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s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=Y00REmw7cW2Ho0KOM1NABcGJpQIr8u0gXHD6A1O7ZXc=; b=rz4LjIT4e4s0u2RcXWS8/tOB2kn9dwF8vccW3UG2NBD33mcvAY4pIv8bVw+LHKOGfj k+zaf4vWe2yjJzUpVeljPYwRhrX7vbjAQKekm8vkMUPO4I603EqYFxqNnGUNl76QFXWL UkLNIeH+oi/uM85aWd76k31wcnv1r/D67b6n5ZkidBcuR1SfLQCsqoNe9XmePkcV0SZi WDOQg2QA7orpolPxmSJrchbCjxgEDly75eOfk5rdqUCAMnB+hv+9Qso1JC+ja3x8ity7 ieBj1z8fiKWJARRcFZ97aH0xQSJcw6WoV2vEZ+65cA9PzKbiMxhmhCUrAjiijmzhYhLM A3vA== X-Gm-Message-State: AOAM531mrpObhSFv+QfWDgn7Qxzp4MxKhzzII6bLDEaJI/d1C20PCP8P w75mATLTIs8TMNVS9hgK2m0htzmwT2cOIw== X-Google-Smtp-Source: ABdhPJxXjGFwD40kee1mNnaPkbYMTsK0NB+Nl4pE7YyjsA4sfahOk4MpuFQvMN8FFzVOGOoGSQTphyt0akERlg== X-Received: by 2002:a25:8411:: with SMTP id u17mr658207ybk.95.1596601799856; Tue, 04 Aug 2020 21:29:59 -0700 (PDT) Date: Tue, 4 Aug 2020 21:29:38 -0700 In-Reply-To: <20200805042938.2961494-1-davidgow@google.com> Message-Id: <20200805042938.2961494-7-davidgow@google.com> Mime-Version: 1.0 References: <20200805042938.2961494-1-davidgow@google.com> X-Mailer: git-send-email 2.28.0.163.g6104cc2f0b6-goog Subject: [PATCH v11 6/6] mm: kasan: Do not panic if both panic_on_warn and kasan_multishot set From: David Gow To: trishalfonso@google.com, brendanhiggins@google.com, aryabinin@virtuozzo.com, dvyukov@google.com, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, andreyknvl@google.com, shuah@kernel.org, akpm@linux-foundation.org Cc: David Gow , linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, kunit-dev@googlegroups.com, linux-kselftest@vger.kernel.org, linux-mm@kvack.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: E0A4B18229835 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 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: KASAN errors will currently trigger a panic when panic_on_warn is set. This renders kasan_multishot useless, as further KASAN errors won't be reported if the kernel has already paniced. By making kasan_multishot disable this behaviour for KASAN errors, we can still have the benefits of panic_on_warn for non-KASAN warnings, yet be able to use kasan_multishot. This is particularly important when running KASAN tests, which need to trigger multiple KASAN errors: previously these would panic the system if panic_on_warn was set, now they can run (and will panic the system should non-KASAN warnings show up). Signed-off-by: David Gow Reviewed-by: Andrey Konovalov Reviewed-by: Brendan Higgins --- mm/kasan/report.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/kasan/report.c b/mm/kasan/report.c index e2c14b10bc81..00a53f1355ae 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -95,7 +95,7 @@ static void end_report(unsigned long *flags) pr_err("==================================================================\n"); add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); spin_unlock_irqrestore(&report_lock, *flags); - if (panic_on_warn) { + if (panic_on_warn && !test_bit(KASAN_BIT_MULTI_SHOT, &kasan_flags)) { /* * This thread may hit another WARN() in the panic path. * Resetting this prevents additional WARN() from panicking the -- 2.28.0.163.g6104cc2f0b6-goog