[PATCH] arm64: doc: Add brk/mmap/mremap() to the Tagged Address ABI Exceptions
Catalin Marinas
catalin.marinas at arm.com
Fri Apr 23 18:51:34 BST 2021
Prior to commit dcde237319e6 ("mm: Avoid creating virtual address
aliases in brk()/mmap()/mremap()"), the kernel allowed tagged addresses
to be passed to the brk/mmap/mremap() syscalls. This relaxation was
tightened in 5.6 (backported to stable 5.4) but the
tagged-address-abi.rst document was only partially updated.
Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
Fixes: dcde237319e6 ("mm: Avoid creating virtual address aliases in brk()/mmap()/mremap()")
Reported-by: Peter Maydell <peter.maydell at linaro.org>
Cc: Will Deacon <will at kernel.org>
Cc: Vincenzo Frascino <vincenzo.frascino at arm.com>
---
Documentation/arm64/tagged-address-abi.rst | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/Documentation/arm64/tagged-address-abi.rst b/Documentation/arm64/tagged-address-abi.rst
index cbc4d4500241..459e6b66ff68 100644
--- a/Documentation/arm64/tagged-address-abi.rst
+++ b/Documentation/arm64/tagged-address-abi.rst
@@ -113,6 +113,12 @@ ABI relaxation:
- ``shmat()`` and ``shmdt()``.
+- ``brk()`` (since kernel v5.6).
+
+- ``mmap()`` (since kernel v5.6).
+
+- ``mremap()``, the ``new_address`` argument (since kernel v5.6).
+
Any attempt to use non-zero tagged pointers may result in an error code
being returned, a (fatal) signal being raised, or other modes of
failure.
More information about the linux-arm-kernel
mailing list