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Mon, 15 Jun 2026 05:21:50 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (smtpav02.fra02v.mail.ibm.com [10.20.54.101]) by smtprelay05.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 65F5Lkh850266394 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 15 Jun 2026 05:21:46 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6D7BF2004E; Mon, 15 Jun 2026 05:21:46 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2DDBB20040; Mon, 15 Jun 2026 05:21:44 +0000 (GMT) Received: from [9.123.5.233] (unknown [9.123.5.233]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 15 Jun 2026 05:21:43 +0000 (GMT) Message-ID: Date: Mon, 15 Jun 2026 10:51:43 +0530 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] powerpc: Restore kuap regs during syscall restart exit To: "Mukesh Kumar Chaurasiya (IBM)" Cc: Sayali Patil , maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, mkchauras@linux.ibm.com, ruanjinjie@huawei.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org References: <20260613123831.1510474-1-mkchauras@gmail.com> Content-Language: en-US From: Shrikanth Hegde In-Reply-To: <20260613123831.1510474-1-mkchauras@gmail.com> Content-Type: text/plain; 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On 6/13/26 6:08 PM, Mukesh Kumar Chaurasiya (IBM) wrote: > During syscall restart, we block the kuap as we need to replay > interrupts. Which are not restored when we exit to the user, hence we > get a fault which ends up with `bad_access_pkey` and hence crashing the > kernel. > > We have already stored the kuap values during the entry, just restore > them when we exit. > > Applies on linux-next (next-20260610). > Please re-write the changelog in imperative mood. i.e Avoid we/you/I. https://www.kernel.org/doc/html/v4.17/process/submitting-patches.html#describe-your-changes > Fixes: bee25f97ad24 ("powerpc: Enable GENERIC_ENTRY feature") > Reported-by: Sayali Patil > Signed-off-by: Mukesh Kumar Chaurasiya (IBM) > --- > arch/powerpc/kernel/interrupt.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c > index 89a999be1352..159901d6ba8c 100644 > --- a/arch/powerpc/kernel/interrupt.c > +++ b/arch/powerpc/kernel/interrupt.c > @@ -165,7 +165,7 @@ notrace unsigned long syscall_exit_restart(unsigned long r3, struct pt_regs *reg > local_irq_disable(); > goto again; > } > - > + kuap_user_restore(regs); Please describe where was kuap save was done in the stack. > regs->exit_result |= regs->exit_flags; > > return regs->exit_result;