573 lines
16 KiB
Diff
573 lines
16 KiB
Diff
commit 5d844e1b72513cf59b5e7c14295644efdcc66e44
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Fri Feb 14 14:45:34 2020 -0800
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i386: Enable CET support in ucontext functions
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1. getcontext and swapcontext are updated to save the caller's shadow
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stack pointer and return address.
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2. setcontext and swapcontext are updated to restore shadow stack and
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jump to new context directly.
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3. makecontext is updated to allocate a new shadow stack and set the
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caller's return address to the helper code, L(exitcode).
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4. Since we no longer save and restore EAX, ECX and EDX in getcontext,
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setcontext and swapcontext, we can use them as scratch register slots
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to enable CET in ucontext functions.
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Since makecontext allocates a new shadow stack when making a new
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context and kernel allocates a new shadow stack for clone/fork/vfork
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syscalls, we track the current shadow stack base. In setcontext and
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swapcontext, if the target shadow stack base is the same as the current
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shadow stack base, we unwind the shadow stack. Otherwise it is a stack
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switch and we look for a restore token.
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We enable shadow stack at run-time only if program and all used shared
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objects, including dlopened ones, are shadow stack enabled, which means
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that they must be compiled with GCC 8 or above and glibc 2.28 or above.
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We need to save and restore shadow stack only if shadow stack is enabled.
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When caller of getcontext, setcontext, swapcontext and makecontext is
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compiled with smaller ucontext_t, shadow stack won't be enabled at
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run-time. We check if shadow stack is enabled before accessing the
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extended field in ucontext_t.
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Tested on i386 CET/non-CET machines.
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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---
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diff --git a/sysdeps/unix/sysv/linux/i386/getcontext.S b/sysdeps/unix/sysv/linux/i386/getcontext.S
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index 6637596..4ed9d03 100644
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--- a/sysdeps/unix/sysv/linux/i386/getcontext.S
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+++ b/sysdeps/unix/sysv/linux/i386/getcontext.S
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@@ -18,6 +18,7 @@
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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+#include <asm/prctl.h>
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#include "ucontext_i.h"
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@@ -42,6 +43,61 @@ ENTRY(__getcontext)
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movw %fs, %dx
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movl %edx, oFS(%eax)
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+#if SHSTK_ENABLED
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+ /* Check if shadow stack is enabled. */
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+ testl $X86_FEATURE_1_SHSTK, %gs:FEATURE_1_OFFSET
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+ jz L(no_shstk)
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+
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+ /* Save EAX in EDX. */
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+ movl %eax, %edx
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+
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+ xorl %eax, %eax
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+ cmpl %gs:SSP_BASE_OFFSET, %eax
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+ jnz L(shadow_stack_bound_recorded)
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+
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+ /* Save EBX in the first scratch register slot. */
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+ movl %ebx, oSCRATCH1(%edx)
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+
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+ /* Get the base address and size of the default shadow stack
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+ which must be the current shadow stack since nothing has
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+ been recorded yet. */
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+ sub $24, %esp
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+ mov %esp, %ecx
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+ movl $ARCH_CET_STATUS, %ebx
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+ movl $__NR_arch_prctl, %eax
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+ ENTER_KERNEL
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+ testl %eax, %eax
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+ jz L(continue_no_err)
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+
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+ /* This should never happen. */
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+ hlt
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+
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+L(continue_no_err):
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+ /* Restore EBX from the first scratch register slot. */
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+ movl oSCRATCH1(%edx), %ebx
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+
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+ /* Record the base of the current shadow stack. */
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+ movl 8(%esp), %eax
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+ movl %eax, %gs:SSP_BASE_OFFSET
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+ add $24, %esp
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+
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+L(shadow_stack_bound_recorded):
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+ /* Load address of the context data structure. */
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+ movl 4(%esp), %eax
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+
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+ /* Get the current shadow stack pointer. */
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+ rdsspd %edx
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+ /* NB: Save the caller's shadow stack so that we can jump back
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+ to the caller directly. */
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+ addl $4, %edx
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+ movl %edx, oSSP(%eax)
