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Fri, 13 Nov 2020 09:53:00 -0800 (PST) Date: Fri, 13 Nov 2020 18:52:54 +0100 From: Marco Elver To: Andrey Konovalov Cc: Dmitry Vyukov , Alexander Potapenko , Catalin Marinas , Will Deacon , Vincenzo Frascino , Evgenii Stepanov , Andrey Ryabinin , Branislav Rankov , Kevin Brodsky , Andrew Morton , kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 11/20] kasan: add and integrate kasan boot parameters Message-ID: <20201113175254.GA3175464@elver.google.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.14.6 (2020-07-11) 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: On Tue, Nov 10, 2020 at 11:20PM +0100, 'Andrey Konovalov' via kasan-dev wrote: [...] > +/* kasan.mode=off/prod/full */ > +static int __init early_kasan_mode(char *arg) > +{ > + if (!arg) > + return -EINVAL; > + > + if (!strcmp(arg, "off")) > + kasan_arg_mode = KASAN_ARG_MODE_OFF; > + else if (!strcmp(arg, "prod")) > + kasan_arg_mode = KASAN_ARG_MODE_PROD; > + else if (!strcmp(arg, "full")) > + kasan_arg_mode = KASAN_ARG_MODE_FULL; > + else > + return -EINVAL; > + > + return 0; > +} > +early_param("kasan.mode", early_kasan_mode); > + > +/* kasan.stack=off/on */ > +static int __init early_kasan_flag_stacktrace(char *arg) > +{ > + if (!arg) > + return -EINVAL; > + > + if (!strcmp(arg, "off")) > + kasan_arg_stacktrace = KASAN_ARG_STACKTRACE_OFF; > + else if (!strcmp(arg, "on")) > + kasan_arg_stacktrace = KASAN_ARG_STACKTRACE_ON; > + else > + return -EINVAL; > + > + return 0; > +} > +early_param("kasan.stacktrace", early_kasan_flag_stacktrace); > + > +/* kasan.fault=report/panic */ > +static int __init early_kasan_fault(char *arg) > +{ > + if (!arg) > + return -EINVAL; > + > + if (!strcmp(arg, "report")) > + kasan_arg_fault = KASAN_ARG_FAULT_REPORT; > + else if (!strcmp(arg, "panic")) > + kasan_arg_fault = KASAN_ARG_FAULT_PANIC; > + else > + return -EINVAL; > + > + return 0; > +} [...] The above could be simplified, see suggestion below. Thanks, -- Marco ------ >8 ------ diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c index c91f2c06ecb5..71fc481ad21d 100644 --- a/mm/kasan/hw_tags.c +++ b/mm/kasan/hw_tags.c @@ -64,10 +64,8 @@ static int __init early_kasan_mode(char *arg) kasan_arg_mode = KASAN_ARG_MODE_PROD; else if (!strcmp(arg, "full")) kasan_arg_mode = KASAN_ARG_MODE_FULL; - else - return -EINVAL; - return 0; + return -EINVAL; } early_param("kasan.mode", early_kasan_mode); @@ -81,10 +79,8 @@ static int __init early_kasan_flag_stacktrace(char *arg) kasan_arg_stacktrace = KASAN_ARG_STACKTRACE_OFF; else if (!strcmp(arg, "on")) kasan_arg_stacktrace = KASAN_ARG_STACKTRACE_ON; - else - return -EINVAL; - return 0; + return -EINVAL; } early_param("kasan.stacktrace", early_kasan_flag_stacktrace); @@ -98,10 +94,8 @@ static int __init early_kasan_fault(char *arg) kasan_arg_fault = KASAN_ARG_FAULT_REPORT; else if (!strcmp(arg, "panic")) kasan_arg_fault = KASAN_ARG_FAULT_PANIC; - else - return -EINVAL; - return 0; + return -EINVAL; } early_param("kasan.fault", early_kasan_fault);