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Wed, 3 Feb 2021 13:45:02 +0100 (CET) Subject: Re: [PATCH v10 6/6] powerpc: Book3S 64-bit outline-only KASAN support To: Daniel Axtens , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, kasan-dev@googlegroups.com, aneesh.kumar@linux.ibm.com, bsingharora@gmail.com References: <20210203115946.663273-1-dja@axtens.net> <20210203115946.663273-7-dja@axtens.net> From: Christophe Leroy Message-ID: <4b790789-052f-76de-a289-726517026efd@csgroup.eu> Date: Wed, 3 Feb 2021 13:45:00 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: <20210203115946.663273-7-dja@axtens.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Le 03/02/2021 =C3=A0 12:59, Daniel Axtens a =C3=A9crit=C2=A0: > Implement a limited form of KASAN for Book3S 64-bit machines running un= der > the Radix MMU, supporting only outline mode. >=20 > diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/proces= s.c > index a66f435dabbf..9a6fd603f0e7 100644 > --- a/arch/powerpc/kernel/process.c > +++ b/arch/powerpc/kernel/process.c > @@ -2157,8 +2157,8 @@ void show_stack(struct task_struct *tsk, unsigned= long *stack, > break; > =20 > stack =3D (unsigned long *) sp; > - newsp =3D stack[0]; > - ip =3D stack[STACK_FRAME_LR_SAVE]; > + newsp =3D READ_ONCE_NOCHECK(stack[0]); > + ip =3D READ_ONCE_NOCHECK(stack[STACK_FRAME_LR_SAVE]); > if (!firstframe || ip !=3D lr) { > printk("%s["REG"] ["REG"] %pS", > loglvl, sp, ip, (void *)ip); > @@ -2176,17 +2176,19 @@ void show_stack(struct task_struct *tsk, unsign= ed long *stack, > * See if this is an exception frame. > * We look for the "regshere" marker in the current frame. > */ > - if (validate_sp(sp, tsk, STACK_INT_FRAME_SIZE) > - && stack[STACK_FRAME_MARKER] =3D=3D STACK_FRAME_REGS_MARKER) { > + if (validate_sp(sp, tsk, STACK_INT_FRAME_SIZE) && > + (READ_ONCE_NOCHECK(stack[STACK_FRAME_MARKER]) =3D=3D > + STACK_FRAME_REGS_MARKER)) { > struct pt_regs *regs =3D (struct pt_regs *) > (sp + STACK_FRAME_OVERHEAD); > =20 > - lr =3D regs->link; > + lr =3D READ_ONCE_NOCHECK(regs->link); > printk("%s--- interrupt: %lx at %pS\n", > - loglvl, regs->trap, (void *)regs->nip); > + loglvl, READ_ONCE_NOCHECK(regs->trap), > + (void *)READ_ONCE_NOCHECK(regs->nip)); > __show_regs(regs); > printk("%s--- interrupt: %lx\n", > - loglvl, regs->trap); > + loglvl, READ_ONCE_NOCHECK(regs->trap)); > =20 > firstframe =3D 1; > } The above changes look like a bug fix not directly related to KASAN. Shou= ld be split out in another=20 patch I think. Christophe