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| author |   Yury Khrustalev <yury.khrustalev@arm.com> | 2025-01-13 17:06:17 +0000 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2025-02-17 18:11:18 +0000 |
| commit | 6d61527d931ba07bca691f204cdf3201b280879d (patch) | |
| tree | 3cffd4b876c1a330f4fdc0f6fe2c19b123d99ff3 | |
| parent | Linux 6.14-rc3 (diff) | |
| download | wireguard-linux-6d61527d931ba07bca691f204cdf3201b280879d.tar.xz wireguard-linux-6d61527d931ba07bca691f204cdf3201b280879d.zip | |
mm/pkey: Add PKEY_UNRESTRICTED macro
Memory protection keys (pkeys) uapi has two macros for pkeys restrictions:
- PKEY_DISABLE_ACCESS 0x1
- PKEY_DISABLE_WRITE 0x2
with implicit literal value of 0x0 that means "unrestricted". Code that
works with pkeys has to use this literal value when implying that a pkey
imposes no restrictions. This may reduce readability because 0 can be
written in various ways (e.g. 0x0 or 0) and also because 0 in the context
of pkeys can be mistaken for "no permissions" (akin PROT_NONE) while it
actually means "no restrictions". This is important because pkeys are
oftentimes used near mprotect() that uses PROT_ macros.
This patch adds PKEY_UNRESTRICTED macro defined as 0x0.
Signed-off-by: Yury Khrustalev <yury.khrustalev@arm.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Kevin Brodsky <kevin.brodsky@arm.com>
Link: https://lore.kernel.org/r/20250113170619.484698-2-yury.khrustalev@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to '')
| -rw-r--r-- | include/uapi/asm-generic/mman-common.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h index 1ea2c4c33b86..ef1c27fa3c57 100644 --- a/include/uapi/asm-generic/mman-common.h +++ b/include/uapi/asm-generic/mman-common.h @@ -85,6 +85,7 @@ /* compatibility flags */ #define MAP_FILE 0 +#define PKEY_UNRESTRICTED 0x0 #define PKEY_DISABLE_ACCESS 0x1 #define PKEY_DISABLE_WRITE 0x2 #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\ |