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Received: from willy by casper.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1rTPjW-0000000EHJ0-2Q1F; Fri, 26 Jan 2024 17:11:15 +0000 Date: Fri, 26 Jan 2024 17:11:14 +0000 From: Matthew Wilcox To: Chenyuan Yang Cc: akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, syzkaller@googlegroups.com, Zijie Zhao , John Hubbard Subject: Re: [Linux Kernel Bug][mm/gup] 3 Warning Crashes: kmalloc bug in gup_test_ioctl, is_valid_gup_args, pin_user_pages_fast Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 709711C001C X-Rspam-User: X-Stat-Signature: 1w8paetk7gmzss9ekiu8ot96z5j3d5cz X-Rspamd-Server: rspam01 X-HE-Tag: 1706289078-483329 X-HE-Meta: U2FsdGVkX1+9PHxRQIP5hbQP6JZX93wRG/XqSYVuTMi6B3Tn7z/FSG1vmmtcX2HJBxyMzgx3bSU0oFiFZvHOK6qLgyC+4AZojyb28cW4a5IwhCiIIfdrC4mbTJtpBZx+GvZzLtcxlgAOTiqk3wfW/pFFG4DPum1bZj1xKQD+YAmoCFTi33LCFb9MFDw5d0mXe8KS/aTzcYejPpdktvi26fwxoRrsqBVT/W2ZvEOct5ZeHF3wUPKuea+qJMSHA96d9ol9iXgTig7F5kGE55X3QwQJTx2NWGZAuaYUTXk94FC7hnugpD1rxVe1XWJD8m4mz00niCjOZRGearoiOqIcFEMDEdiJO0cJP/AsnRnAKsuNs9xD504ozsYQK0MAJuQfRK7kV/LVYW9PEK/EI7Avl7lytWGB+b7mBBgMyU9Pqsi6VFvnvSQtTWngWhU4skMg93XRUqYkhTnAC4O7Dl0IWNR3IXPngXhSRWc982hklrolJgX2SGA5aa0mOKS8h1ic2I8yFwZ80l9jKp4xpS1ZLCgDBSMZHD3oK5KfkloasfJmelr6FbTGThHMX53fbuPG5YsgowDmZ/bszWWGN+7b+65qMRiXgUD3YXlH1q0sVIRemMGsR5cjCBmYru6JYvPWIFRJzplifAgS2RXGRdUKppEK5Lsa7GF4WjmWRP87/zY2Q22pCj65u9JZIp7/o887iaY5nj8ZXdkaj2csvlizUfZHDgVdQYlmmqHUxBMluOmVlgmHn/+ZjkEmQVHVJbd3oDLxznGK+aQnnd+X5LAWc0S/c/69J03JOe70SrI95uwe7/SSZBoWPCawKW+T4vQvYFjxYbMgz1Vo1O5446/YvOcX4YG8oc0xZniiAYUP7P3t7FvPt+lkXGejyBiH0FFGWT2fNBHH3lYOuyAeK9xmY/O5TM5YWp+yFlCqS6KdQfz1Jlfx0hmnKP2/wKb9wfss832mmo9ECzmV83FsySC TQ63k2Y5 Ky62/YLeCDVbUVKBoFC2DlejLA1twoBpiD4o6Al3klJWRs2Q8jPp58jxr4BySf1F33VlIz3egOOIC7bd5x+f2h+suNgOqsOXTPJpVzP04W/daR7t2FypMobYtc5Wo6bs5RorWZhp/CgYG09mVRdqx+nua+q6xwq+vda9Qr8goiItdxXaDdLy+GPDAnw== 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: List-Subscribe: List-Unsubscribe: On Fri, Jan 26, 2024 at 11:04:53AM -0600, Chenyuan Yang wrote: > Dear Developers for Linux Memory Management, > > We encountered 3 warning crashes when testing the memory management > with Syzkaller and our generated specifications: These all come in through gup_test_ioctl(). It's my impression that this is something you can enable to wreak havoc on your kernel and it's not something which should ever be exposed to fuzzers.