diff options
author | Song Liu <songliubraving@fb.com> | 2019-08-28 23:54:55 +0200 |
---|---|---|
committer | Thomas Gleixner <tglx@linutronix.de> | 2019-08-29 20:52:52 +0200 |
commit | 825d0b73cd7526b0bb186798583fae810091cbac (patch) | |
tree | 4bf50b03cc2e6598ba585f19bc8ce5cdd1d36945 /net | |
parent | a55aa89aab90fae7c815b0551b07be37db359d76 (diff) |
x86/mm/pti: Handle unaligned address gracefully in pti_clone_pagetable()
pti_clone_pmds() assumes that the supplied address is either:
- properly PUD/PMD aligned
or
- the address is actually mapped which means that independently
of the mapping level (PUD/PMD/PTE) the next higher mapping
exists.
If that's not the case the unaligned address can be incremented by PUD or
PMD size incorrectly. All callers supply mapped and/or aligned addresses,
but for the sake of robustness it's better to handle that case properly and
to emit a warning.
[ tglx: Rewrote changelog and added WARN_ON_ONCE() ]
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1908282352470.1938@nanos.tec.linutronix.de
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions