diff options
| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-10-19 09:29:13 +0200 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-12-09 22:41:17 +1100 |
| commit | 13dac4e31e75ce10b2fcaad4432a24dae6c955f6 (patch) | |
| tree | 9fa4157708c5765962619f71fce6f866dfd68abd /arch/powerpc/include/asm/nohash/32/mmu-8xx.h | |
| parent | Revert "powerpc: Inline setup_kup()" (diff) | |
| download | linux-dev-13dac4e31e75ce10b2fcaad4432a24dae6c955f6.tar.xz linux-dev-13dac4e31e75ce10b2fcaad4432a24dae6c955f6.zip | |
powerpc/8xx: Activate KUEP at all time
On the 8xx, there is absolutely no runtime impact with KUEP. Protection
against execution of user code in kernel mode is set up at boot time
by configuring the groups with contain all user pages as having swapped
protection rights, in extenso EX for user and NA for supervisor.
Configure KUEP at startup and force selection of CONFIG_PPC_KUEP.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/2129e86944323ffe9ed07fffbeafdfd2e363690a.1634627931.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/include/asm/nohash/32/mmu-8xx.h')
| -rw-r--r-- | arch/powerpc/include/asm/nohash/32/mmu-8xx.h | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/arch/powerpc/include/asm/nohash/32/mmu-8xx.h b/arch/powerpc/include/asm/nohash/32/mmu-8xx.h index 997cec973406..0e93a4728c9e 100644 --- a/arch/powerpc/include/asm/nohash/32/mmu-8xx.h +++ b/arch/powerpc/include/asm/nohash/32/mmu-8xx.h @@ -39,12 +39,10 @@ * 0 => Kernel => 11 (all accesses performed according as user iaw page definition) * 1 => Kernel+Accessed => 01 (all accesses performed according to page definition) * 2 => User => 11 (all accesses performed according as user iaw page definition) - * 3 => User+Accessed => 00 (all accesses performed as supervisor iaw page definition) for INIT - * => 10 (all accesses performed according to swaped page definition) for KUEP + * 3 => User+Accessed => 10 (all accesses performed according to swaped page definition) for KUEP * 4-15 => Not Used */ -#define MI_APG_INIT 0xdc000000 -#define MI_APG_KUEP 0xde000000 +#define MI_APG_INIT 0xde000000 /* The effective page number register. When read, contains the information * about the last instruction TLB miss. When MI_RPN is written, bits in |