+2018-07-14 Igor Tsimbalist <igor.v.tsimbalist@intel.com>
+ H.J. Lu <hongjiu.lu@intel.com>
+
+ * sysdeps/i386/__longjmp.S: Include <jmp_buf-ssp.h>.
+ (__longjmp): Restore shadow stack pointer if shadow stack is
+ enabled, SHADOW_STACK_POINTER_OFFSET is defined and __longjmp
+ isn't defined for __longjmp_cancel.
+ * sysdeps/i386/bsd-_setjmp.S: Include <jmp_buf-ssp.h>.
+ (_setjmp): Save shadow stack pointer if shadow stack is enabled
+ and SHADOW_STACK_POINTER_OFFSET is defined.
+ * sysdeps/i386/bsd-setjmp.S: Include <jmp_buf-ssp.h>.
+ (setjmp): Save shadow stack pointer if shadow stack is enabled
+ and SHADOW_STACK_POINTER_OFFSET is defined.
+ * sysdeps/i386/setjmp.S: Include <jmp_buf-ssp.h>.
+ (__sigsetjmp): Save shadow stack pointer if shadow stack is
+ enabled and SHADOW_STACK_POINTER_OFFSET is defined.
+ * sysdeps/unix/sysv/linux/i386/____longjmp_chk.S: Include
+ <jmp_buf-ssp.h>.
+ (____longjmp_chk): Restore shadow stack pointer if shadow stack
+ is enabled and SHADOW_STACK_POINTER_OFFSET is defined.
+ * sysdeps/unix/sysv/linux/x86/Makefile (gen-as-const-headers):
+ Remove jmp_buf-ssp.sym.
+ * sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S: Include
+ <jmp_buf-ssp.h>.
+ (____longjmp_chk): Restore shadow stack pointer if shadow stack
+ is enabled and SHADOW_STACK_POINTER_OFFSET is defined.
+ * sysdeps/x86/Makefile (gen-as-const-headers): Add
+ jmp_buf-ssp.sym.
+ * sysdeps/x86/jmp_buf-ssp.sym: New dummy file.
+ * sysdeps/x86_64/__longjmp.S: Include <jmp_buf-ssp.h>.
+ (__longjmp): Restore shadow stack pointer if shadow stack is
+ enabled, SHADOW_STACK_POINTER_OFFSET is defined and __longjmp
+ isn't defined for __longjmp_cancel.
+ * sysdeps/x86_64/setjmp.S: Include <jmp_buf-ssp.h>.
+ (__sigsetjmp): Save shadow stack pointer if shadow stack is
+ enabled and SHADOW_STACK_POINTER_OFFSET is defined.
+
2018-07-14 H.J. Lu <hongjiu.lu@intel.com>
[BZ #22563]
#include <sysdep.h>
#include <jmpbuf-offsets.h>
+#include <jmp_buf-ssp.h>
#include <asm-syntax.h>
#include <stap-probe.h>
+/* Don't restore shadow stack register if
+ 1. Shadow stack isn't enabled. Or
+ 2. __longjmp is defined for __longjmp_cancel.
+ */
+#if !SHSTK_ENABLED || defined __longjmp
+# undef SHADOW_STACK_POINTER_OFFSET
+#endif
+
.text
ENTRY (__longjmp)
#ifdef PTR_DEMANGLE
movl 4(%esp), %eax /* User's jmp_buf in %eax. */
+# ifdef SHADOW_STACK_POINTER_OFFSET
+# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
+ /* Check if Shadow Stack is enabled. */
+ testl $X86_FEATURE_1_SHSTK, %gs:FEATURE_1_OFFSET
+ jz L(skip_ssp)
+# else
+ xorl %edx, %edx
+# endif
+ /* Check and adjust the Shadow-Stack-Pointer. */
+ rdsspd %edx
+ /* And compare it with the saved ssp value. */
+ subl SHADOW_STACK_POINTER_OFFSET(%eax), %edx
+ je L(skip_ssp)
+ /* Count the number of frames to adjust and adjust it
+ with incssp instruction. The instruction can adjust
+ the ssp by [0..255] value only thus use a loop if
+ the number of frames is bigger than 255. */
+ negl %edx
+ shrl $2, %edx
+ /* NB: We saved Shadow-Stack-Pointer of setjmp. Since we are
+ restoring Shadow-Stack-Pointer of setjmp's caller, we
+ need to unwind shadow stack by one more frame. */
+ addl $1, %edx
+ movl $255, %ebx
+L(loop):
+ cmpl %ebx, %edx
+ cmovb %edx, %ebx
+ incsspd %ebx
+ subl %ebx, %edx
+ ja L(loop)
+L(skip_ssp):
+# endif
/* Save the return address now. */
movl (JB_PC*4)(%eax), %edx
/* Get the stack pointer. */
#else
movl 4(%esp), %ecx /* User's jmp_buf in %ecx. */
movl 8(%esp), %eax /* Second argument is return value. */
+# ifdef SHADOW_STACK_POINTER_OFFSET
+# if IS_IN (libc) && defined SHARED
