diff options
Diffstat (limited to 'arch/x86/entry/calling.h')
| -rw-r--r-- | arch/x86/entry/calling.h | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/arch/x86/entry/calling.h b/arch/x86/entry/calling.h index ea81770629ee..77e2d920a640 100644 --- a/arch/x86/entry/calling.h +++ b/arch/x86/entry/calling.h @@ -70,6 +70,8 @@ For 32-bit we have the following conventions - kernel is built with pushq %rsi /* pt_regs->si */ movq 8(%rsp), %rsi /* temporarily store the return address in %rsi */ movq %rdi, 8(%rsp) /* pt_regs->di (overwriting original return address) */ + /* We just clobbered the return address - use the IRET frame for unwinding: */ + UNWIND_HINT_IRET_REGS offset=3*8 .else pushq %rdi /* pt_regs->di */ pushq %rsi /* pt_regs->si */ @@ -97,7 +99,7 @@ For 32-bit we have the following conventions - kernel is built with .endif .endm -.macro CLEAR_REGS clear_bp=1 +.macro CLEAR_REGS clear_callee=1 /* * Sanitize registers of values that a speculation attack might * otherwise want to exploit. The lower registers are likely clobbered @@ -111,20 +113,19 @@ For 32-bit we have the following conventions - kernel is built with xorl %r9d, %r9d /* nospec r9 */ xorl %r10d, %r10d /* nospec r10 */ xorl %r11d, %r11d /* nospec r11 */ + .if \clear_callee xorl %ebx, %ebx /* nospec rbx */ - .if \clear_bp xorl %ebp, %ebp /* nospec rbp */ - .endif xorl %r12d, %r12d /* nospec r12 */ xorl %r13d, %r13d /* nospec r13 */ xorl %r14d, %r14d /* nospec r14 */ xorl %r15d, %r15d /* nospec r15 */ - + .endif .endm -.macro PUSH_AND_CLEAR_REGS rdx=%rdx rcx=%rcx rax=%rax save_ret=0 clear_bp=1 unwind_hint=1 +.macro PUSH_AND_CLEAR_REGS rdx=%rdx rcx=%rcx rax=%rax save_ret=0 clear_callee=1 unwind_hint=1 PUSH_REGS rdx=\rdx, rcx=\rcx, rax=\rax, save_ret=\save_ret unwind_hint=\unwind_hint - CLEAR_REGS clear_bp=\clear_bp + CLEAR_REGS clear_callee=\clear_callee .endm .macro POP_REGS pop_rdi=1 @@ -367,7 +368,7 @@ For 32-bit we have the following conventions - kernel is built with .endm .macro STACKLEAK_ERASE_NOCLOBBER -#ifdef CONFIG_GCC_PLUGIN_STACKLEAK +#ifdef CONFIG_KSTACK_ERASE PUSH_AND_CLEAR_REGS call stackleak_erase POP_REGS @@ -386,7 +387,7 @@ For 32-bit we have the following conventions - kernel is built with #endif /* !CONFIG_X86_64 */ .macro STACKLEAK_ERASE -#ifdef CONFIG_GCC_PLUGIN_STACKLEAK +#ifdef CONFIG_KSTACK_ERASE call stackleak_erase #endif .endm @@ -431,6 +432,7 @@ For 32-bit we have the following conventions - kernel is built with /* rdi: arg1 ... normal C conventions. rax is saved/restored. */ .macro THUNK name, func SYM_FUNC_START(\name) + ANNOTATE_NOENDBR pushq %rbp movq %rsp, %rbp |