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Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c26
1 files changed, 18 insertions, 8 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 9da8cab1b1b0..b623a249918c 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1410,6 +1410,13 @@ no_page_table:
return page;
}
+static inline int stack_guard_page(struct vm_area_struct *vma, unsigned long addr)
+{
+ return (vma->vm_flags & VM_GROWSDOWN) &&
+ (vma->vm_start == addr) &&
+ !vma_stack_continue(vma->vm_prev, addr);
+}
+
/**
* __get_user_pages() - pin user pages in memory
* @tsk: task_struct of target task
@@ -1488,7 +1495,6 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
vma = find_extend_vma(mm, start);
if (!vma && in_gate_area(mm, start)) {
unsigned long pg = start & PAGE_MASK;
- struct vm_area_struct *gate_vma = get_gate_vma(mm);
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
@@ -1513,10 +1519,11 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
pte_unmap(pte);
return i ? : -EFAULT;
}
+ vma = get_gate_vma(mm);
if (pages) {
struct page *page;
- page = vm_normal_page(gate_vma, start, *pte);
+ page = vm_normal_page(vma, start, *pte);
if (!page) {
if (!(gup_flags & FOLL_DUMP) &&
is_zero_pfn(pte_pfn(*pte)))
@@ -1530,12 +1537,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
get_page(page);
}
pte_unmap(pte);
- if (vmas)
- vmas[i] = gate_vma;
- i++;
- start += PAGE_SIZE;
- nr_pages--;
- continue;
+ goto next_page;
}
if (!vma ||
@@ -1549,6 +1551,13 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
continue;
}
+ /*
+ * If we don't actually want the page itself,
+ * and it's the stack guard page, just skip it.
+ */
+ if (!pages && stack_guard_page(vma, start))
+ goto next_page;
+
do {
struct page *page;
unsigned int foll_flags = gup_flags;
@@ -1631,6 +1640,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
flush_anon_page(vma, page, start);
flush_dcache_page(page);
}
+next_page:
if (vmas)
vmas[i] = vma;
i++;