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powerpc/powernv/idle: Restore IAMR after idle

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commit a3f3072db6cad40895c585dce65e36aab997f042 upstream.

Without restoring the IAMR after idle, execution prevention on POWER9
with Radix MMU is overwritten and the kernel can freely execute
userspace without faulting.

This is necessary when returning from any stop state that modifies
user state, as well as hypervisor state.

To test how this fails without this patch, load the lkdtm driver and
do the following:

  $ echo EXEC_USERSPACE > /sys/kernel/debug/provoke-crash/DIRECT

which won't fault, then boot the kernel with powersave=off, where it
will fault. Applying this patch will fix this.

Fixes: 3b10d0095a1e ("powerpc/mm/radix: Prevent kernel execution of user space")
Cc: stable@vger.kernel.org # v4.10+
Signed-off-by: Russell Currey <ruscur@russell.cc>
Reviewed-by: Akshay Adiga <akshay.adiga@linux.vnet.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Russell Currey 2019-04-18 16:51:16 +10:00 committed by Greg Kroah-Hartman
parent 1a3a561df5
commit af2db2a1e7
1 changed files with 20 additions and 0 deletions
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20
arch/powerpc/kernel/idle_book3s.S
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@ -163,6 +163,9 @@ core_idle_lock_held:
bne- core_idle_lock_held
blr
/* Reuse an unused pt_regs slot for IAMR */
#define PNV_POWERSAVE_IAMR _DAR
/*
* Pass requested state in r3:
* r3 - PNV_THREAD_NAP/SLEEP/WINKLE in POWER8
@ -193,6 +196,12 @@ pnv_powersave_common:
/* Continue saving state */
SAVE_GPR(2, r1)
SAVE_NVGPRS(r1)
BEGIN_FTR_SECTION
mfspr r5, SPRN_IAMR
std r5, PNV_POWERSAVE_IAMR(r1)
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
mfcr r5
std r5,_CCR(r1)
std r1,PACAR1(r13)
@ -940,6 +949,17 @@ BEGIN_FTR_SECTION
END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
REST_NVGPRS(r1)
REST_GPR(2, r1)
BEGIN_FTR_SECTION
/* IAMR was saved in pnv_powersave_common() */
ld r5, PNV_POWERSAVE_IAMR(r1)
mtspr SPRN_IAMR, r5
/*
* We don't need an isync here because the upcoming mtmsrd is
* execution synchronizing.
*/
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
ld r4,PACAKMSR(r13)
ld r5,_LINK(r1)
ld r6,_CCR(r1)