diff options
| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-10-14 16:51:28 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-10-17 08:57:43 +1100 |
| commit | d10f60ae27d26d811e2a1bb39ded47df96d7499f (patch) | |
| tree | 04055f423810aea371f77a733419234e78f070f5 | |
| parent | 2272905a4580f26630f7d652cc33935b59f96d4c (diff) | |
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: a68c31fc01ef ("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
| -rw-r--r-- | arch/powerpc/include/asm/book3s/32/kup.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/book3s/32/kup.h b/arch/powerpc/include/asm/book3s/32/kup.h index 677e9babef80..f9dc597b0b86 100644 --- a/arch/powerpc/include/asm/book3s/32/kup.h +++ b/arch/powerpc/include/asm/book3s/32/kup.h @@ -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); |