| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 271/306] x86/doublefault/32: Fix stack canaries in the double fault handler | Date | Wed, 27 Nov 2019 21:32:01 +0100 |
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From: Andy Lutomirski <luto@kernel.org>
commit 3580d0b29cab08483f84a16ce6a1151a1013695f upstream.
The double fault TSS was missing GS setup, which is needed for stack canaries to work.
Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/x86/kernel/doublefault.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/arch/x86/kernel/doublefault.c +++ b/arch/x86/kernel/doublefault.c @@ -65,6 +65,9 @@ struct x86_hw_tss doublefault_tss __cach .ss = __KERNEL_DS, .ds = __USER_DS, .fs = __KERNEL_PERCPU, +#ifndef CONFIG_X86_32_LAZY_GS + .gs = __KERNEL_STACK_CANARY, +#endif .__cr3 = __pa_nodebug(swapper_pg_dir), };
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