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| author | Yury Khrustalev <yury.khrustalev@arm.com> | 2024-11-20 11:20:33 +0000 |
|---|---|---|
| committer | Wilco Dijkstra <wilco.dijkstra@arm.com> | 2024-11-20 11:30:58 +0000 |
| commit | 47311cca31e685fa7bfe19bb8cef17d2d3d7fff9 (patch) | |
| tree | 315d15f0e3b7d6d952f5680e6222a87a4c810b6e | |
| parent | f4d00dd60da0f8f520e7a7f71df3bc4d83cd4787 (diff) | |
| download | glibc-47311cca31e685fa7bfe19bb8cef17d2d3d7fff9.zip glibc-47311cca31e685fa7bfe19bb8cef17d2d3d7fff9.tar.gz glibc-47311cca31e685fa7bfe19bb8cef17d2d3d7fff9.tar.bz2 | |
manual: Add description of AArch64-specific pkey flags
Describe AArch64 specific flags PKEY_DISABLE_READ and PKEY_DISABLE_EXECUTE that
are available on AArch64 systems with enabled Stage 1 permission overlays
feature introduced in Armv8.9 / 9.4 (FEAT_S1POE).
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
| -rw-r--r-- | manual/memory.texi | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/manual/memory.texi b/manual/memory.texi index 324c120..dc4621e 100644 --- a/manual/memory.texi +++ b/manual/memory.texi @@ -3261,6 +3261,12 @@ the page protection flags are applied. Otherwise, @var{access_restrictions} is a combination of the following flags: @vtable @code +@item PKEY_DISABLE_READ +@standards{Linux, sys/mman.h} +Subsequent attempts to read from memory with the specified protection +key will fault. At present only AArch64 platforms with enabled Stage 1 +permission overlays feature support this type of restriction. + @item PKEY_DISABLE_WRITE @standards{Linux, sys/mman.h} Subsequent attempts to write to memory with the specified protection @@ -3269,7 +3275,15 @@ key will fault. @item PKEY_DISABLE_ACCESS @standards{Linux, sys/mman.h} Subsequent attempts to write to or read from memory with the specified -protection key will fault. +protection key will fault. On AArch64 platforms with enabled Stage 1 +permission overlays feature this restriction value has the same effect +as combination of @code{PKEY_DISABLE_READ} and @code{PKEY_DISABLE_WRITE}. + +@item PKEY_DISABLE_EXECUTE +@standards{Linux, sys/mman.h} +Subsequent attempts to execute from memory with the specified protection +key will fault. At present only AArch64 platforms with enabled Stage 1 +permission overlays feature support this type of restriction. @end vtable Operations not specified as flags are not restricted. In particular, |