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arm64: set POR_EL0 for kernel threads

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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>
This commit is contained in:
Joey Gouly 2024-10-01 14:36:17 +01:00 committed by Will Deacon
parent 13f8f1e05f
commit e3e8527133
1 changed files with 3 additions and 0 deletions
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3
arch/arm64/kernel/process.c
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@ -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;