Message ID | 20230414142341.354556-12-shiyn.lin@gmail.com (mailing list archive) |
---|---|
State | New |
Headers | show
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(2001-b011-20e0-1499-8303-7502-d3d7-e13b.dynamic-ip6.hinet.net. [2001:b011:20e0:1499:8303:7502:d3d7:e13b]) by smtp.googlemail.com with ESMTPSA id h7-20020a17090ac38700b0022335f1dae2sm2952386pjt.22.2023.04.14.07.25.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Apr 2023 07:26:02 -0700 (PDT) From: Chih-En Lin <shiyn.lin@gmail.com> To: Andrew Morton <akpm@linux-foundation.org>, Qi Zheng <zhengqi.arch@bytedance.com>, David Hildenbrand <david@redhat.com>, "Matthew Wilcox (Oracle)" <willy@infradead.org>, Christophe Leroy <christophe.leroy@csgroup.eu>, John Hubbard <jhubbard@nvidia.com>, Nadav Amit <namit@vmware.com>, Barry Song <baohua@kernel.org>, Pasha Tatashin <pasha.tatashin@soleen.com> Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>, "H. Peter Anvin" <hpa@zytor.com>, Steven Rostedt <rostedt@goodmis.org>, Masami Hiramatsu <mhiramat@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Arnaldo Carvalho de Melo <acme@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Alexander Shishkin <alexander.shishkin@linux.intel.com>, Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>, Ian Rogers <irogers@google.com>, Adrian Hunter <adrian.hunter@intel.com>, Yu Zhao <yuzhao@google.com>, Steven Barrett <steven@liquorix.net>, Juergen Gross <jgross@suse.com>, Peter Xu <peterx@redhat.com>, Kefeng Wang <wangkefeng.wang@huawei.com>, Tong Tiangen <tongtiangen@huawei.com>, Christoph Hellwig <hch@infradead.org>, "Liam R. Howlett" <Liam.Howlett@Oracle.com>, Yang Shi <shy828301@gmail.com>, Vlastimil Babka <vbabka@suse.cz>, Alex Sierra <alex.sierra@amd.com>, Vincent Whitchurch <vincent.whitchurch@axis.com>, Anshuman Khandual <anshuman.khandual@arm.com>, Li kunyu <kunyu@nfschina.com>, Liu Shixin <liushixin2@huawei.com>, Hugh Dickins <hughd@google.com>, Minchan Kim <minchan@kernel.org>, Joey Gouly <joey.gouly@arm.com>, Chih-En Lin <shiyn.lin@gmail.com>, Michal Hocko <mhocko@suse.com>, Suren Baghdasaryan <surenb@google.com>, "Zach O'Keefe" <zokeefe@google.com>, Gautam Menghani <gautammenghani201@gmail.com>, Catalin Marinas <catalin.marinas@arm.com>, Mark Brown <broonie@kernel.org>, "Eric W. Biederman" <ebiederm@xmission.com>, Andrei Vagin <avagin@gmail.com>, Shakeel Butt <shakeelb@google.com>, Daniel Bristot de Oliveira <bristot@kernel.org>, "Jason A. Donenfeld" <Jason@zx2c4.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Alexey Gladkov <legion@kernel.org>, x86@kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Dinglan Peng <peng301@purdue.edu>, Pedro Fonseca <pfonseca@purdue.edu>, Jim Huang <jserv@ccns.ncku.edu.tw>, Huichun Feng <foxhoundsk.tw@gmail.com> Subject: [PATCH v5 11/17] mm/mprotect: Break COW PTE before changing protection Date: Fri, 14 Apr 2023 22:23:35 +0800 Message-Id: <20230414142341.354556-12-shiyn.lin@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230414142341.354556-1-shiyn.lin@gmail.com> References: <20230414142341.354556-1-shiyn.lin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: EB43040025 X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: bdrod7rtdzxbx13ceq1egptyzetkbpen X-HE-Tag: 1681482363-802524 X-HE-Meta: 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 9fxNw/TL trOAbyWeOGgo6YbHqm0+SsqknwhbuxxHZ6jl+s0eKsSr8K4s8pPJL8+5SU+qm1ENlqxbqs8QNJmMftHdumRAd+mvlaSqg+4Um+XkZh3Y1YoTVhI4Dcx03mAwk/fd6L3OQHBOWOxFWwHXJgHLNPolUQeU/FfCEVFZy4A+EfG6kkEtTjImFo7gsFecWJR0Gpe+0vo8x0Nh04LERxTCxfWeBKDjJQ2nzMx0VwShBulSbOwxtUBTKxsNydPcoSyNrZfbaBO/ligSEqaRWq/4soB4fHehgc1OXtYqXuYaD40lwbfsDm6bvsAsal+xDAuGs3IiVYrKmLafc3eAeMlVjE1jgJWgLZSat6QxGYvPC0fVapJVOq+0aUizMS6BcqB/Z2S7Gw4cWQ1djc/wuPl9+U9K4ZT0TiHLU4IaZoVsJYBJfnOdLU5qN4eZh9UyU3liTdiz9wOP+XxIVJ0i/z6+AVR5JtVE/FQh/UPf8mqUoKD3DfwtSGbG0kElNLyV4y1LnemrmS4g0mOgUrzg2gNiq9AofZkp1LKmobDDtk0/isL5KXm8mg50aBZhNYOS3UtKTU7aNUord 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: <linux-mm.kvack.org> |
Series |
Introduce Copy-On-Write to Page Table
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expand
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diff --git a/mm/mprotect.c b/mm/mprotect.c index 13e84d8c0797..a33f23a73fa5 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -103,6 +103,9 @@ static long change_pte_range(struct mmu_gather *tlb, if (pmd_trans_unstable(pmd)) return 0; + if (break_cow_pte(vma, pmd, addr)) + return 0; + /* * The pmd points to a regular pte so the pmd can't change * from under us even if the mmap_lock is only hold for @@ -312,6 +315,12 @@ static inline int pmd_none_or_clear_bad_unless_trans_huge(pmd_t *pmd) return 1; if (pmd_trans_huge(pmdval)) return 0; + /* + * If the entry point to COW-ed PTE, it's write protection bit + * will cause pmd_bad(). + */ + if (!pmd_write(pmdval)) + return 0; if (unlikely(pmd_bad(pmdval))) { pmd_clear_bad(pmd); return 1;
If the PTE table is COW-ed, break it before changing the protection. Signed-off-by: Chih-En Lin <shiyn.lin@gmail.com> --- mm/mprotect.c | 9 +++++++++ 1 file changed, 9 insertions(+)