[PATCH v2 6/6] arm64: update Documentation/arm64/tagged-pointers.txt

[PATCH v2 0/6] arm64: untag user pointers passed to the kernel · Andrey Konovalov <hidden> · 2018-05-03
[PATCH v2 1/6] arm64: add type casts to untagged_addr macro · Andrey Konovalov <hidden> · 2018-05-03
[PATCH v2 2/6] uaccess: add untagged_addr definition for other arches · Andrey Konovalov <hidden> · 2018-05-03
[PATCH v2 3/6] arm64: untag user addresses in access_ok and __uaccess_mask_ptr · Andrey Konovalov <hidden> · 2018-05-03
[PATCH v2 4/6] mm, arm64: untag user addresses in mm/gup.c · Andrey Konovalov <hidden> · 2018-05-03
[PATCH v2 5/6] lib, arm64: untag addrs passed to strncpy_from_user and strnlen_user · Andrey Konovalov <hidden> · 2018-05-03
[PATCH v2 6/6] arm64: update Documentation/arm64/tagged-pointers.txt · Andrey Konovalov <hidden> · 2018-05-03

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Revisions (26)

2018-03-09 rfc [diff vs current]
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2018-04-18 v1 [diff vs current]
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From: Andrey Konovalov <hidden>
Date: 2018-05-03 14:15:44
Also in: linux-doc, linux-mm, lkml
Subsystem: documentation, the rest · Maintainers: Jonathan Corbet, Linus Torvalds

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 <redacted>
---
 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

-- 
2.17.0.441.gb46fe60e1d-goog

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