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+
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+ /* Save the current shadow stack base in ucontext. */
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+ movl %gs:SSP_BASE_OFFSET, %edx
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+ movl %edx, (oSSP + 4)(%eax)
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+
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+L(no_shstk):
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+#endif
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/* We have separate floating-point register content memory on the
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stack. We use the __fpregs_mem block in the context. Set the
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links up correctly. */
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diff --git a/sysdeps/unix/sysv/linux/i386/makecontext.S b/sysdeps/unix/sysv/linux/i386/makecontext.S
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index e3ca3dc..2d82ddc 100644
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--- a/sysdeps/unix/sysv/linux/i386/makecontext.S
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+++ b/sysdeps/unix/sysv/linux/i386/makecontext.S
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@@ -18,6 +18,7 @@
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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+#include <asm/prctl.h>
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#include "ucontext_i.h"
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@@ -68,6 +69,127 @@ ENTRY(__makecontext)
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jnz 1b
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2:
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+#if SHSTK_ENABLED
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+ /* Check if Shadow Stack is enabled. */
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+ testl $X86_FEATURE_1_SHSTK, %gs:FEATURE_1_OFFSET
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+ jz L(skip_ssp)
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+
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+ /* Reload the pointer to ucontext. */
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+ movl 4(%esp), %eax
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+
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+ /* Shadow stack is enabled. We need to allocate a new shadow
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+ stack. */
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+ subl oSS_SP(%eax), %edx
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+ shrl $STACK_SIZE_TO_SHADOW_STACK_SIZE_SHIFT, %edx
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+
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+ /* Align shadow stack size to 8 bytes. */
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+ addl $7, %edx
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+ andl $-8, %edx
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+
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+ /* Store shadow stack size in __ssp[2]. */
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+ movl %edx, (oSSP + 8)(%eax)
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+
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+ /* Save ESI in the second scratch register slot. */
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+ movl %esi, oSCRATCH2(%eax)
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+ /* Save EDI in the third scratch register slot. */
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+ movl %edi, oSCRATCH3(%eax)
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+
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+ /* Save the pointer to ucontext. */
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+ movl %eax, %edi
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+
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+ /* Get the original shadow stack pointer. */
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+ rdsspd %esi
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+
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+ /* Align the saved original shadow stack pointer to the next
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+ 8 byte aligned boundary. */
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+ andl $-8, %esi
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+
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+ /* Load the top of the new stack into EDX. */
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+ movl oESP(%eax), %edx
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+
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+ /* We need to terminate the FDE here because the unwinder looks
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+ at ra-1 for unwind information. */
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+ cfi_endproc
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+
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+ /* Swap the original stack pointer with the top of the new
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+ stack. */
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+ xchgl %esp, %edx
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+
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+ /* Add 4 bytes since CALL will push the 4-byte return address
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+ onto stack. */
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+ addl $4, %esp
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+
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+ /* Allocate the new shadow stack. Save EBX in the first scratch
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+ register slot. */
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+ movl %ebx, oSCRATCH1(%eax)
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+
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+ /* CET syscall takes 64-bit sizes. */
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+ subl $16, %esp
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+ movl (oSSP + 8)(%eax), %ecx
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+ movl %ecx, (%esp)
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+ movl $0, 4(%esp)
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+ movl %ecx, 8(%esp)
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+ movl $0, 12(%esp)
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+ movl %esp, %ecx
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+
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+ movl $ARCH_CET_ALLOC_SHSTK, %ebx
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+ movl $__NR_arch_prctl, %eax
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+ ENTER_KERNEL
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+ testl %eax, %eax
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+ jne L(hlt) /* This should never happen. */
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+
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+ /* Copy the base address of the new shadow stack to __ssp[1]. */
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+ movl (%esp), %eax
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+ movl %eax, (oSSP + 4)(%edi)
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+
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+ addl $16, %esp
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+
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+ /* Restore EBX from the first scratch register slot. */
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+ movl oSCRATCH1(%edi), %ebx
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+
