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Diffstat (limited to 'arch/x86_64/mm/init.c')
-rw-r--r--arch/x86_64/mm/init.c26
1 files changed, 8 insertions, 18 deletions
diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c
index b0d604551d8..dbe53b4c7e6 100644
--- a/arch/x86_64/mm/init.c
+++ b/arch/x86_64/mm/init.c
@@ -583,9 +583,9 @@ static __init int x8664_sysctl_init(void)
__initcall(x8664_sysctl_init);
#endif
-/* Pseudo VMAs to allow ptrace access for the vsyscall pages. x86-64 has two
- different ones: one for 32bit and one for 64bit. Use the appropiate
- for the target task. */
+/* A pseudo VMAs to allow ptrace access for the vsyscall page. This only
+ covers the 64bit vsyscall page now. 32bit has a real VMA now and does
+ not need special handling anymore. */
static struct vm_area_struct gate_vma = {
.vm_start = VSYSCALL_START,
@@ -593,22 +593,11 @@ static struct vm_area_struct gate_vma = {
.vm_page_prot = PAGE_READONLY
};
-static struct vm_area_struct gate32_vma = {
- .vm_start = VSYSCALL32_BASE,
- .vm_end = VSYSCALL32_END,
- .vm_page_prot = PAGE_READONLY
-};
-
struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
{
#ifdef CONFIG_IA32_EMULATION
- if (test_tsk_thread_flag(tsk, TIF_IA32)) {
- /* lookup code assumes the pages are present. set them up
- now */
- if (__map_syscall32(tsk->mm, VSYSCALL32_BASE) < 0)
- return NULL;
- return &gate32_vma;
- }
+ if (test_tsk_thread_flag(tsk, TIF_IA32))
+ return NULL;
#endif
return &gate_vma;
}
@@ -616,6 +605,8 @@ struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
int in_gate_area(struct task_struct *task, unsigned long addr)
{
struct vm_area_struct *vma = get_gate_vma(task);
+ if (!vma)
+ return 0;
return (addr >= vma->vm_start) && (addr < vma->vm_end);
}
@@ -625,6 +616,5 @@ int in_gate_area(struct task_struct *task, unsigned long addr)
*/
int in_gate_area_no_task(unsigned long addr)
{
- return (((addr >= VSYSCALL_START) && (addr < VSYSCALL_END)) ||
- ((addr >= VSYSCALL32_BASE) && (addr < VSYSCALL32_END)));
+ return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END);
}