From patchwork Tue Dec 21 13:50:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Ellerman X-Patchwork-Id: 1571671 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=by7iycom; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4JJHvr4KY7z9s3q for ; Wed, 22 Dec 2021 00:52:40 +1100 (AEDT) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4JJHvr3Hppz3cSN for ; Wed, 22 Dec 2021 00:52:40 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=by7iycom; dkim-atps=neutral X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from gandalf.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4JJHtF1x1Jz2y7Q for ; Wed, 22 Dec 2021 00:51:17 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=by7iycom; dkim-atps=neutral Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 4JJHtC2bpPz4xbd; Wed, 22 Dec 2021 00:51:15 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ellerman.id.au; s=201909; t=1640094675; bh=VkegTdsz50hBFtARFdPFEYLF5Ii3nTvOaWgksXVdTG8=; h=From:To:Cc:Subject:Date:From; b=by7iycomqZv0o3L5DgjtnRHyEsPLAM9Mas4P66EKN6WarpI+VBW+EIlGYJUgYG/iW Kj/oA9zxhbCL89ZIYK1I/qeI3xKErrSAFZy0rf6EUrm6rB6vSj/BGXyYnzRlCCWSxJ 086IgR0hqAXEE8GGPT9htqDiZClfxknQPCtJBfNbBT8EuEAHK5tspvGxA982wl2JBq 6qJJy7sljeiUaGYvBYiPFmWDZRYoEAqP5pXftiEbguKxAaDXNyg3f/VSJaRGP6gsp2 vlTRtGl2UpXUdpClEPQvm9S/AOB1FmQFdekfBjRPj9SBIBEMfvb8+frj223u1W6Gd1 PSUAbylYAVF/g== From: Michael Ellerman To: Subject: [PATCH 1/3] powerpc/64s: Mask NIP before checking against SRR0 Date: Wed, 22 Dec 2021 00:50:59 +1100 Message-Id: <20211221135101.2085547-1-mpe@ellerman.id.au> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: sachinp@linux.ibm.com, npiggin@gmail.com Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" When CONFIG_PPC_RFI_SRR_DEBUG=y we check that NIP and SRR0 match when returning from interrupts. This can trigger falsely if NIP has either of its two low bits set via sigreturn or ptrace, while SRR0 has its low two bits masked in hardware. As a quick fix make sure to mask the low bits before doing the check. Fixes: 59dc5bfca0cb ("powerpc/64s: avoid reloading (H)SRR registers if they are still valid") Reported-by: Sachin Sant Signed-off-by: Michael Ellerman Tested-by: Sachin Sant --- arch/powerpc/kernel/interrupt_64.S | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S index 2ad223597ca2..4fd65d39d5d3 100644 --- a/arch/powerpc/kernel/interrupt_64.S +++ b/arch/powerpc/kernel/interrupt_64.S @@ -30,6 +30,7 @@ .ifc \srr,srr mfspr r11,SPRN_SRR0 ld r12,_NIP(r1) + clrrdi r12,r12,2 100: tdne r11,r12 EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) mfspr r11,SPRN_SRR1 @@ -39,6 +40,7 @@ .else mfspr r11,SPRN_HSRR0 ld r12,_NIP(r1) + clrrdi r12,r12,2 100: tdne r11,r12 EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) mfspr r11,SPRN_HSRR1 From patchwork Tue Dec 21 13:51:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Ellerman X-Patchwork-Id: 1571670 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=N1FiICVc; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4JJHv849h0z9s3q for ; Wed, 22 Dec 2021 00:52:04 +1100 (AEDT) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4JJHv83Jl4z2ypV for ; Wed, 22 Dec 2021 00:52:04 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=N1FiICVc; dkim-atps=neutral X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from gandalf.ozlabs.org (gandalf.