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Tue, 16 Jun 2026 06:44:11 +0000 (GMT) Received: from smtpav01.wdc07v.mail.ibm.com (smtpav01.wdc07v.mail.ibm.com [10.39.53.228]) by smtprelay03.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 65G6hcSw22807220 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 16 Jun 2026 06:43:38 GMT Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 891DF5804B; Tue, 16 Jun 2026 06:44:09 +0000 (GMT) Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 195CC58063; Tue, 16 Jun 2026 06:44:06 +0000 (GMT) Received: from [9.124.214.164] (unknown [9.124.214.164]) by smtpav01.wdc07v.mail.ibm.com (Postfix) with ESMTP; Tue, 16 Jun 2026 06:44:05 +0000 (GMT) Message-ID: Date: Tue, 16 Jun 2026 12:14:04 +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 From: Sayali Patil Subject: Re: [PATCH V2] powerpc: Restore KUAP registers on syscall restart exit To: "Mukesh Kumar Chaurasiya (IBM)" , maddy@linux.ibm.com, 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 References: <20260615162617.2861795-1-mkchauras@gmail.com> Content-Language: en-IN In-Reply-To: <20260615162617.2861795-1-mkchauras@gmail.com> Content-Type: text/plain; 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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. > > Fixes: bee25f97ad24 ("powerpc: Enable GENERIC_ENTRY feature") > Reported-by: Sayali Patil > Signed-off-by: Mukesh Kumar Chaurasiya (IBM) > --- > V1 -> V2: > - Commit message rephrased > V1: https://lore.kernel.org/all/20260613123831.1510474-1-mkchauras@gmail.com > > arch/powerpc/kernel/interrupt.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c > index 89a999be1352..f04978080837 100644 > --- a/arch/powerpc/kernel/interrupt.c > +++ b/arch/powerpc/kernel/interrupt.c > @@ -166,6 +166,7 @@ notrace unsigned long syscall_exit_restart(unsigned long r3, struct pt_regs *reg > goto again; > } > > + kuap_user_restore(regs); > regs->exit_result |= regs->exit_flags; > > return regs->exit_result; This fixes the reported issue. Tested-by: Sayali Patil