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+ /* Get the size of the new shadow stack. */
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+ movl (oSSP + 8)(%edi), %ecx
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+
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+ /* Use the restore stoken to restore the new shadow stack. */
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+ rstorssp -8(%eax, %ecx)
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+
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+ /* Save the restore token at the next 8 byte aligned boundary
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+ on the original shadow stack. */
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+ saveprevssp
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+
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+ /* Push the address of "jmp exitcode" onto the new stack as
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+ well as the new shadow stack. */
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+ call 1f
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+ jmp L(exitcode)
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+1:
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+
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+ /* Get the new shadow stack pointer. */
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+ rdsspd %eax
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+
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+ /* Use the restore stoken to restore the original shadow stack. */
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+ rstorssp -8(%esi)
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+
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+ /* Save the restore token on the new shadow stack. */
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+ saveprevssp
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+
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+ /* Store the new shadow stack pointer in __ssp[0]. */
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+ movl %eax, oSSP(%edi)
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+
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+ /* Restore the original stack. */
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+ mov %edx, %esp
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+
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+ cfi_startproc
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+
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+ /* Restore ESI from the second scratch register slot. */
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+ movl oSCRATCH2(%edi), %esi
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+ /* Restore EDI from the third scratch register slot. */
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+ movl oSCRATCH3(%edi), %edi
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+
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+ ret
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+
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+L(skip_ssp):
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+#endif
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+
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/* If the function we call returns we must continue with the
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context which is given in the uc_link element. To do this
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set the return address for the function the user provides
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@@ -123,6 +245,7 @@ L(call_exit):
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call HIDDEN_JUMPTARGET(exit)
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/* The 'exit' call should never return. In case it does cause
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the process to terminate. */
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+L(hlt):
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hlt
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cfi_startproc
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END(__makecontext)
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diff --git a/sysdeps/unix/sysv/linux/i386/setcontext.S b/sysdeps/unix/sysv/linux/i386/setcontext.S
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index 7565d7d..7b58918 100644
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--- a/sysdeps/unix/sysv/linux/i386/setcontext.S
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+++ b/sysdeps/unix/sysv/linux/i386/setcontext.S
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@@ -18,6 +18,7 @@
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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+#include <asm/prctl.h>
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#include "ucontext_i.h"
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@@ -56,9 +57,6 @@ ENTRY(__setcontext)
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movl oFS(%eax), %ecx
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movw %cx, %fs
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- /* Fetch the address to return to. */
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- movl oEIP(%eax), %ecx
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-
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/* Load the new stack pointer. */
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cfi_def_cfa (eax, 0)
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cfi_offset (edi, oEDI)
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@@ -67,6 +65,103 @@ ENTRY(__setcontext)
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cfi_offset (ebx, oEBX)
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movl oESP(%eax), %esp
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+#if SHSTK_ENABLED
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+ /* Check if Shadow Stack is enabled. */
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+ testl $X86_FEATURE_1_SHSTK, %gs:FEATURE_1_OFFSET
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+ jz L(no_shstk)
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+
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+ /* If the base of the target shadow stack is the same as the
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+ base of the current shadow stack, we unwind the shadow
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+ stack. Otherwise it is a stack switch and we look for a
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+ restore token. */
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+ movl oSSP(%eax), %esi
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+ movl %esi, %edi
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+
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+ /* Get the base of the target shadow stack. */
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+ movl (oSSP + 4)(%eax), %ecx
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+ cmpl %gs:SSP_BASE_OFFSET, %ecx
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+ je L(unwind_shadow_stack)
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+
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+ /* Align the saved original shadow stack pointer to the next
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+ 8 byte aligned boundary. */
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+ andl $-8, %esi
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+
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+L(find_restore_token_loop):
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+ /* Look for a restore token. */
