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powerpc/32s: fix allow/prevent_user_access() when crossing segment boundaries. 

Make sure starting addr is aligned to segment boundary so that when
incrementing the segment, the starting address of the new segment is
below the end address. Otherwise the last segment might get  missed.

Fixes: a68c31fc01 ("powerpc/32s: Implement Kernel Userspace Access Protection")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/067a1b09f15f421d40797c2d04c22d4049a1cee8.1571071875.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2019-10-14 16:51:28 +00:00 committed by Michael Ellerman
parent 2272905a45
commit d10f60ae27
1 changed files with 1 additions and 0 deletions
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1
arch/powerpc/include/asm/book3s/32/kup.h
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@ -91,6 +91,7 @@
static inline void kuap_update_sr(u32 sr, u32 addr, u32 end)
{
addr &= 0xf0000000; /* align addr to start of segment */
barrier(); /* make sure thread.kuap is updated before playing with SRs */
while (addr < end) {
mtsrin(sr, addr);