powerpc/tm: Fix userspace r13 corruption

When we treclaim we store the userspace checkpointed r13 to a scratch
SPR and then later save the scratch SPR to the user thread struct.

Unfortunately, this doesn't work as accessing the user thread struct
can take an SLB fault and the SLB fault handler will write the same
scratch SPRG that now contains the userspace r13.

To fix this, we store r13 to the kernel stack (which can't fault)
before we access the user thread struct.

Found by running P8 guest + powervm + disable_1tb_segments + TM. Seen
as a random userspace segfault with r13 looking like a kernel address.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Reviewed-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 9 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/tm.S b/arch/powerpc/kernel/tm.S
index 6bffbc5affe7..183e8d75936f 100644
--- a/arch/powerpc/kernel/tm.S
+++ b/arch/powerpc/kernel/tm.S
@@ -176,13 +176,20 @@ _GLOBAL(tm_reclaim)
         std     r1, PACATMSCRATCH(r13)
         ld      r1, PACAR1(r13)
 
-        /* Store the PPR in r11 and reset to decent value */
         std     r11, GPR11(r1)                  /* Temporary stash */
 
+        /*
+         * Store r13 away so we can free up the scratch SPR for the SLB fault
+         * handler (needed once we start accessing the thread_struct).
+         */
+        GET_SCRATCH0(r11)
+        std     r11, GPR13(r1)
+
         /* Reset MSR RI so we can take SLB faults again */
         li      r11, MSR_RI
         mtmsrd  r11, 1
 
+        /* Store the PPR in r11 and reset to decent value */
         mfspr   r11, SPRN_PPR
         HMT_MEDIUM
 
@@ -211,7 +218,7 @@ _GLOBAL(tm_reclaim)
         ld      r4, GPR7(r1)                    /* user r7 */
         ld      r5, GPR11(r1)                   /* user r11 */
         ld      r6, GPR12(r1)                   /* user r12 */
-        GET_SCRATCH0(8)                         /* user r13 */
+        ld      r8, GPR13(r1)                   /* user r13 */
         std     r3, GPR1(r7)
         std     r4, GPR7(r7)
         std     r5, GPR11(r7)