From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7B893C433B4 for ; Fri, 30 Apr 2021 23:20:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5262161409 for ; Fri, 30 Apr 2021 23:20:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232778AbhD3XVC (ORCPT ); Fri, 30 Apr 2021 19:21:02 -0400 Received: from out03.mta.xmission.com ([166.70.13.233]:33508 "EHLO out03.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231462AbhD3XU6 (ORCPT ); Fri, 30 Apr 2021 19:20:58 -0400 Received: from in02.mta.xmission.com ([166.70.13.52]) by out03.mta.xmission.com with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1lccQV-004DLh-Rr; Fri, 30 Apr 2021 17:20:04 -0600 Received: from ip68-227-160-95.om.om.cox.net ([68.227.160.95] helo=fess.xmission.com) by in02.mta.xmission.com with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1lccQU-007HCH-J2; Fri, 30 Apr 2021 17:20:03 -0600 From: ebiederm@xmission.com (Eric W. Biederman) To: Marco Elver Cc: Arnd Bergmann , Florian Weimer , "David S. Miller" , Peter Zijlstra , Ingo Molnar , Thomas Gleixner , Peter Collingbourne , Dmitry Vyukov , Alexander Potapenko , sparclinux , linux-arch , Linux Kernel Mailing List , Linux API , kasan-dev References: Date: Fri, 30 Apr 2021 18:19:58 -0500 In-Reply-To: (Eric W. Biederman's message of "Fri, 30 Apr 2021 17:54:16 -0500") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-XM-SPF: eid=1lccQU-007HCH-J2;;;mid=;;;hst=in02.mta.xmission.com;;;ip=68.227.160.95;;;frm=ebiederm@xmission.com;;;spf=neutral X-XM-AID: U2FsdGVkX18OuzsZtpaVFuh5x4vTdt9uc78OYUZkyKE= X-SA-Exim-Connect-IP: 68.227.160.95 X-SA-Exim-Mail-From: ebiederm@xmission.com Subject: Re: [PATCH 2/3] signal: Implement SIL_FAULT_TRAPNO X-SA-Exim-Version: 4.2.1 (built Sat, 08 Feb 2020 21:53:50 +0000) X-SA-Exim-Scanned: Yes (on in02.mta.xmission.com) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ebiederm@xmission.com (Eric W. Biederman) writes: > Now that si_trapno is part of the union in _si_fault and available on > all architectures, add SIL_FAULT_TRAPNO and update siginfo_layout to > return SIL_FAULT_TRAPNO when si_trapno is actually used. > > Update the code that uses siginfo_layout to deal with SIL_FAULT_TRAPNO > and have the same code ignore si_trapno in in all other cases. This change is missing a break in signalfd. Eric > Signed-off-by: "Eric W. Biederman" > --- > fs/signalfd.c | 7 ++----- > include/linux/signal.h | 1 + > kernel/signal.c | 36 ++++++++++++++---------------------- > 3 files changed, 17 insertions(+), 27 deletions(-) > > diff --git a/fs/signalfd.c b/fs/signalfd.c > index 040a1142915f..126c681a30e7 100644 > --- a/fs/signalfd.c > +++ b/fs/signalfd.c > @@ -123,15 +123,12 @@ static int signalfd_copyinfo(struct signalfd_siginfo __user *uinfo, > */ > case SIL_FAULT: > new.ssi_addr = (long) kinfo->si_addr; + break; > -#ifdef __ARCH_SI_TRAPNO > + case SIL_FAULT_TRAPNO: > + new.ssi_addr = (long) kinfo->si_addr; > new.ssi_trapno = kinfo->si_trapno; > -#endif > break; > case SIL_FAULT_MCEERR: > new.ssi_addr = (long) kinfo->si_addr; > -#ifdef __ARCH_SI_TRAPNO > - new.ssi_trapno = kinfo->si_trapno; > -#endif > new.ssi_addr_lsb = (short) kinfo->si_addr_lsb; > break; > case SIL_PERF_EVENT: > diff --git a/include/linux/signal.h b/include/linux/signal.h > index 1e98548d7cf6..5160fd45e5ca 100644 > --- a/include/linux/signal.h > +++ b/include/linux/signal.h > @@ -40,6 +40,7 @@ enum siginfo_layout { > SIL_TIMER, > SIL_POLL, > SIL_FAULT, > + SIL_FAULT_TRAPNO, > SIL_FAULT_MCEERR, > SIL_FAULT_BNDERR, > SIL_FAULT_PKUERR, > diff --git a/kernel/signal.c b/kernel/signal.c > index c3017aa8024a..7b2d61cb7411 100644 > --- a/kernel/signal.c > +++ b/kernel/signal.c > @@ -1194,6 +1194,7 @@ static inline bool has_si_pid_and_uid(struct kernel_siginfo *info) > case SIL_TIMER: > case SIL_POLL: > case SIL_FAULT: > + case SIL_FAULT_TRAPNO: > case SIL_FAULT_MCEERR: > case SIL_FAULT_BNDERR: > case SIL_FAULT_PKUERR: > @@ -2527,6 +2528,7 @@ static void hide_si_addr_tag_bits(struct ksignal *ksig) > { > switch (siginfo_layout(ksig->sig, ksig->info.si_code)) { > case SIL_FAULT: > + case SIL_FAULT_TRAPNO: > case SIL_FAULT_MCEERR: > case SIL_FAULT_BNDERR: > case SIL_FAULT_PKUERR: > @@ -3206,6 +3208,12 @@ enum siginfo_layout siginfo_layout(unsigned sig, int si_code) > if ((sig == SIGBUS) && > (si_code >= BUS_MCEERR_AR) && (si_code <= BUS_MCEERR_AO)) > layout = SIL_FAULT_MCEERR; > + else if (IS_ENABLED(ALPHA) && > + ((sig == SIGFPE) || > + ((sig == SIGTRAP) && (si_code == TRAP_UNK)))) > + layout = SIL_FAULT_TRAPNO; > + else if (IS_ENABLED(SPARC) && (sig == SIGILL) && (si_code == ILL_ILLTRP)) > + layout = SIL_FAULT_TRAPNO; > else if ((sig == SIGSEGV) && (si_code == SEGV_BNDERR)) > layout = SIL_FAULT_BNDERR; > #ifdef SEGV_PKUERR > @@ -3317,30 +3325,22 @@ void copy_siginfo_to_external32(struct compat_siginfo *to, > break; > case SIL_FAULT: > to->si_addr = ptr_to_compat(from->si_addr); > -#ifdef __ARCH_SI_TRAPNO > + break; > + case SIL_FAULT_TRAPNO: > + to->si_addr = ptr_to_compat(from->si_addr); > to->si_trapno = from->si_trapno; > -#endif > break; > case SIL_FAULT_MCEERR: > to->si_addr = ptr_to_compat(from->si_addr); > -#ifdef __ARCH_SI_TRAPNO > - to->si_trapno = from->si_trapno; > -#endif > to->si_addr_lsb = from->si_addr_lsb; > break; > case SIL_FAULT_BNDERR: > to->si_addr = ptr_to_compat(from->si_addr); > -#ifdef __ARCH_SI_TRAPNO > - to->si_trapno = from->si_trapno; > -#endif > to->si_lower = ptr_to_compat(from->si_lower); > to->si_upper = ptr_to_compat(from->si_upper); > break; > case SIL_FAULT_PKUERR: > to->si_addr = ptr_to_compat(from->si_addr); > -#ifdef __ARCH_SI_TRAPNO > - to->si_trapno = from->si_trapno; > -#endif > to->si_pkey = from->si_pkey; > break; > case SIL_PERF_EVENT: > @@ -3401,30 +3401,22 @@ static int post_copy_siginfo_from_user32(kernel_siginfo_t *to, > break; > case SIL_FAULT: > to->si_addr = compat_ptr(from->si_addr); > -#ifdef __ARCH_SI_TRAPNO > + break; > + case SIL_FAULT_TRAPNO: > + to->si_addr = compat_ptr(from->si_addr); > to->si_trapno = from->si_trapno; > -#endif > break; > case SIL_FAULT_MCEERR: > to->si_addr = compat_ptr(from->si_addr); > -#ifdef __ARCH_SI_TRAPNO > - to->si_trapno = from->si_trapno; > -#endif > to->si_addr_lsb = from->si_addr_lsb; > break; > case SIL_FAULT_BNDERR: > to->si_addr = compat_ptr(from->si_addr); > -#ifdef __ARCH_SI_TRAPNO > - to->si_trapno = from->si_trapno; > -#endif > to->si_lower = compat_ptr(from->si_lower); > to->si_upper = compat_ptr(from->si_upper); > break; > case SIL_FAULT_PKUERR: > to->si_addr = compat_ptr(from->si_addr); > -#ifdef __ARCH_SI_TRAPNO > - to->si_trapno = from->si_trapno; > -#endif > to->si_pkey = from->si_pkey; > break; > case SIL_PERF_EVENT: