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Thread-Topic: [PATCH v2] x86/fault: Send a SIGBUS to user process always for hwpoison page access. 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charset="iso-2022-jp" Content-ID: <5290B686DEA80A40B885E2B307137BFE@jpnprd01.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nec.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: TY1PR01MB1852.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7408a35a-b6ee-4551-af41-08d8c8de1dbf X-MS-Exchange-CrossTenant-originalarrivaltime: 04 Feb 2021 07:25:57.8702 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: e67df547-9d0d-4f4d-9161-51c6ed1f7d11 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 7qZlC2HaA1iYnwJUU+j64eJbTuvN56/hejJeCxkkk/sD0e5A110eKBoPGV4sqfCdwM3NvqyfwTN+EWoAGXuLfw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYBPR01MB5344 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: Hi Aili, On Mon, Feb 01, 2021 at 04:17:49PM +0800, Aili Yao wrote: > When one page is already hwpoisoned by AO action, process may not be > killed, the process mapping this page may make a syscall include this > page and result to trigger a VM_FAULT_HWPOISON fault, if it's in kernel > mode it may be fixed by fixup_exception. Current code will just return > error code to user process. >=20 > This is not sufficient, we should send a SIGBUS to the process and log > the info to console, as we can't trust the process will handle the error > correctly. >=20 > Suggested-by: Feng Yang > Signed-off-by: Aili Yao > --- ... > @@ -662,12 +662,32 @@ no_context(struct pt_regs *regs, unsigned long erro= r_code, > * In this case we need to make sure we're not recursively > * faulting through the emulate_vsyscall() logic. > */ > + > + if (IS_ENABLED(CONFIG_MEMORY_FAILURE) && > + fault & (VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE)) { > + unsigned int lsb =3D 0; > + > + pr_err("MCE: Killing %s:%d due to hardware memory corruption fault at= %lx\n", > + current->comm, current->pid, address); > + > + sanitize_error_code(address, &error_code); > + set_signal_archinfo(address, error_code); > + > + if (fault & VM_FAULT_HWPOISON_LARGE) > + lsb =3D hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault)); > + if (fault & VM_FAULT_HWPOISON) > + lsb =3D PAGE_SHIFT; > + > + force_sig_mceerr(BUS_MCEERR_AR, (void __user *)address, lsb); This part contains some duplicated code with do_sigbus(), so some refactori= ng (like adding a common function) would be more helpful. Thanks, Naoya Horiguchi=