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SubjectRe: [RFC v6 35/62] powerpc: Deliver SEGV signal on pkey violation
Ram Pai <linuxram@us.ibm.com> writes:

> diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
> index d4e545d..fe1e7c7 100644
> --- a/arch/powerpc/kernel/traps.c
> +++ b/arch/powerpc/kernel/traps.c
> @@ -20,6 +20,7 @@
> #include <linux/sched/debug.h>
> #include <linux/kernel.h>
> #include <linux/mm.h>
> +#include <linux/pkeys.h>
> #include <linux/stddef.h>
> #include <linux/unistd.h>
> #include <linux/ptrace.h>
> @@ -247,6 +248,15 @@ void user_single_step_siginfo(struct task_struct *tsk,
> info->si_addr = (void __user *)regs->nip;
> }
>
> +#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS
> +static void fill_sig_info_pkey(int si_code, siginfo_t *info, unsigned long addr)
> +{
> + if (si_code != SEGV_PKUERR)
> + return;

Given that SEGV_PKUERR is a signal specific si_code this test is
insufficient to detect an pkey error. You also need to check
that signr == SIGSEGV

> + info->si_pkey = get_paca()->paca_pkey;
> +}
> +#endif /* CONFIG_PPC64_MEMORY_PROTECTION_KEYS */
> +
> void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
> {
> siginfo_t info;
> @@ -274,6 +284,11 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
> info.si_signo = signr;
> info.si_code = code;
> info.si_addr = (void __user *) addr;
> +
> +#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS
> + fill_sig_info_pkey(code, &info, addr);
> +#endif /* CONFIG_PPC64_MEMORY_PROTECTION_KEYS */
> +
> force_sig_info(signr, &info, current);
> }

Eric

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