diff options
Diffstat (limited to 'mm/mremap.c')
| -rw-r--r-- | mm/mremap.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/mm/mremap.c b/mm/mremap.c index 30d7d2482eea..8779928d6a70 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -22,6 +22,7 @@ #include <linux/mmu_notifier.h> #include <linux/uaccess.h> #include <linux/mm-arch-hooks.h> +#include <linux/userfaultfd_k.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> @@ -250,7 +251,8 @@ unsigned long move_page_tables(struct vm_area_struct *vma, static unsigned long move_vma(struct vm_area_struct *vma, unsigned long old_addr, unsigned long old_len, - unsigned long new_len, unsigned long new_addr, bool *locked) + unsigned long new_len, unsigned long new_addr, + bool *locked, struct vm_userfaultfd_ctx *uf) { struct mm_struct *mm = vma->vm_mm; struct vm_area_struct *new_vma; @@ -309,6 +311,7 @@ static unsigned long move_vma(struct vm_area_struct *vma, old_addr = new_addr; new_addr = err; } else { + mremap_userfaultfd_prep(new_vma, uf); arch_remap(mm, old_addr, old_addr + old_len, new_addr, new_addr + new_len); } @@ -413,7 +416,8 @@ static struct vm_area_struct *vma_to_resize(unsigned long addr, } static unsigned long mremap_to(unsigned long addr, unsigned long old_len, - unsigned long new_addr, unsigned long new_len, bool *locked) + unsigned long new_addr, unsigned long new_len, bool *locked, + struct vm_userfaultfd_ctx *uf) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; @@ -458,7 +462,7 @@ static unsigned long mremap_to(unsigned long addr, unsigned long old_len, if (offset_in_page(ret)) goto out1; - ret = move_vma(vma, addr, old_len, new_len, new_addr, locked); + ret = move_vma(vma, addr, old_len, new_len, new_addr, locked, uf); if (!(offset_in_page(ret))) goto out; out1: @@ -497,6 +501,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, unsigned long ret = -EINVAL; unsigned long charged = 0; bool locked = false; + struct vm_userfaultfd_ctx uf = NULL_VM_UFFD_CTX; if (flags & ~(MREMAP_FIXED | MREMAP_MAYMOVE)) return ret; @@ -523,7 +528,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, if (flags & MREMAP_FIXED) { ret = mremap_to(addr, old_len, new_addr, new_len, - &locked); + &locked, &uf); goto out; } @@ -592,7 +597,8 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, goto out; } - ret = move_vma(vma, addr, old_len, new_len, new_addr, &locked); + ret = move_vma(vma, addr, old_len, new_len, new_addr, + &locked, &uf); } out: if (offset_in_page(ret)) { @@ -602,5 +608,6 @@ out: up_write(¤t->mm->mmap_sem); if (locked && new_len > old_len) mm_populate(new_addr + old_len, new_len - old_len); + mremap_userfaultfd_complete(&uf, addr, new_addr, old_len); return ret; } |