powerpc/kexec: Fix memory corruption from unallocated slaves

BugLink: http://bugs.launchpad.net/bugs/793702

commit 3d2cea732d68aa270c360f55d8669820ebce188a upstream.

Commit 1fc711f7ffb01089efc58042cfdbac8573d1b59a (powerpc/kexec: Fix race
in kexec shutdown) moved the write to signal the cpu had exited the kernel
from before the transition to real mode in kexec_smp_wait to kexec_wait.

Unfornately it missed that kexec_wait is used both by cpus leaving the
kernel and by secondary slave cpus that were not allocated a paca for
what ever reason -- they could be beyond nr_cpus or not described in
the current device tree for whatever reason (for example, kexec-load
was not refreshed after a cpu hotplug operation).  Cpus coming through
that path they will write to paca[NR_CPUS] which is beyond the space
allocated for the paca data and overwrite memory not allocated to pacas
but very likely still real mode accessable).

Move the write back to kexec_smp_wait, which is used only by cpus that
found their paca, but after the transition to real mode.

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index 206a321..e89df59 100644 (file)
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -462,7 +462,8 @@ _GLOBAL(disable_kernel_fp)
  * wait for the flag to change, indicating this kernel is going away but
  * the slave code for the next one is at addresses 0 to 100.
  *
- * This is used by all slaves.
+ * This is used by all slaves, even those that did not find a matching
+ * paca in the secondary startup code.
  *
  * Physical (hardware) cpu id should be in r3.
  */
@@ -471,10 +472,6 @@ _GLOBAL(kexec_wait)
 1:     mflr    r5
        addi    r5,r5,kexec_flag-1b
 
-       li      r4,KEXEC_STATE_REAL_MODE
-       stb     r4,PACAKEXECSTATE(r13)
-       SYNC
-
 99:    HMT_LOW
 #ifdef CONFIG_KEXEC            /* use no memory without kexec */
        lwz     r4,0(r5)
@@ -499,11 +496,17 @@ kexec_flag:
  *
  * get phys id from paca
  * switch to real mode
+ * mark the paca as no longer used
  * join other cpus in kexec_wait(phys_id)
  */
 _GLOBAL(kexec_smp_wait)
        lhz     r3,PACAHWCPUID(r13)
        bl      real_mode
+
+       li      r4,KEXEC_STATE_REAL_MODE
+       stb     r4,PACAKEXECSTATE(r13)
+       SYNC
+
        b       .kexec_wait
 
 /*