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee2:21ea]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4JJHtD4nWKz2y7Q for ; Wed, 22 Dec 2021 00:51:16 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=N1FiICVc; dkim-atps=neutral Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 4JJHtC6LY0z4xmt; Wed, 22 Dec 2021 00:51:15 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ellerman.id.au; s=201909; t=1640094675; bh=KGm9yAdRziTc3fhSEw2QONkq+jyW00Ryj2RH7aVCgt4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=N1FiICVccunsR8GIxWDcdfNVFtmZzNOcDr+WFUfqY68ksPhYuFex4SHFhvobweyGZ ofVahvKp4TQrOz9Tt0Klo7d3YSM6lTjN6ElxOlzQc6L9atUzeGP9UteXHePZ78/AYI zyJatK61VY5BX//zU6qGKz2IVNxKFCBp24e3MJaZWGY3BqjOj8NsRRImOIG3cXvplf JXyssJFNJdCAlbeujTbwqBw1NDLgjxqusY8b+6njSkgAzl9S2O26ElNwgfsoQKVWZM z4E60GWT7qljDqwfwdflZkVWIvjQin3f/nDB/ShhB/U2/O4TngphjAybRaqY1tKnxG n3H0NFiiN4tCQ== From: Michael Ellerman To: Subject: [PATCH 2/3] powerpc/64s: Use EMIT_WARN_ENTRY for SRR debug warnings Date: Wed, 22 Dec 2021 00:51:00 +1100 Message-Id: <20211221135101.2085547-2-mpe@ellerman.id.au> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211221135101.2085547-1-mpe@ellerman.id.au> References: <20211221135101.2085547-1-mpe@ellerman.id.au> MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: sachinp@linux.ibm.com, npiggin@gmail.com Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" When CONFIG_PPC_RFI_SRR_DEBUG=y we check the SRR values before returning from interrupts. This is done in asm using EMIT_BUG_ENTRY, and passing BUGFLAG_WARNING. However that fails to create an exception table entry for the warning, and so do_program_check() fails the exception table search and proceeds to call _exception(), resulting in an oops like: Oops: Exception in kernel mode, sig: 5 [#1] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries Modules linked in: CPU: 2 PID: 1204 Comm: sigreturn_unali Tainted: P 5.16.0-rc2-00194-g91ca3d4f77c5 #12 NIP: c00000000000c5b0 LR: 0000000000000000 CTR: 0000000000000000 ... NIP [c00000000000c5b0] system_call_common+0x150/0x268 LR [0000000000000000] 0x0 Call Trace: [c00000000db73e10] [c00000000000c558] system_call_common+0xf8/0x268 (unreliable) ... Instruction dump: 7cc803a6 888d0931 2c240000 4082001c 38800000 988d0931 e8810170 e8a10178 7c9a03a6 7cbb03a6 7d7a02a6 e9810170 <7f0b6088> 7d7b02a6 e9810178 7f0b6088 We should instead use EMIT_WARN_ENTRY, which creates an exception table entry for the warning, allowing the warning to be correctly recognised, and the code to resume after printing the warning. Note however that because this warning is buried deep in the interrupt return path, we are not able to recover from it (due to MSR_RI being clear), so we still end up in die() with an unrecoverable exception. Fixes: 59dc5bfca0cb ("powerpc/64s: avoid reloading (H)SRR registers if they are still valid") Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/interrupt_64.S | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S index 4fd65d39d5d3..be5ff1521505 100644 --- a/arch/powerpc/kernel/interrupt_64.S +++ b/arch/powerpc/kernel/interrupt_64.S @@ -32,21 +32,21 @@ ld r12,_NIP(r1) clrrdi r12,r12,2 100: tdne r11,r12 - EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) mfspr r11,SPRN_SRR1 ld r12,_MSR(r1) 100: tdne r11,r12 - EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) .else mfspr r11,SPRN_HSRR0 ld r12,_NIP(r1) clrrdi r12,r12,2 100: tdne r11,r12 - EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) mfspr r11,SPRN_HSRR1 ld r12,_MSR(r1) 100: tdne r11,r12 - EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) .endif #endif .endm From patchwork Tue Dec 21 13:51:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Ellerman X-Patchwork-Id: 1571669 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=J5pG9+BJ; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4JJHtW5b7Vz9s3q for ; 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dkim-atps=neutral Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 