doc/share/security/patches/SA-19:01/syscall.patch
2019-02-05 18:38:28 +00:00

19 lines
463 B
Diff

--- sys/amd64/amd64/exception.S.orig
+++ sys/amd64/amd64/exception.S
@@ -521,12 +521,14 @@
movq TF_RFLAGS(%rsp),%r11 /* original %rflags */
movq TF_RIP(%rsp),%rcx /* original %rip */
movq TF_RSP(%rsp),%rsp /* user stack pointer */
+ xorl %r8d,%r8d /* zero the rest of GPRs */
+ xorl %r10d,%r10d
cmpq $~0,PCPU(UCR3)
je 2f
movq PCPU(UCR3),%r9
movq %r9,%cr3
- xorl %r9d,%r9d
-2: swapgs
+2: xorl %r9d,%r9d
+ swapgs
sysretq
3: /* AST scheduled. */