+ /* Check if Shadow Stack is enabled. */
+ testl $X86_FEATURE_1_SHSTK, %gs:FEATURE_1_OFFSET
+ jz L(skip_ssp)
+# endif
+ /* Check and adjust the Shadow-Stack-Pointer. */
+ xorl %edx, %edx
+ /* Get the current ssp. */
+ rdsspd %edx
+ /* And compare it with the saved ssp value. */
+ subl SHADOW_STACK_POINTER_OFFSET(%ecx), %edx
+ je L(skip_ssp)
+ /* Count the number of frames to adjust and adjust it
+ with incssp instruction. The instruction can adjust
+ the ssp by [0..255] value only thus use a loop if
+ the number of frames is bigger than 255. */
+ negl %edx
+ shrl $2, %edx
+ /* NB: We saved Shadow-Stack-Pointer of setjmp. Since we are
+ restoring Shadow-Stack-Pointer of setjmp's caller, we
+ need to unwind shadow stack by one more frame. */
+ addl $1, %edx
+ movl $255, %ebx
+L(loop):
+ cmpl %ebx, %edx
+ cmovb %edx, %ebx
+ incsspd %ebx
+ subl %ebx, %edx
+ ja L(loop)
+L(skip_ssp):
+# endif
/* Save the return address now. */
movl (JB_PC*4)(%ecx), %edx
LIBC_PROBE (longjmp, 3, 4@%ecx, -4@%eax, 4@%edx)
#include <sysdep.h>
#include <jmpbuf-offsets.h>
+#include <jmp_buf-ssp.h>
#include <stap-probe.h>
#define PARMS 4 /* no space for saved regs */
#define JMPBUF PARMS
#define SIGMSK JMPBUF+4
+/* Don't save shadow stack register if shadow stack isn't enabled. */
+#if !SHSTK_ENABLED
+# undef SHADOW_STACK_POINTER_OFFSET
+#endif
+
ENTRY (_setjmp)
xorl %eax, %eax
movl %ebp, (JB_BP*4)(%edx) /* Save caller's frame pointer. */
movl %eax, JB_SIZE(%edx) /* No signal mask set. */
+#ifdef SHADOW_STACK_POINTER_OFFSET
+# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
+ /* Check if Shadow Stack is enabled. */
+ testl $X86_FEATURE_1_SHSTK, %gs:FEATURE_1_OFFSET
+ jz L(skip_ssp)
+# else
+ xorl %ecx, %ecx
+# endif
+ /* Get the current Shadow-Stack-Pointer and save it. */
+ rdsspd %ecx
+ movl %ecx, SHADOW_STACK_POINTER_OFFSET(%edx)
+# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
+L(skip_ssp):
+# endif
+#endif
ret
END (_setjmp)
libc_hidden_def (_setjmp)
#include <sysdep.h>
#include <jmpbuf-offsets.h>
+#include <jmp_buf-ssp.h>
#include <stap-probe.h>
#define PARMS 4 /* no space for saved regs */
#define JMPBUF PARMS
#define SIGMSK JMPBUF+4
+/* Don't save shadow stack register if shadow stack isn't enabled. */
+#if !SHSTK_ENABLED
+# undef SHADOW_STACK_POINTER_OFFSET
+#endif
+
ENTRY (setjmp)
/* Note that we have to use a non-exported symbol in the next
jump since otherwise gas will emit it as a jump through the
#endif
movl %ecx, (JB_PC*4)(%eax)
movl %ebp, (JB_BP*4)(%eax) /* Save caller's frame pointer. */
+#ifdef SHADOW_STACK_POINTER_OFFSET
+# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
+ /* Check if Shadow Stack is enabled. */
+ testl $X86_FEATURE_1_SHSTK, %gs:FEATURE_1_OFFSET
+ jz L(skip_ssp)
+# else
+ xorl %ecx, %ecx
+# endif
+ /* Get the current Shadow-Stack-Pointer and save it. */
+ rdsspd %ecx
+ movl %ecx, SHADOW_STACK_POINTER_OFFSET(%eax)
+# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
+L(skip_ssp):
+# endif
+#endif
/* Call __sigjmp_save. */
pushl $1
#include <sysdep.h>
#include <jmpbuf-offsets.h>
+#include <jmp_buf-ssp.h>
#include <asm-syntax.h>
#include <stap-probe.h>
#define JMPBUF PARMS
#define SIGMSK JMPBUF+4
+/* Don't save shadow stack register if shadow stack isn't enabled. */
+#if !SHSTK_ENABLED
+# undef SHADOW_STACK_POINTER_OFFSET
+#endif
+
ENTRY (__sigsetjmp)
movl JMPBUF(%esp), %eax
movl %ecx, (JB_PC*4)(%eax)
movl %ebp, (JB_BP*4)(%eax) /* Save caller's frame pointer. */
+#ifdef SHADOW_STACK_POINTER_OFFSET
+# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
+ /* Check if Shadow Stack is enabled. */
