From: Madhavan Srinivasan <maddy@linux.ibm.com>
To: mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org,
sshegde@linux.ibm.com, ruanjinjie@huawei.com,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
"Mukesh Kumar Chaurasiya (IBM)" <mkchauras@gmail.com>
Cc: Sayali Patil <sayalip@linux.ibm.com>
Subject: Re: [PATCH V2] powerpc: Restore KUAP registers on syscall restart exit
Date: Sat, 20 Jun 2026 03:29:32 +0530 [thread overview]
Message-ID: <178190618810.653308.8397573315437375026.b4-ty@linux.ibm.com> (raw)
In-Reply-To: <20260615162617.2861795-1-mkchauras@gmail.com>
On Mon, 15 Jun 2026 21:56:17 +0530, Mukesh Kumar Chaurasiya (IBM) wrote:
> During a syscall restart, block KUAP so that pending interrupts can be
> replayed. The original KUAP state is not restored before returning to
> userspace, causing subsequent userspace accesses to fault and eventually
> trigger bad_access_pkey(), crashing the kernel.
>
> The original KUAP register values are already saved in
> arch_enter_from_user_mode(). Restore them on the syscall restart exit
> path before returning to userspace.
>
> [...]
Applied to powerpc/next.
[1/1] powerpc: Restore KUAP registers on syscall restart exit
https://git.kernel.org/powerpc/c/4e1187e12de40b5301977b2476d21b569358dafb
cheers
prev parent reply other threads:[~2026-06-19 22:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-15 16:26 Mukesh Kumar Chaurasiya (IBM)
2026-06-16 6:44 ` Sayali Patil
2026-06-19 21:59 ` Madhavan Srinivasan [this message]
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