diff options
Diffstat (limited to 'fs/userfaultfd.c')
| -rw-r--r-- | fs/userfaultfd.c | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index f6e0f0c0d0e5..5c2d806e6ae5 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -1236,23 +1236,21 @@ static __always_inline void wake_userfault(struct userfaultfd_ctx *ctx, } static __always_inline int validate_range(struct mm_struct *mm, - __u64 *start, __u64 len) + __u64 start, __u64 len) { __u64 task_size = mm->task_size; - *start = untagged_addr(*start); - - if (*start & ~PAGE_MASK) + if (start & ~PAGE_MASK) return -EINVAL; if (len & ~PAGE_MASK) return -EINVAL; if (!len) return -EINVAL; - if (*start < mmap_min_addr) + if (start < mmap_min_addr) return -EINVAL; - if (*start >= task_size) + if (start >= task_size) return -EINVAL; - if (len > task_size - *start) + if (len > task_size - start) return -EINVAL; return 0; } @@ -1316,7 +1314,7 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx, vm_flags |= VM_UFFD_MINOR; } - ret = validate_range(mm, &uffdio_register.range.start, + ret = validate_range(mm, uffdio_register.range.start, uffdio_register.range.len); if (ret) goto out; @@ -1522,7 +1520,7 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx, if (copy_from_user(&uffdio_unregister, buf, sizeof(uffdio_unregister))) goto out; - ret = validate_range(mm, &uffdio_unregister.start, + ret = validate_range(mm, uffdio_unregister.start, uffdio_unregister.len); if (ret) goto out; @@ -1671,7 +1669,7 @@ static int userfaultfd_wake(struct userfaultfd_ctx *ctx, if (copy_from_user(&uffdio_wake, buf, sizeof(uffdio_wake))) goto out; - ret = validate_range(ctx->mm, &uffdio_wake.start, uffdio_wake.len); + ret = validate_range(ctx->mm, uffdio_wake.start, uffdio_wake.len); if (ret) goto out; @@ -1711,7 +1709,7 @@ static int userfaultfd_copy(struct userfaultfd_ctx *ctx, sizeof(uffdio_copy)-sizeof(__s64))) goto out; - ret = validate_range(ctx->mm, &uffdio_copy.dst, uffdio_copy.len); + ret = validate_range(ctx->mm, uffdio_copy.dst, uffdio_copy.len); if (ret) goto out; /* @@ -1768,7 +1766,7 @@ static int userfaultfd_zeropage(struct userfaultfd_ctx *ctx, sizeof(uffdio_zeropage)-sizeof(__s64))) goto out; - ret = validate_range(ctx->mm, &uffdio_zeropage.range.start, + ret = validate_range(ctx->mm, uffdio_zeropage.range.start, uffdio_zeropage.range.len); if (ret) goto out; @@ -1818,7 +1816,7 @@ static int userfaultfd_writeprotect(struct userfaultfd_ctx *ctx, sizeof(struct uffdio_writeprotect))) return -EFAULT; - ret = validate_range(ctx->mm, &uffdio_wp.range.start, + ret = validate_range(ctx->mm, uffdio_wp.range.start, uffdio_wp.range.len); if (ret) return ret; @@ -1866,7 +1864,7 @@ static int userfaultfd_continue(struct userfaultfd_ctx *ctx, unsigned long arg) sizeof(uffdio_continue) - (sizeof(__s64)))) goto out; - ret = validate_range(ctx->mm, &uffdio_continue.range.start, + ret = validate_range(ctx->mm, uffdio_continue.range.start, uffdio_continue.range.len); if (ret) goto out; |