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| author | Joey Gouly <joey.gouly@arm.com> | 2024-10-01 14:36:17 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2024-10-14 17:22:47 +0100 |
| commit | e3e85271330b18f487ab3032ea9ca0601efeafaf (patch) | |
| tree | 0ff5a0449c5c9b99ed840aba998c4d999f519003 /arch | |
| parent | 13f8f1e05f1dc36dbba6cba0ae03354c0dafcde7 (diff) | |
| download | lwn-e3e85271330b18f487ab3032ea9ca0601efeafaf.tar.gz lwn-e3e85271330b18f487ab3032ea9ca0601efeafaf.zip | |
arm64: set POR_EL0 for kernel threads
Restrict kernel threads to only have RWX overlays for pkey 0. This matches
what arch/x86 does, by defaulting to a restrictive PKRU.
Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Kevin Brodsky <Kevin.Brodsky@arm.com>
Link: https://lore.kernel.org/r/20241001133618.1547996-2-joey.gouly@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kernel/process.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index 0540653fbf38..3e7c8c8195c3 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -412,6 +412,9 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) p->thread.cpu_context.x19 = (unsigned long)args->fn; p->thread.cpu_context.x20 = (unsigned long)args->fn_arg; + + if (system_supports_poe()) + p->thread.por_el0 = POR_EL0_INIT; } p->thread.cpu_context.pc = (unsigned long)ret_from_fork; p->thread.cpu_context.sp = (unsigned long)childregs; |