From: Andi Kleen <a...@linux.intel.com> Clear all registers for compat calls on 64bit kernels. All arguments are initially passed through the stack, so this is fairly simple without additional stubs.
Signed-off-by: Andi Kleen <a...@linux.intel.com> --- arch/x86/entry/entry_64_compat.S | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S index 98d5358e4041..16fd2643a77f 100644 --- a/arch/x86/entry/entry_64_compat.S +++ b/arch/x86/entry/entry_64_compat.S @@ -95,6 +95,8 @@ ENTRY(entry_SYSENTER_compat) pushq $0 /* pt_regs->r14 = 0 */ pushq $0 /* pt_regs->r15 = 0 */ cld + /* Can clear all because arguments are passed through the stack */ + CLEAR_ALL_REGS /* * SYSENTER doesn't filter flags, so we need to clear NT and AC @@ -223,6 +225,8 @@ GLOBAL(entry_SYSCALL_compat_after_hwframe) pushq $0 /* pt_regs->r13 = 0 */ pushq $0 /* pt_regs->r14 = 0 */ pushq $0 /* pt_regs->r15 = 0 */ + /* Can clear all because arguments are passed through the stack */ + CLEAR_ALL_REGS /* * User mode is traced as though IRQs are on, and SYSENTER @@ -348,6 +352,8 @@ ENTRY(entry_INT80_compat) pushq %r14 /* pt_regs->r14 */ pushq %r15 /* pt_regs->r15 */ cld + /* Can clear all because arguments are passed through the stack */ + CLEAR_ALL_REGS /* * User mode is traced as though IRQs are on, and the interrupt -- 2.14.3