mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 13:22:23 +00:00
103efcd9aa
The final line of /proc/<pid>/maps on x86_64 for native 64-bit
tasks shows an incorrect ending address and incorrect permissions. There
is only a single page mapped in this vsyscall region, and it is accessible
for both read and execute.
The patch below fixes this. (Since 32-bit-compat tasks have a real vma
with correct perms/range, no change is necessary for that scenario.)
Before the patch, a "cat /proc/self/maps | tail -1" shows this:
ffffffffff600000-ffffffffffe00000 ---p 00000000 [...]
After the patch, this is the output:
ffffffffff600000-ffffffffff601000 r-xp 00000000 [...]
Signed-off-by: Ernie Petrides <petrides@redhat.com>
Signed-off-by: Andi Kleen <ak@suse.de>
68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
#ifndef _ASM_X86_64_VSYSCALL_H_
|
|
#define _ASM_X86_64_VSYSCALL_H_
|
|
|
|
enum vsyscall_num {
|
|
__NR_vgettimeofday,
|
|
__NR_vtime,
|
|
__NR_vgetcpu,
|
|
};
|
|
|
|
#define VSYSCALL_START (-10UL << 20)
|
|
#define VSYSCALL_SIZE 1024
|
|
#define VSYSCALL_END (-2UL << 20)
|
|
#define VSYSCALL_MAPPED_PAGES 1
|
|
#define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr))
|
|
|
|
#ifdef __KERNEL__
|
|
#include <linux/seqlock.h>
|
|
|
|
#define __section_vxtime __attribute__ ((unused, __section__ (".vxtime"), aligned(16)))
|
|
#define __section_vgetcpu_mode __attribute__ ((unused, __section__ (".vgetcpu_mode"), aligned(16)))
|
|
#define __section_jiffies __attribute__ ((unused, __section__ (".jiffies"), aligned(16)))
|
|
#define __section_sys_tz __attribute__ ((unused, __section__ (".sys_tz"), aligned(16)))
|
|
#define __section_sysctl_vsyscall __attribute__ ((unused, __section__ (".sysctl_vsyscall"), aligned(16)))
|
|
#define __section_xtime __attribute__ ((unused, __section__ (".xtime"), aligned(16)))
|
|
#define __section_xtime_lock __attribute__ ((unused, __section__ (".xtime_lock"), aligned(16)))
|
|
|
|
#define VXTIME_TSC 1
|
|
#define VXTIME_HPET 2
|
|
#define VXTIME_PMTMR 3
|
|
|
|
#define VGETCPU_RDTSCP 1
|
|
#define VGETCPU_LSL 2
|
|
|
|
struct vxtime_data {
|
|
long hpet_address; /* HPET base address */
|
|
int last;
|
|
unsigned long last_tsc;
|
|
long quot;
|
|
long tsc_quot;
|
|
int mode;
|
|
};
|
|
|
|
#define hpet_readl(a) readl((const void __iomem *)fix_to_virt(FIX_HPET_BASE) + a)
|
|
#define hpet_writel(d,a) writel(d, (void __iomem *)fix_to_virt(FIX_HPET_BASE) + a)
|
|
|
|
/* vsyscall space (readonly) */
|
|
extern struct vxtime_data __vxtime;
|
|
extern int __vgetcpu_mode;
|
|
extern struct timespec __xtime;
|
|
extern volatile unsigned long __jiffies;
|
|
extern struct timezone __sys_tz;
|
|
extern seqlock_t __xtime_lock;
|
|
|
|
/* kernel space (writeable) */
|
|
extern struct vxtime_data vxtime;
|
|
extern int vgetcpu_mode;
|
|
extern struct timezone sys_tz;
|
|
extern int sysctl_vsyscall;
|
|
extern seqlock_t xtime_lock;
|
|
|
|
extern int sysctl_vsyscall;
|
|
|
|
#define ARCH_HAVE_XTIME_LOCK 1
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_X86_64_VSYSCALL_H_ */
|