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+ movl -8(%esi), %ebx
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+ andl $-8, %ebx
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+ cmpl %esi, %ebx
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+ je L(restore_shadow_stack)
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+
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+ /* Try the next slot. */
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+ subl $8, %esi
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+ jmp L(find_restore_token_loop)
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+
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+L(restore_shadow_stack):
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+ /* Pop return address from the shadow stack since setcontext
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+ will not return. */
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+ movl $1, %ebx
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+ incsspd %ebx
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+
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+ /* Use the restore stoken to restore the target shadow stack. */
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+ rstorssp -8(%esi)
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+
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+ /* Save the restore token on the old shadow stack. NB: This
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+ restore token may be checked by setcontext or swapcontext
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+ later. */
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+ saveprevssp
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+
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+ /* Record the new shadow stack base that was switched to. */
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+ movl (oSSP + 4)(%eax), %ebx
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+ movl %ebx, %gs:SSP_BASE_OFFSET
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+
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+L(unwind_shadow_stack):
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+ rdsspd %ebx
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+ subl %edi, %ebx
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+ je L(skip_unwind_shadow_stack)
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+ negl %ebx
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+ shrl $2, %ebx
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+ movl $255, %esi
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+L(loop):
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+ cmpl %esi, %ebx
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+ cmovb %ebx, %esi
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+ incsspd %esi
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+ subl %esi, %ebx
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+ ja L(loop)
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+
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+L(skip_unwind_shadow_stack):
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+
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+ /* Load the values of all the preserved registers (except ESP). */
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+ movl oEDI(%eax), %edi
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+ movl oESI(%eax), %esi
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+ movl oEBP(%eax), %ebp
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+ movl oEBX(%eax), %ebx
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+
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+ /* Get the return address set with getcontext. */
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+ movl oEIP(%eax), %ecx
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+
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+ /* Check if return address is valid for the case when setcontext
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+ is invoked from L(exitcode) with linked context. */
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+ rdsspd %eax
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+ cmpl (%eax), %ecx
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+ /* Clear EAX to indicate success. NB: Don't use xorl to keep
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+ EFLAGS for jne. */
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+ movl $0, %eax
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+ jne L(jmp)
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+ /* Return to the new context if return address valid. */
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+ pushl %ecx
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+ ret
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+
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+L(jmp):
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+ /* Jump to the new context directly. */
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+ jmp *%ecx
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+
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+L(no_shstk):
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+#endif
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+
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+ /* Fetch the address to return to. */
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+ movl oEIP(%eax), %ecx
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+
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/* Push the return address on the new stack so we can return there. */
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pushl %ecx
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diff --git a/sysdeps/unix/sysv/linux/i386/swapcontext.S b/sysdeps/unix/sysv/linux/i386/swapcontext.S
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index ce27d51..d1b648c 100644
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--- a/sysdeps/unix/sysv/linux/i386/swapcontext.S
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+++ b/sysdeps/unix/sysv/linux/i386/swapcontext.S
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@@ -18,6 +18,7 @@
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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+#include <asm/prctl.h>
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#include "ucontext_i.h"
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@@ -76,6 +77,144 @@ ENTRY(__swapcontext)
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movl oFS(%eax), %edx
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movw %dx, %fs
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+#if SHSTK_ENABLED
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+ /* Check if Shadow Stack is enabled. */
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+ testl $X86_FEATURE_1_SHSTK, %gs:FEATURE_1_OFFSET
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+ jz L(no_shstk)
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+
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+ xorl %eax, %eax
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+ cmpl %gs:SSP_BASE_OFFSET, %eax
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+ jnz L(shadow_stack_bound_recorded)
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+
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+ /* Get the base address and size of the default shadow stack
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+ which must be the current shadow stack since nothing has
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+ been recorded yet. */
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+ sub $24, %esp
