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[46.139.12.213]) by smtp.gmail.com with ESMTPSA id n5sm4475408wmi.21.2019.06.29.12.45.37 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sat, 29 Jun 2019 12:45:37 -0700 (PDT) Date: Sat, 29 Jun 2019 21:45:35 +0200 From: Ingo Molnar To: Linus Torvalds Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , Peter Zijlstra , Borislav Petkov , Andrew Morton Subject: [GIT PULL] smp/urgent fixes Message-ID: <20190629194535.GA79708@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Linus, Please pull the latest smp-urgent-for-linus git tree from: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git smp-urgent-for-linus # HEAD: 33d4a5a7a5b4d02915d765064b2319e90a11cbde cpu/hotplug: Fix out-of-bounds read when setting fail state Two fixes: - Fix an out of bounds access when writing nonsensical values to /sys/devices/system/cpu/cpuX/hotplug/fail - Warn about unsupported mitigations= parameters. Thanks, Ingo ------------------> Eiichi Tsukata (1): cpu/hotplug: Fix out-of-bounds read when setting fail state Geert Uytterhoeven (1): cpu/speculation: Warn on unsupported mitigations= parameter kernel/cpu.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/cpu.c b/kernel/cpu.c index 077fde6fb953..ef1c565edc5d 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -1964,6 +1964,9 @@ static ssize_t write_cpuhp_fail(struct device *dev, if (ret) return ret; + if (fail < CPUHP_OFFLINE || fail > CPUHP_ONLINE) + return -EINVAL; + /* * Cannot fail STARTING/DYING callbacks. */ @@ -2339,6 +2342,9 @@ static int __init mitigations_parse_cmdline(char *arg) cpu_mitigations = CPU_MITIGATIONS_AUTO; else if (!strcmp(arg, "auto,nosmt")) cpu_mitigations = CPU_MITIGATIONS_AUTO_NOSMT; + else + pr_crit("Unsupported mitigations=%s, system may still be vulnerable\n", + arg); return 0; }