4JJHtD2hC2z4xmw; Wed, 22 Dec 2021 00:51:16 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ellerman.id.au; s=201909; t=1640094676; bh=ezPXUv5+nw6NHWDgONhT6tdR1kAn7ZIOV6VY52Fxh/U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=J5pG9+BJvbAtezLFXIvhkBBXcZZV26AWYzrAMMjtcs8luNXlYU0kZbbyVkqULDola nGD/57Pj+HbhnWuD5rcN9Qq2x84BCyCI0TsayULQ47w8ghhumoHcskvFGX92jntPg2 q3J5I1YwnjJhLt4klGKEor9IprcC5e5avHbzhxa+5V79lCRoADa1QytGRaZkkPR5L3 +UINtH5j3Sij5nuie3Dtzpw2aQx7Ns3/7jxdwoRZfgmSNX7nEiZ4ixCwJF8W7LUVEX 4NWnJEbsOn9PHa+4qWOBs7N4XcFOdcPVLpCxq+0m+rQjED8vEpRDTbS4xnx65FcvuJ 5dQK6wThSzDlw== From: Michael Ellerman To: Subject: [PATCH 3/3] selftests/powerpc: Add a test of sigreturning to an unaligned address Date: Wed, 22 Dec 2021 00:51:01 +1100 Message-Id: <20211221135101.2085547-3-mpe@ellerman.id.au> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211221135101.2085547-1-mpe@ellerman.id.au> References: <20211221135101.2085547-1-mpe@ellerman.id.au> MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: sachinp@linux.ibm.com, npiggin@gmail.com Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Add a test of sigreturning to an unaligned address (low two bits set). This should have no effect because the hardware will mask those bits. However it previously falsely triggered a warning when CONFIG_PPC_RFI_SRR_DEBUG=y. Signed-off-by: Michael Ellerman --- .../selftests/powerpc/signal/.gitignore | 1 + .../testing/selftests/powerpc/signal/Makefile | 1 + .../powerpc/signal/sigreturn_unaligned.c | 43 +++++++++++++++++++ 3 files changed, 45 insertions(+) create mode 100644 tools/testing/selftests/powerpc/signal/sigreturn_unaligned.c diff --git a/tools/testing/selftests/powerpc/signal/.gitignore b/tools/testing/selftests/powerpc/signal/.gitignore index 8f6c816099a4..9d0915777fed 100644 --- a/tools/testing/selftests/powerpc/signal/.gitignore +++ b/tools/testing/selftests/powerpc/signal/.gitignore @@ -5,3 +5,4 @@ sigfuz sigreturn_vdso sig_sc_double_restart sigreturn_kernel +sigreturn_unaligned diff --git a/tools/testing/selftests/powerpc/signal/Makefile b/tools/testing/selftests/powerpc/signal/Makefile index 84e201572466..f679d260afc8 100644 --- a/tools/testing/selftests/powerpc/signal/Makefile +++ b/tools/testing/selftests/powerpc/signal/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 TEST_GEN_PROGS := signal signal_tm sigfuz sigreturn_vdso sig_sc_double_restart TEST_GEN_PROGS += sigreturn_kernel +TEST_GEN_PROGS += sigreturn_unaligned CFLAGS += -maltivec $(OUTPUT)/signal_tm: CFLAGS += -mhtm diff --git a/tools/testing/selftests/powerpc/signal/sigreturn_unaligned.c b/tools/testing/selftests/powerpc/signal/sigreturn_unaligned.c new file mode 100644 index 000000000000..6e58ee4f0fdf --- /dev/null +++ b/tools/testing/selftests/powerpc/signal/sigreturn_unaligned.c @@ -0,0 +1,43 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test sigreturn to an unaligned address, ie. low 2 bits set. + * Nothing bad should happen. + * This was able to trigger warnings with CONFIG_PPC_RFI_SRR_DEBUG=y. + */ + +#include +#include +#include +#include +#include +#include + +#include "utils.h" + + +static void sigusr1_handler(int signo, siginfo_t *info, void *ptr) +{ + ucontext_t *uc = ptr; + + UCONTEXT_NIA(uc) |= 3; +} + +static int test_sigreturn_unaligned(void) +{ + struct sigaction action; + + memset(&action, 0, sizeof(action)); + action.sa_sigaction = sigusr1_handler; + action.sa_flags = SA_SIGINFO; + + FAIL_IF(sigaction(SIGUSR1, &action, NULL) == -1); + + raise(SIGUSR1); + + return 0; +} + +int main(void) +{ + return test_harness(test_sigreturn_unaligned, "sigreturn_unaligned"); +}