From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-3.1 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 7483 invoked from network); 2 Jun 2021 11:48:08 -0000 Received: from mother.openwall.net (195.42.179.200) by inbox.vuxu.org with ESMTPUTF8; 2 Jun 2021 11:48:08 -0000 Received: (qmail 18187 invoked by uid 550); 2 Jun 2021 11:48:06 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Reply-To: musl@lists.openwall.com Received: (qmail 18151 invoked from network); 2 Jun 2021 11:48:05 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1622634472; bh=q8gKn2Z957mx4u3uYf4BEGqmCtIdVS+1rgXR+HW02+c=; h=From:To:Cc:Subject:Date:From; b=jyWVxr0z3mXs5pGRAbLsxSRMBsJ9WHdnS5bXy+rf+7X/SvrELYFkRjXoGBJblpZ9o lCbcLbGQ30lccIFlv6GtSYacn8ChFHznCmvFYZp+gzT+60qaivaeHvfi4q8S2rUmlL TYSCSXnwatjerVOMOrnDaaj5h2N6tvDWXHMLD1r0cvpMjb2GbeUXpU0tmJsVhYrjQF mNYtflcBMNXNpm27oNMpyRihtXmJ3t+L6Cl2kkQUN80gHzfgtTgJvUn+4Rfd5i18H1 6tPoBxTBZkNBoruFk9DNzsKGGoctDua/e2kROyOl4yqWy3PZbBrkBBsdw2Y5XArUoU iv7Vx5/w3Uqrw== From: Arnd Bergmann To: stable@vger.kernel.org Cc: Michael Weiser , Martin Vajnar , musl@lists.openwall.com, Will Deacon , Greg Kroah-Hartman , Arnd Bergmann Date: Wed, 2 Jun 2021 13:46:17 +0200 Message-Id: <20210602114617.423521-1-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [musl] [PATCH] [stable v4.1] arm64: Remove unimplemented syscall log message From: Michael Weiser commit 1962682d2b2fbe6cfa995a85c53c069fadda473e upstream. Stop printing a (ratelimited) kernel message for each instance of an unimplemented syscall being called. Userland making an unimplemented syscall is not necessarily misbehaviour and to be expected with a current userland running on an older kernel. Also, the current message looks scary to users but does not actually indicate a real problem nor help them narrow down the cause. Just rely on sys_ni_syscall() to return -ENOSYS. Cc: Cc: Martin Vajnar Cc: musl@lists.openwall.com Acked-by: Will Deacon Signed-off-by: Michael Weiser Signed-off-by: Will Deacon Signed-off-by: Greg Kroah-Hartman Signed-off-by: Arnd Bergmann --- This was backported to v4.14 and later, but is missing in v4.4 and before, apparently because of a trivial merge conflict. This is a manual backport I did after I saw a report about the issue by Martin Vajnar on the musl mailing list. Signed-off-by: Arnd Bergmann --- arch/arm64/kernel/traps.c | 8 -------- 1 file changed, 8 deletions(-) diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index 9322be69ca09..db4163808c76 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -363,14 +363,6 @@ asmlinkage long do_ni_syscall(struct pt_regs *regs) } #endif - if (show_unhandled_signals && printk_ratelimit()) { - pr_info("%s[%d]: syscall %d\n", current->comm, - task_pid_nr(current), (int)regs->syscallno); - dump_instr("", regs); - if (user_mode(regs)) - __show_regs(regs); - } - return sys_ni_syscall(); } -- 2.29.2