-sqlite.py | |
parent | 10430364ebb562311ba6a6efa74e0c2298007912 (diff) |
x86/mm: Fix fault error path using unsafe vma pointer
commit 7b2d0dbac489 ("x86/mm/pkeys: Pass VMA down in to fault signal
generation code") passes down a vma pointer to the error path, but that is
done once the mmap_sem is released when calling mm_fault_error() from
__do_page_fault().
This is dangerous as the vma structure is no more safe to be used once the
mmap_sem has been released. As only the protection key value is required in
the error processing, we could just pass down this value.
Fix it by passing a pointer to a protection key value down to the fault
signal generation code. The use of a pointer allows to keep the check
generating a warning message in fill_sig_info_pkey() when the vma was not
known. If the pointer is valid, the protection value can be accessed by
deferencing the pointer.
[ tglx: Made *pkey u32 as that's the type which is passed in siginfo ]
Fixes: 7b2d0dbac489 ("x86/mm/pkeys: Pass VMA down in to fault signal generation code")
Signed-off-by: Laurent Dufour <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: Dave Hansen <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions