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Fri, 08 Dec 2023 06:18:52 -0800 (PST) MIME-Version: 1.0 References: <20231121220155.1217090-1-iii@linux.ibm.com> <20231121220155.1217090-27-iii@linux.ibm.com> In-Reply-To: <20231121220155.1217090-27-iii@linux.ibm.com> From: Alexander Potapenko Date: Fri, 8 Dec 2023 15:18:16 +0100 Message-ID: Subject: Re: [PATCH v2 26/33] s390/ftrace: Unpoison ftrace_regs in kprobe_ftrace_handler() To: Ilya Leoshkevich Cc: Alexander Gordeev , Andrew Morton , Christoph Lameter , David Rientjes , Heiko Carstens , Joonsoo Kim , Marco Elver , Masami Hiramatsu , Pekka Enberg , Steven Rostedt , Vasily Gorbik , Vlastimil Babka , Christian Borntraeger , Dmitry Vyukov , Hyeonggon Yoo <42.hyeyoo@gmail.com>, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Mark Rutland , Roman Gushchin , Sven Schnelle Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: E384CC001A X-Stat-Signature: 3zjnhnye9s14myt3grf1fdmujf3fz35t X-HE-Tag: 1702045133-615463 X-HE-Meta: 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 vD0dlVR7 jcX2NP9Ej09BQTTW/Lub+DcwBndC3Y7TOtkUpzAK847MlJIJ/OCj/hjtq36GsRiRNqxRJhXBgKZUv2Y6lEf26Ve3ujQ+g0ylDBAg4gygGe3OzfS9+wQDPG1VADQ0zha/oJK9x+pc2qq0Bimnxamk4yfzlGeQ3FyNxW4rMhZ/gm2qApIlKP8rmIist9Z5DFKKMv+cohoRs51j4q81CIf80COe9Vnv+M/2Rd5MthofxmR+/ImNiVlZbmrTsnyIcnBKQtNcyaRk2Y3r2iz+lPdMLLEtPhVhTGKXw+EsT1KgQUrA6F+h5BO1woocGPobXazWMM4z5FEkE+bJ7uv/H60mzKLF6LnUBPaauE/PVY30eAgn+t0YRceIiQ1k9df1VAjcRO65jRPWRm0rP0LE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.062077, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Nov 21, 2023 at 11:02=E2=80=AFPM Ilya Leoshkevich wrote: > > s390 uses assembly code to initialize ftrace_regs and call > kprobe_ftrace_handler(). Therefore, from the KMSAN's point of view, > ftrace_regs is poisoned on kprobe_ftrace_handler() entry. This causes > KMSAN warnings when running the ftrace testsuite. > > Fix by trusting the assembly code and always unpoisoning ftrace_regs in > kprobe_ftrace_handler(). > > Signed-off-by: Ilya Leoshkevich Reviewed-by: Alexander Potapenko