x86-64: Rework vsyscall emulation and add vsyscall= parameter

There are three choices:

vsyscall=native: Vsyscalls are native code that issues the
corresponding syscalls.

vsyscall=emulate (default): Vsyscalls are emulated by instruction
fault traps, tested in the bad_area path.  The actual contents of
the vsyscall page is the same as the vsyscall=native case except
that it's marked NX.  This way programs that make assumptions about
what the code in the page does will not be confused when they read
that code.

vsyscall=none: Trying to execute a vsyscall will segfault.

Signed-off-by: Andy Lutomirski <luto@mit.edu>
Link: http://lkml.kernel.org/r/8449fb3abf89851fd6b2260972666a6f82542284.1312988155.git.luto@mit.edu
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 23 insertions, 13 deletions

diff --git a/arch/x86/kernel/vsyscall_emu_64.S b/arch/x86/kernel/vsyscall_emu_64.S
index ffa845eae5c..c9596a9af15 100644
--- a/arch/x86/kernel/vsyscall_emu_64.S
+++ b/arch/x86/kernel/vsyscall_emu_64.S
@@ -7,21 +7,31 @@
  */
 
 #include <linux/linkage.h>
+
 #include <asm/irq_vectors.h>
+#include <asm/page_types.h>
+#include <asm/unistd_64.h>
+
+__PAGE_ALIGNED_DATA
+        .globl __vsyscall_page
+        .balign PAGE_SIZE, 0xcc
+        .type __vsyscall_page, @object
+__vsyscall_page:
+
+        mov $__NR_gettimeofday, %rax
+        syscall
+        ret
 
-/* The unused parts of the page are filled with 0xcc by the linker script. */
+        .balign 1024, 0xcc
+        mov $__NR_time, %rax
+        syscall
+        ret
 
-.section .vsyscall_0, "a"
-ENTRY(vsyscall_0)
-        int $VSYSCALL_EMU_VECTOR
-END(vsyscall_0)
+        .balign 1024, 0xcc
+        mov $__NR_getcpu, %rax
+        syscall
+        ret
 
-.section .vsyscall_1, "a"
-ENTRY(vsyscall_1)
-        int $VSYSCALL_EMU_VECTOR
-END(vsyscall_1)
+        .balign 4096, 0xcc
 
-.section .vsyscall_2, "a"
-ENTRY(vsyscall_2)
-        int $VSYSCALL_EMU_VECTOR
-END(vsyscall_2)
+        .size __vsyscall_page, 4096