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| author | Yeoreum Yun <yeoreum.yun@arm.com> | 2025-06-18 10:29:52 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2025-07-02 18:49:04 +0100 |
| commit | 4d51ff5bba00a13ca9b0b24883fa7adb07a167fc (patch) | |
| tree | ebf0c454f1a2124b318b70c82965cdb5b4fef521 /arch/arm64/kernel/process.c | |
| parent | prctl: Introduce PR_MTE_STORE_ONLY (diff) | |
| download | linux-4d51ff5bba00a13ca9b0b24883fa7adb07a167fc.tar.gz linux-4d51ff5bba00a13ca9b0b24883fa7adb07a167fc.zip | |
arm64/kernel: Support store-only mte tag check
Introduce new flag -- MTE_CTRL_STORE_ONLY used to set store-only tag check.
This flag isn't overridden by prefered tcf flag setting but set together
with prefered setting of way to report tag check fault.
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250618092957.2069907-4-yeoreum.yun@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel/process.c')
| -rw-r--r-- | arch/arm64/kernel/process.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index a5ca15daeb8a..fc49f2b3ded1 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -849,10 +849,14 @@ long set_tagged_addr_ctrl(struct task_struct *task, unsigned long arg) if (is_compat_thread(ti)) return -EINVAL; - if (system_supports_mte()) + if (system_supports_mte()) { valid_mask |= PR_MTE_TCF_SYNC | PR_MTE_TCF_ASYNC \ | PR_MTE_TAG_MASK; + if (cpus_have_cap(ARM64_MTE_STORE_ONLY)) + valid_mask |= PR_MTE_STORE_ONLY; + } + if (arg & ~valid_mask) return -EINVAL; |