+ testl $X86_FEATURE_1_SHSTK, %gs:FEATURE_1_OFFSET
+ jz L(skip_ssp)
+# else
+ xorl %ecx, %ecx
+# endif
+ /* Get the current Shadow-Stack-Pointer and save it. */
+ rdsspd %ecx
+ movl %ecx, SHADOW_STACK_POINTER_OFFSET(%eax)
+# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
+L(skip_ssp):
+# endif
+#endif
#if IS_IN (rtld)
/* In ld.so we never save the signal mask. */
xorl %eax, %eax
#include <sysdep.h>
#include <jmpbuf-offsets.h>
+#include <jmp_buf-ssp.h>
#include <asm-syntax.h>
#include <stap-probe.h>
+/* Don't restore shadow stack register if shadow stack isn't enabled. */
+#if !SHSTK_ENABLED
+# undef SHADOW_STACK_POINTER_OFFSET
+#endif
.section .rodata.str1.1,"aMS",@progbits,1
.type longjmp_msg,@object
ENTRY (____longjmp_chk)
movl 4(%esp), %ecx /* User's jmp_buf in %ecx. */
+#ifdef SHADOW_STACK_POINTER_OFFSET
+# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
+ /* Check if Shadow Stack is enabled. */
+ testl $X86_FEATURE_1_SHSTK, %gs:FEATURE_1_OFFSET
+ jz L(skip_ssp)
+# else
+ xorl %edx, %edx
+# endif
+ /* Check and adjust the Shadow-Stack-Pointer. */
+ rdsspd %edx
+ /* And compare it with the saved ssp value. */
+ subl SHADOW_STACK_POINTER_OFFSET(%ecx), %edx
+ je L(skip_ssp)
+ /* Count the number of frames to adjust and adjust it
+ with incssp instruction. The instruction can adjust
+ the ssp by [0..255] value only thus use a loop if
+ the number of frames is bigger than 255. */
+ negl %edx
+ shrl $2, %edx
+ /* NB: We saved Shadow-Stack-Pointer of setjmp. Since we are
+ restoring Shadow-Stack-Pointer of setjmp's caller, we
+ need to unwind shadow stack by one more frame. */
+ addl $1, %edx
+ movl $255, %ebx
+L(loop):
+ cmpl %ebx, %edx
+ cmovb %edx, %ebx
+ incsspd %ebx
+ subl %ebx, %edx
+ ja L(loop)
+L(skip_ssp):
+#endif
/* Save the return address now. */
movl (JB_PC*4)(%ecx), %edx
/* Get the stack pointer. */
endif
ifeq ($(subdir),setjmp)
-gen-as-const-headers += jmp_buf-ssp.sym
tests += tst-saved_mask-1
endif
#include <asm-syntax.h>
#include <stap-probe.h>
+/* Don't restore shadow stack register if shadow stack isn't enabled. */
+#if !SHSTK_ENABLED
+# undef SHADOW_STACK_POINTER_OFFSET
+#endif
+
#include <sigaltstack-offsets.h>
+#include <jmp_buf-ssp.h>
.section .rodata.str1.1,"aMS",@progbits,1
.type longjmp_msg,@object
cfi_restore (%rsi)
.Lok:
+#ifdef SHADOW_STACK_POINTER_OFFSET
+# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
+ /* Check if Shadow Stack is enabled. */
+ testl $X86_FEATURE_1_SHSTK, %fs:FEATURE_1_OFFSET
+ jz L(skip_ssp)
+# else
+ xorl %eax, %eax
+# endif
+ /* Check and adjust the Shadow-Stack-Pointer. */
+ rdsspq %rax
+ /* And compare it with the saved ssp value. */
+ subq SHADOW_STACK_POINTER_OFFSET(%rdi), %rax
+ je L(skip_ssp)
+ /* Count the number of frames to adjust and adjust it
+ with incssp instruction. The instruction can adjust
+ the ssp by [0..255] value only thus use a loop if
+ the number of frames is bigger than 255. */
+ negq %rax
+ shrq $3, %rax
+ /* NB: We saved Shadow-Stack-Pointer of setjmp. Since we are
+ restoring Shadow-Stack-Pointer of setjmp's caller, we
+ need to unwind shadow stack by one more frame. */
+ addq $1, %rax
+ movl $255, %ebx
+L(loop):
+ cmpq %rbx, %rax
+ cmovb %rax, %rbx
+ incsspq %rbx
+ subq %rbx, %rax
+ ja L(loop)
+L(skip_ssp):
+#endif
LIBC_PROBE (longjmp, 3, LP_SIZE@%RDI_LP, -4@%esi, LP_SIZE@%RDX_LP)
/* We add unwind information for the target here. */
cfi_def_cfa(%rdi, 0)
endif
ifeq ($(subdir),setjmp)
+gen-as-const-headers += jmp_buf-ssp.sym
sysdep_routines += __longjmp_cancel
endif
--- /dev/null
+-- FIXME: Define SHADOW_STACK_POINTER_OFFSET to support shadow stack.
