Messages in this thread Patch in this message | | | From | David Woodhouse <> | Subject | [PATCH v6 08/10] x86/retpoline/irq32: Convert assembler indirect jumps | Date | Sun, 7 Jan 2018 22:11:23 +0000 |
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From: Andi Kleen <ak@linux.intel.com>
Convert all indirect jumps in 32bit irq inline asm code to use non speculative sequences.
Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Acked-By: Arjan van de Ven <arjan@linux.intel.com> --- arch/x86/kernel/irq_32.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c index a83b334..e1e58f7 100644 --- a/arch/x86/kernel/irq_32.c +++ b/arch/x86/kernel/irq_32.c @@ -20,6 +20,7 @@ #include <linux/mm.h> #include <asm/apic.h> +#include <asm/nospec-branch.h> #ifdef CONFIG_DEBUG_STACKOVERFLOW @@ -55,11 +56,11 @@ DEFINE_PER_CPU(struct irq_stack *, softirq_stack); static void call_on_stack(void *func, void *stack) { asm volatile("xchgl %%ebx,%%esp \n" - "call *%%edi \n" + NOSPEC_CALL "movl %%ebx,%%esp \n" : "=b" (stack) : "0" (stack), - "D"(func) + [thunk_target] "D"(func) : "memory", "cc", "edx", "ecx", "eax"); } @@ -95,11 +96,11 @@ static inline int execute_on_irq_stack(int overflow, struct irq_desc *desc) call_on_stack(print_stack_overflow, isp); asm volatile("xchgl %%ebx,%%esp \n" - "call *%%edi \n" + NOSPEC_CALL "movl %%ebx,%%esp \n" : "=a" (arg1), "=b" (isp) : "0" (desc), "1" (isp), - "D" (desc->handle_irq) + [thunk_target] "D" (desc->handle_irq) : "memory", "cc", "ecx"); return 1; } -- 2.7.4
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