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s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=mPq1xxojTLCMg9dkpihVuEy7NB86hVAVpi/132X7kAw=; b=VqsC+IGpXQ7NqVFBUouqmFlbSHbiOeFCnAJ2DG146uFS7nlOanzaxttjj/ysAhNPkI OotogMTKuiGrwXuAXI0nGEqeqMYJirTiWXUvi5Id+ImZ1A5jChrDPhvcwD/gOwaZlSuq dKsqKHVbC+oZLFn2fFarOVF8ZRi18ZB2DAsNNHn8lVGk9vrnp+75hoOxNSdrpuuLyN/z osP+LCdpoIzaWo4XuCGKbCvMMt+dUFMC48vqhYWPtTkUFUeLS0ubqSi+4x2xXRFDp3FS xGePtNS1iGg229CruFYr5d92adH908KATNFBf5yzuNQtIBrAObo8K4vbT6KcBfCGqAjr Pizw== X-Gm-Message-State: AOAM532PKiUd8SBdeA6HJAMPZj0qFLEkAh50BnLGRHbgAl717Q6jgANB gy3EMkPe4g0labNMOKV8QUme9x9IBBRB6xLZigzbMw== X-Google-Smtp-Source: ABdhPJzMoyVci79YwTV4KRMhMNBvKksmGgmX62puAUjhkzpwpVCVuG2Q30QHXgEacyFzXNHAtggJkv+M7hW6xpUief0= X-Received: by 2002:a62:6408:0:b029:154:dde2:a5eb with SMTP id y8-20020a6264080000b0290154dde2a5ebmr3767384pfb.30.1603386055586; Thu, 22 Oct 2020 10:00:55 -0700 (PDT) MIME-Version: 1.0 References: <80a2e5fa-718a-8433-1ab0-dd5b3e3b5416@redhat.com> <5d2ecb24db1e415b8ff88261435386ec@AcuMS.aculab.com> <20201022090155.GA1483166@kroah.com> <5fd6003b-55a6-2c3c-9a28-8fd3a575ca78@redhat.com> <20201022132342.GB8781@lst.de> <8f1fff0c358b4b669d51cc80098dbba1@AcuMS.aculab.com> <20201022164040.GV20115@casper.infradead.org> In-Reply-To: <20201022164040.GV20115@casper.infradead.org> From: Nick Desaulniers Date: Thu, 22 Oct 2020 10:00:44 -0700 Message-ID: Subject: Re: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c" To: Matthew Wilcox Cc: David Laight , Christoph Hellwig , David Hildenbrand , Greg KH , Al Viro , "kernel-team@android.com" , Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-mips@vger.kernel.org" , "linux-parisc@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-s390@vger.kernel.org" , "sparclinux@vger.kernel.org" , "linux-block@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "linux-aio@kvack.org" , "io-uring@vger.kernel.org" , "linux-arch@vger.kernel.org" , "linux-mm@kvack.org" , "netdev@vger.kernel.org" , "keyrings@vger.kernel.org" , "linux-security-module@vger.kernel.org" Content-Type: text/plain; charset="UTF-8" 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 Thu, Oct 22, 2020 at 9:40 AM Matthew Wilcox wrote: > > On Thu, Oct 22, 2020 at 04:35:17PM +0000, David Laight wrote: > > Wait... > > readv(2) defines: > > ssize_t readv(int fd, const struct iovec *iov, int iovcnt); > > It doesn't really matter what the manpage says. What does the AOSP > libc header say? Same: https://android.googlesource.com/platform/bionic/+/refs/heads/master/libc/include/sys/uio.h#38 Theoretically someone could bypass libc to make a system call, right? > > > But the syscall is defined as: > > > > SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec, > > unsigned long, vlen) > > { > > return do_readv(fd, vec, vlen, 0); > > } > -- Thanks, ~Nick Desaulniers