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vdso: Fetch page frame number on init

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We will need it in parasite code to detect run time vdso area.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Cyrill Gorcunov
2013-05-24 01:42:16 +04:00
committed by Pavel Emelyanov
parent f267443134
commit bc66eb535c
3 changed files with 31 additions and 1 deletions
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1
arch/arm/vdso.c
View File

@@ -9,6 +9,7 @@
#define LOG_PREFIX "vdso: "
struct vdso_symtable vdso_sym_rt = VDSO_SYMTABLE_INIT;
u64 vdso_pfn = VDSO_BAD_PFN;
int vdso_init(void)
{

28
arch/x86/vdso.c
View File

@@ -15,6 +15,7 @@
#include "crtools.h"
#include "kerndat.h"
#include "vdso.h"
#include "util.h"
#include "log.h"
#include "mem.h"
@@ -24,6 +25,7 @@
#define LOG_PREFIX "vdso: "
struct vdso_symtable vdso_sym_rt = VDSO_SYMTABLE_INIT;
u64 vdso_pfn = VDSO_BAD_PFN;
static int vdso_fill_self_symtable(struct vdso_symtable *s)
{
@@ -65,7 +67,31 @@ static int vdso_fill_self_symtable(struct vdso_symtable *s)
int vdso_init(void)
{
int ret = -1, fd;
off_t off;
if (vdso_fill_self_symtable(&vdso_sym_rt))
return -1;
return 0;
fd = open_proc(getpid(), "pagemap");
if (fd < 0)
return -1;
off = (vdso_sym_rt.vma_start / PAGE_SIZE) * sizeof(u64);
if (lseek(fd, off, SEEK_SET) != off) {
pr_perror("Failed to seek address %lx\n", vdso_sym_rt.vma_start);
goto out;
}
ret = read(fd, &vdso_pfn, sizeof(vdso_pfn));
if (ret < 0 || ret != sizeof(vdso_pfn)) {
pr_perror("Can't read pme for pid %d", getpid());
ret = -1;
} else {
vdso_pfn = PME_PFRAME(vdso_pfn);
ret = 0;
}
out:
close(fd);
return ret;
}

3
include/vdso.h
View File

@@ -4,6 +4,7 @@
#include <sys/mman.h>
#include "asm/vdso.h"
#include "asm/int.h"
#define VDSO_PROT (PROT_READ | PROT_EXEC)
@@ -26,6 +27,7 @@ enum {
#define VDSO_SYMBOL_TIME_NAME "__vdso_time"
#define VDSO_BAD_ADDR (-1ul)
#define VDSO_BAD_PFN (-1ull)
struct vdso_symbol {
char name[32];
@@ -67,6 +69,7 @@ static inline unsigned long vdso_vma_size(struct vdso_symtable *t)
}
extern struct vdso_symtable vdso_sym_rt;
extern u64 vdso_pfn;
extern int vdso_init(void);
#endif /* __CR_VDSO_H__ */