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authorChristophe Leroy <christophe.leroy@c-s.fr>2018-10-13 09:45:12 +0000
committerMichael Ellerman <mpe@ellerman.id.au>2018-10-13 22:21:25 +1100
commit7241d26e8175e95290a6549a470c330dbfc63442 (patch)
treeb1e0873d7940340c6054873611e08a91ab2db016 /ipc
parent9b7e4d601baac83a7104652042107ce94f245524 (diff)
downloadlinux-7241d26e8175e95290a6549a470c330dbfc63442.tar.bz2
powerpc/64: properly initialise the stackprotector canary on SMP.
commit 06ec27aea9fc ("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: 06ec27aea9fc ("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>
Diffstat (limited to 'ipc')
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