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+ mov %esp, %ecx
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+ movl $ARCH_CET_STATUS, %ebx
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+ movl $__NR_arch_prctl, %eax
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+ ENTER_KERNEL
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+ testl %eax, %eax
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+ jz L(continue_no_err)
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+
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+ /* This should never happen. */
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+ hlt
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+
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+L(continue_no_err):
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+ /* Record the base of the current shadow stack. */
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+ movl 8(%esp), %eax
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+ movl %eax, %gs:SSP_BASE_OFFSET
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+ add $24, %esp
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+
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+L(shadow_stack_bound_recorded):
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+ /* Load address of the context data structure we save in. */
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+ movl 4(%esp), %eax
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+
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+ /* Load address of the context data structure we swap in */
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+ movl 8(%esp), %edx
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+
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+ /* If we unwind the stack, we can't undo stack unwinding. Just
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+ save the target shadow stack pointer as the current shadow
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+ stack pointer. */
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+ movl oSSP(%edx), %ecx
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+ movl %ecx, oSSP(%eax)
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+
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+ /* Save the current shadow stack base in ucontext. */
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+ movl %gs:SSP_BASE_OFFSET, %ecx
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+ movl %ecx, (oSSP + 4)(%eax)
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+
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+ /* If the base of the target shadow stack is the same as the
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+ base of the current shadow stack, we unwind the shadow
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+ stack. Otherwise it is a stack switch and we look for a
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+ restore token. */
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+ movl oSSP(%edx), %esi
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+ movl %esi, %edi
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+
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+ /* Get the base of the target shadow stack. */
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+ movl (oSSP + 4)(%edx), %ecx
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+ cmpl %gs:SSP_BASE_OFFSET, %ecx
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+ je L(unwind_shadow_stack)
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+
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+ /* Align the saved original shadow stack pointer to the next
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+ 8 byte aligned boundary. */
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+ andl $-8, %esi
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+
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+L(find_restore_token_loop):
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+ /* Look for a restore token. */
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+ movl -8(%esi), %ebx
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+ andl $-8, %ebx
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+ cmpl %esi, %ebx
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+ je L(restore_shadow_stack)
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+
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+ /* Try the next slot. */
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+ subl $8, %esi
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+ jmp L(find_restore_token_loop)
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+
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+L(restore_shadow_stack):
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+ /* The target shadow stack will be restored. Save the current
|
|
+ shadow stack pointer. */
|
|
+ rdsspd %ecx
|
|
+ movl %ecx, oSSP(%eax)
|
|
+
|
|
+ /* Use the restore stoken to restore the target shadow stack. */
|
|
+ rstorssp -8(%esi)
|
|
+
|
|
+ /* Save the restore token on the old shadow stack. NB: This
|
|
+ restore token may be checked by setcontext or swapcontext
|
|
+ later. */
|
|
+ saveprevssp
|
|
+
|
|
+ /* Record the new shadow stack base that was switched to. */
|
|
+ movl (oSSP + 4)(%edx), %ebx
|
|
+ movl %ebx, %gs:SSP_BASE_OFFSET
|
|
+
|
|
+L(unwind_shadow_stack):
|
|
+ rdsspd %ebx
|
|
+ subl %edi, %ebx
|
|
+ je L(skip_unwind_shadow_stack)
|
|
+ negl %ebx
|
|
+ shrl $2, %ebx
|
|
+ movl $255, %esi
|
|
+L(loop):
|
|
+ cmpl %esi, %ebx
|
|
+ cmovb %ebx, %esi
|
|
+ incsspd %esi
|
|
+ subl %esi, %ebx
|
|
+ ja L(loop)
|
|
+
|
|
+L(skip_unwind_shadow_stack):
|
|
+
|
|
+ /* Load the new stack pointer. */
|
|
+ movl oESP(%edx), %esp
|
|
+
|
|
+ /* Load the values of all the preserved registers (except ESP). */
|
|
+ movl oEDI(%edx), %edi
|
|
+ movl oESI(%edx), %esi
|
|
+ movl oEBP(%edx), %ebp
|
|
+ movl oEBX(%edx), %ebx
|
|
+
|
|
+ /* Get the return address set with getcontext. */
|
|
+ movl oEIP(%edx), %ecx
|
|
+
|
|
+ /* Check if return address is valid for the case when setcontext
|
|
+ is invoked from L(exitcode) with linked context. */
|
|
+ rdsspd %eax
|
|
+ cmpl (%eax), %ecx
|
|
+ /* Clear EAX to indicate success. NB: Don't use xorl to keep
|
|
+ EFLAGS for jne. */
|
|
+ movl $0, %eax
|
|
+ jne L(jmp)
|
|
+ /* Return to the new context if return address valid. */
|
|
+ pushl %ecx
|
|
+ ret
|
|
+
|
|
+L(jmp):
|
|
+ /* Jump to the new context directly. */
|
|
+ jmp *%ecx
|
|
+
|
|
+L(no_shstk):
|
|
+#endif
|
|
+
|
|
/* Fetch the address to return to. */
|
|
movl oEIP(%eax), %ecx
|
|
|
|
diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.h b/sysdeps/unix/sysv/linux/i386/sysdep.h
|
|
index 3255cc7..9344ac7 100644
|
|
--- a/sysdeps/unix/sysv/linux/i386/sysdep.h
|
|
+++ b/sysdeps/unix/sysv/linux/i386/sysdep.h
|
|
@@ -656,4 +656,9 @@ struct libc_do_syscall_args
|
|
# endif
|
|
#endif
|
|
|
|
+/* Each shadow stack slot takes 4 bytes. Assuming that each stack
|
|
+ frame takes 128 bytes, this is used to compute shadow stack size
|
|
+ from stack size. */
|
|
+#define STACK_SIZE_TO_SHADOW_STACK_SIZE_SHIFT 5
|
|
+
|
|
#endif /* linux/i386/sysdep.h */
|
|
diff --git a/sysdeps/unix/sysv/linux/i386/ucontext_i.sym b/sysdeps/unix/sysv/linux/i386/ucontext_i.sym
|
|
index 1dfe03d..1d8608e 100644
|
|
--- a/sysdeps/unix/sysv/linux/i386/ucontext_i.sym
|
|
+++ b/sysdeps/unix/sysv/linux/i386/ucontext_i.sym
|
|
@@ -22,6 +22,10 @@ oEBP mreg (EBP)
|
|
oESP mreg (ESP)
|
|
oEBX mreg (EBX)
|
|
oEIP mreg (EIP)
|
|
+oSCRATCH1 mreg (EAX)
|
|
+oSCRATCH2 mreg (ECX)
|
|
+oSCRATCH3 mreg (EDX)
|
|
oFPREGS mcontext (fpregs)
|
|
oSIGMASK ucontext (uc_sigmask)
|
|
oFPREGSMEM ucontext (__fpregs_mem)
|
|
+oSSP ucontext (__ssp)
|
|
|