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7241d26e81
linux/arch/powerpc
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Christophe Leroy 7241d26e81 powerpc/64: properly initialise the stackprotector canary on SMP. 
commit 06ec27aea9 ("powerpc/64: add stack protector support")
doesn't initialise the stack canary on SMP secondary CPU's paca,
leading to the following false positive report from the
stack protector.

smp: Bringing up secondary CPUs ...
Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: __schedule+0x978/0xa80
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.19.0-rc7-next-20181010-autotest-autotest #1
Call Trace:
[c000001fed5b3bf0] [c000000000a0ef3c] dump_stack+0xb0/0xf4 (unreliable)
[c000001fed5b3c30] [c0000000000f9d68] panic+0x140/0x308
[c000001fed5b3cc0] [c0000000000f9844] __stack_chk_fail+0x24/0x30
[c000001fed5b3d20] [c000000000a2c3a8] __schedule+0x978/0xa80
[c000001fed5b3e00] [c000000000a2c9b4] schedule_idle+0x34/0x60
[c000001fed5b3e30] [c00000000013d344] do_idle+0x224/0x3d0
[c000001fed5b3ec0] [c00000000013d6e0] cpu_startup_entry+0x30/0x50
[c000001fed5b3ef0] [c000000000047f34] start_secondary+0x4d4/0x520
[c000001fed5b3f90] [c00000000000b370] start_secondary_prolog+0x10/0x14

This patch properly initialises the stack_canary of the secondary
idle tasks.

Reported-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Fixes: 06ec27aea9 ("powerpc/64: add stack protector support")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-10-13 22:21:25 +11:00
..
boot powerpc/boot: Ensure _zimage_start is a weak symbol 2018-09-19 22:08:12 +10:00
configs powerpc/config: Enable CONFIG_PRINTK_TIME 2018-10-03 15:40:06 +10:00
crypto powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
include Merge branch 'fixes' into next 2018-10-09 16:51:05 +11:00
kernel powerpc/64: properly initialise the stackprotector canary on SMP. 2018-10-13 22:21:25 +11:00
kvm PPC KVM fixes for 4.19 2018-09-04 21:12:46 +02:00
lib Merge branch 'fixes' into next 2018-10-09 16:51:05 +11:00
math-emu
mm Merge branch 'fixes' into next 2018-10-09 16:51:05 +11:00
net powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
oprofile treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
perf powerpc/perf: Add missing break in power7_marked_instr_event() 2018-10-03 15:39:45 +10:00
platforms Merge branch 'fixes' into next 2018-10-09 16:51:05 +11:00
purgatory powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
sysdev powerpc/xive: Move a dereference below a NULL test 2018-10-03 15:40:02 +10:00
tools powerpc: Add a checkpatch wrapper with our preferred settings 2018-08-07 21:49:25 +10:00
xmon Revert "convert SLB miss handlers to C" and subsequent commits 2018-10-03 15:32:49 +10:00
Kconfig powerpc/64: add stack protector support 2018-10-03 15:40:03 +10:00
Kconfig.debug Kconfig: consolidate the "Kernel hacking" menu 2018-08-02 08:06:48 +09:00
Makefile powerpc: remove leftover code of old GCC version checks 2018-10-04 16:54:51 +10:00
Makefile.postlink