Messages in this thread Patch in this message | | | From | Andrey Konovalov <> | Subject | [PATCH v3 6/6] arm64: update Documentation/arm64/tagged-pointers.txt | Date | Fri, 25 May 2018 19:21:16 +0200 |
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Add a note that work on passing tagged user pointers to the kernel via syscalls has started, but might not be complete yet.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- Documentation/arm64/tagged-pointers.txt | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/Documentation/arm64/tagged-pointers.txt b/Documentation/arm64/tagged-pointers.txt index a25a99e82bb1..361481283f00 100644 --- a/Documentation/arm64/tagged-pointers.txt +++ b/Documentation/arm64/tagged-pointers.txt @@ -35,8 +35,9 @@ Using non-zero address tags in any of these locations may result in an error code being returned, a (fatal) signal being raised, or other modes of failure. -For these reasons, passing non-zero address tags to the kernel via -system calls is forbidden, and using a non-zero address tag for sp is +Some initial work for supporting non-zero address tags passed to the +kernel via system calls has been done, but the kernel doesn't provide +any guarantees at this point. Using a non-zero address tag for sp is strongly discouraged. Programs maintaining a frame pointer and frame records that use non-zero -- 2.17.0.921.gf22659ad46-goog
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