Messages in this thread Patch in this message | | | From | Andrey Konovalov <> | Subject | [PATCH v10 07/12] fs, arm64: untag user pointers in fs/userfaultfd.c | Date | Fri, 22 Feb 2019 13:53:19 +0100 |
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userfaultfd_register() and userfaultfd_unregister() use provided user pointers for vma lookups, which can only by done with untagged pointers.
Untag user pointers in these functions.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- fs/userfaultfd.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 89800fc7dc9d..a3b70e0d9756 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -1320,6 +1320,9 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx, goto out; } + uffdio_register.range.start = + untagged_addr(uffdio_register.range.start); + ret = validate_range(mm, uffdio_register.range.start, uffdio_register.range.len); if (ret) @@ -1507,6 +1510,8 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx, if (copy_from_user(&uffdio_unregister, buf, sizeof(uffdio_unregister))) goto out; + uffdio_unregister.start = untagged_addr(uffdio_unregister.start); + ret = validate_range(mm, uffdio_unregister.start, uffdio_unregister.len); if (ret) -- 2.21.0.rc0.258.g878e2cd30e-goog
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