#include <sysdep.h>
#include <jmpbuf-offsets.h>
+#include <jmp_buf-ssp.h>
#include <asm-syntax.h>
#include <stap-probe.h>
+/* Don't restore shadow stack register if
+ 1. Shadow stack isn't enabled. Or
+ 2. __longjmp is defined for __longjmp_cancel.
+ */
+#if !SHSTK_ENABLED || defined __longjmp
+# undef SHADOW_STACK_POINTER_OFFSET
+#endif
+
/* Jump to the position specified by ENV, causing the
setjmp call there to return VAL, or 1 if VAL is 0.
void __longjmp (__jmp_buf env, int val). */
shlq $32, %rax
orq %rax, %r9
# endif
+#endif
+#ifdef SHADOW_STACK_POINTER_OFFSET
+# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
+ /* Check if Shadow Stack is enabled. */
+ testl $X86_FEATURE_1_SHSTK, %fs:FEATURE_1_OFFSET
+ jz L(skip_ssp)
+# else
+ xorl %eax, %eax
+# endif
+ /* Check and adjust the Shadow-Stack-Pointer. */
+ /* Get the current ssp. */
+ rdsspq %rax
+ /* And compare it with the saved ssp value. */
+ subq SHADOW_STACK_POINTER_OFFSET(%rdi), %rax
+ je L(skip_ssp)
+ /* Count the number of frames to adjust and adjust it
+ with incssp instruction. The instruction can adjust
+ the ssp by [0..255] value only thus use a loop if
+ the number of frames is bigger than 255. */
+ negq %rax
+ shrq $3, %rax
+ /* NB: We saved Shadow-Stack-Pointer of setjmp. Since we are
+ restoring Shadow-Stack-Pointer of setjmp's caller, we
+ need to unwind shadow stack by one more frame. */
+ addq $1, %rax
+
+ movl $255, %ebx
+L(loop):
+ cmpq %rbx, %rax
+ cmovb %rax, %rbx
+ incsspq %rbx
+ subq %rbx, %rax
+ ja L(loop)
+
+L(skip_ssp):
#endif
LIBC_PROBE (longjmp, 3, LP_SIZE@%RDI_LP, -4@%esi, LP_SIZE@%RDX_LP)
/* We add unwind information for the target here. */
#include <sysdep.h>
#include <jmpbuf-offsets.h>
+#include <jmp_buf-ssp.h>
#include <asm-syntax.h>
#include <stap-probe.h>
+/* Don't save shadow stack register if shadow stack isn't enabled. */
+#if !SHSTK_ENABLED
+# undef SHADOW_STACK_POINTER_OFFSET
+#endif
+
ENTRY (__sigsetjmp)
/* Save registers. */
movq %rbx, (JB_RBX*8)(%rdi)
#endif
movq %rax, (JB_PC*8)(%rdi)
+#ifdef SHADOW_STACK_POINTER_OFFSET
+# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
+ /* Check if Shadow Stack is enabled. */
+ testl $X86_FEATURE_1_SHSTK, %fs:FEATURE_1_OFFSET
+ jz L(skip_ssp)
+# else
+ xorl %eax, %eax
+# endif
+ /* Get the current Shadow-Stack-Pointer and save it. */
+ rdsspq %rax
+ movq %rax, SHADOW_STACK_POINTER_OFFSET(%rdi)
+# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
+L(skip_ssp):
+# endif
+#endif
#if IS_IN (rtld)
/* In ld.so we never save the signal mask. */
xorl %eax, %eax
projects / thirdparty / glibc.git / commitdiff
