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jLUjEK740GMsIAAAMHmgww (envelope-from ); Wed, 25 Jan 2023 09:38:54 +0000 Date: Wed, 25 Jan 2023 10:38:53 +0100 From: Michal Hocko To: Suren Baghdasaryan Cc: akpm@linux-foundation.org, michel@lespinasse.org, jglisse@google.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, ldufour@linux.ibm.com, paulmck@kernel.org, luto@kernel.org, songliubraving@fb.com, peterx@redhat.com, david@redhat.com, dhowells@redhat.com, hughd@google.com, bigeasy@linutronix.de, kent.overstreet@linux.dev, punit.agrawal@bytedance.com, lstoakes@gmail.com, peterjung1337@gmail.com, rientjes@google.com, axelrasmussen@google.com, joelaf@google.com, minchan@google.com, jannh@google.com, shakeelb@google.com, tatashin@google.com, edumazet@google.com, gthelen@google.com, gurua@google.com, arjunroy@google.com, soheil@google.com, hughlynch@google.com, leewalsh@google.com, posk@google.com, will@kernel.org, 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kasan-dev@googlegroups.com, selinux@vger.kernel.org, alsa-devel@alsa-project.org, kernel-team@android.com Subject: Re: [PATCH v2 4/6] mm: replace vma->vm_flags indirect modification in ksm_madvise Message-ID: References: <20230125083851.27759-1-surenb@google.com> <20230125083851.27759-5-surenb@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230125083851.27759-5-surenb@google.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230125_013856_568655_E121E10E X-CRM114-Status: UNSURE ( 7.58 ) X-CRM114-Notice: Please train this message. X-Mailman-Approved-At: Wed, 25 Jan 2023 03:28:27 -0800 X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org On Wed 25-01-23 00:38:49, Suren Baghdasaryan wrote: > Replace indirect modifications to vma->vm_flags with calls to modifier > functions to be able to track flag changes and to keep vma locking > correctness. Add a BUG_ON check in ksm_madvise() to catch indirect > vm_flags modification attempts. Those BUG_ONs scream to much IMHO. KSM is an MM internal code so I gueess we should be willing to trust it. > Signed-off-by: Suren Baghdasaryan Acked-by: Michal Hocko -- Michal Hocko SUSE Labs _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um