diff options
Diffstat (limited to 'include/asm-i386')
| -rw-r--r-- | include/asm-i386/Kbuild | 9 | ||||
| -rw-r--r-- | include/asm-i386/system.h | 8 |
2 files changed, 14 insertions, 3 deletions
diff --git a/include/asm-i386/Kbuild b/include/asm-i386/Kbuild index 2308190321d..b75a348d0c1 100644 --- a/include/asm-i386/Kbuild +++ b/include/asm-i386/Kbuild @@ -1,5 +1,10 @@ include include/asm-generic/Kbuild.asm -header-y += boot.h debugreg.h ldt.h ucontext.h +header-y += boot.h +header-y += debugreg.h +header-y += ldt.h +header-y += ucontext.h -unifdef-y += mtrr.h setup.h vm86.h +unifdef-y += mtrr.h +unifdef-y += setup.h +unifdef-y += vm86.h diff --git a/include/asm-i386/system.h b/include/asm-i386/system.h index 49928eb33f8..098bcee94e3 100644 --- a/include/asm-i386/system.h +++ b/include/asm-i386/system.h @@ -11,9 +11,14 @@ struct task_struct; /* one of the stranger aspects of C forward declarations.. */ extern struct task_struct * FASTCALL(__switch_to(struct task_struct *prev, struct task_struct *next)); +/* + * Saving eflags is important. It switches not only IOPL between tasks, + * it also protects other tasks from NT leaking through sysenter etc. + */ #define switch_to(prev,next,last) do { \ unsigned long esi,edi; \ - asm volatile("pushl %%ebp\n\t" \ + asm volatile("pushfl\n\t" /* Save flags */ \ + "pushl %%ebp\n\t" \ "movl %%esp,%0\n\t" /* save ESP */ \ "movl %5,%%esp\n\t" /* restore ESP */ \ "movl $1f,%1\n\t" /* save EIP */ \ @@ -21,6 +26,7 @@ extern struct task_struct * FASTCALL(__switch_to(struct task_struct *prev, struc "jmp __switch_to\n" \ "1:\t" \ "popl %%ebp\n\t" \ + "popfl" \ :"=m" (prev->thread.esp),"=m" (prev->thread.eip), \ "=a" (last),"=S" (esi),"=D" (edi) \ :"m" (next->thread.esp),"m" (next->thread.eip), \ |