powerpc/tm: Avoid possible userspace r1 corruption on reclaim

Current we store the userspace r1 to PACATMSCRATCH before finally
saving it to the thread struct.

In theory an exception could be taken here (like a machine check or
SLB miss) that could write PACATMSCRATCH and hence corrupt the
userspace r1. The SLB fault currently doesn't touch PACATMSCRATCH, but
others do.

We've never actually seen this happen but it's theoretically
possible. Either way, the code is fragile as it is.

This patch saves r1 to the kernel stack (which can't fault) before we
turn MSR[RI] back on. PACATMSCRATCH is still used but only with
MSR[RI] off. We then copy r1 from the kernel stack to the thread
struct once we have MSR[RI] back on.

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

diff --git a/arch/powerpc/kernel/tm.S b/arch/powerpc/kernel/tm.S
index 183e8d75936f15b194dbe74b1d44d89bf6377a19..7716374786bd97c7e56390ea587e967d75c68a2e 100644 (file)
--- a/arch/powerpc/kernel/tm.S
+++ b/arch/powerpc/kernel/tm.S
@@ -178,6 +178,13 @@ _GLOBAL(tm_reclaim)
 
        std     r11, GPR11(r1)                  /* Temporary stash */
 
+       /*
+        * Move the saved user r1 to the kernel stack in case PACATMSCRATCH is
+        * clobbered by an exception once we turn on MSR_RI below.
+        */
+       ld      r11, PACATMSCRATCH(r13)
+       std     r11, GPR1(r1)
+
        /*
         * Store r13 away so we can free up the scratch SPR for the SLB fault
         * handler (needed once we start accessing the thread_struct).
@@ -214,7 +221,7 @@ _GLOBAL(tm_reclaim)
        SAVE_GPR(8, r7)                         /* user r8 */
        SAVE_GPR(9, r7)                         /* user r9 */
        SAVE_GPR(10, r7)                        /* user r10 */
-       ld      r3, PACATMSCRATCH(r13)          /* user r1 */
+       ld      r3, GPR1(r1)                    /* user r1 */
        ld      r4, GPR7(r1)                    /* user r7 */
        ld      r5, GPR11(r1)                   /* user r11 */
        ld      r6, GPR12(r1)                   /* user r12 */