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Sat, 08 Jul 2023 12:12:21 -0700 (PDT) Date: Sat, 8 Jul 2023 12:12:12 -0700 In-Reply-To: <20230708191212.4147700-1-surenb@google.com> Mime-Version: 1.0 References: <20230708191212.4147700-1-surenb@google.com> X-Mailer: git-send-email 2.41.0.390.g38632f3daf-goog Message-ID: <20230708191212.4147700-3-surenb@google.com> Subject: [PATCH v2 3/3] fork: lock VMAs of the parent process when forking From: Suren Baghdasaryan To: torvalds@linux-foundation.org Cc: akpm@linux-foundation.org, regressions@leemhuis.info, bagasdotme@gmail.com, jacobly.alt@gmail.com, willy@infradead.org, liam.howlett@oracle.com, david@redhat.com, peterx@redhat.com, ldufour@linux.ibm.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, gregkh@linuxfoundation.org, regressions@lists.linux.dev, Suren Baghdasaryan , Jiri Slaby , "=?UTF-8?q?Holger=20Hoffst=C3=A4tte?=" , stable@vger.kernel.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230708_121222_260713_86EBDD8E X-CRM114-Status: GOOD ( 13.15 ) X-BeenThere: linux-arm-kernel@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="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org V2hlbiBmb3JraW5nIGEgY2hpbGQgcHJvY2VzcywgcGFyZW50IHdyaXRlLXByb3RlY3RzIGFuIGFu b255bW91cyBwYWdlCmFuZCBDT1ctc2hhcmVzIGl0IHdpdGggdGhlIGNoaWxkIGJlaW5nIGZvcmtl ZCB1c2luZyBjb3B5X3ByZXNlbnRfcHRlKCkuClBhcmVudCdzIFRMQiBpcyBmbHVzaGVkIHJpZ2h0 IGJlZm9yZSB3ZSBkcm9wIHRoZSBwYXJlbnQncyBtbWFwX2xvY2sgaW4KZHVwX21tYXAoKS4gSWYg d2UgZ2V0IGEgd3JpdGUtZmF1bHQgYmVmb3JlIHRoYXQgVExCIGZsdXNoIGluIHRoZSBwYXJlbnQs CmFuZCB3ZSBlbmQgdXAgcmVwbGFjaW5nIHRoYXQgYW5vbnltb3VzIHBhZ2UgaW4gdGhlIHBhcmVu dCBwcm9jZXNzIGluCmRvX3dwX3BhZ2UoKSAoYmVjYXVzZSwgQ09XLXNoYXJlZCB3aXRoIHRoZSBj aGlsZCksIHRoaXMgbWlnaHQgbGVhZCB0bwpzb21lIHN0YWxlIHdyaXRhYmxlIFRMQiBlbnRyaWVz IHRhcmdldGluZyB0aGUgd3JvbmcgKG9sZCkgcGFnZS4KU2ltaWxhciBpc3N1ZSBoYXBwZW5lZCBp biB0aGUgcGFzdCB3aXRoIHVzZXJmYXVsdGZkIChzZWUgZmx1c2hfdGxiX3BhZ2UoKQpjYWxsIGlu c2lkZSBkb193cF9wYWdlKCkpLgpMb2NrIFZNQXMgb2YgdGhlIHBhcmVudCBwcm9jZXNzIHdoZW4g Zm9ya2luZyBhIGNoaWxkLCB3aGljaCBwcmV2ZW50cwpjb25jdXJyZW50IHBhZ2UgZmF1bHRzIGR1 cmluZyBmb3JrIG9wZXJhdGlvbiBhbmQgYXZvaWRzIHRoaXMgaXNzdWUuClRoaXMgZml4IGNhbiBw b3RlbnRpYWxseSByZWdyZXNzIHNvbWUgZm9yay1oZWF2eSB3b3JrbG9hZHMuIEtlcm5lbCBidWls ZAp0aW1lIGRpZCBub3Qgc2hvdyBub3RpY2VhYmxlIHJlZ3Jlc3Npb24gb24gYSA1Ni1jb3JlIG1h Y2hpbmUgd2hpbGUgYQpzdHJlc3MgdGVzdCBtYXBwaW5nIDEwMDAwIFZNQXMgYW5kIGZvcmtpbmcg NTAwMCB0aW1lcyBpbiBhIHRpZ2h0IGxvb3AKc2hvd3MgfjUlIHJlZ3Jlc3Npb24uIElmIHN1Y2gg Zm9yayB0aW1lIHJlZ3Jlc3Npb24gaXMgdW5hY2NlcHRhYmxlLApkaXNhYmxpbmcgQ09ORklHX1BF Ul9WTUFfTE9DSyBzaG91bGQgcmVzdG9yZSBpdHMgcGVyZm9ybWFuY2UuIEZ1cnRoZXIKb3B0aW1p emF0aW9ucyBhcmUgcG9zc2libGUgaWYgdGhpcyByZWdyZXNzaW9uIHByb3ZlcyB0byBiZSBwcm9i bGVtYXRpYy4KClN1Z2dlc3RlZC1ieTogRGF2aWQgSGlsZGVuYnJhbmQgPGRhdmlkQHJlZGhhdC5j b20+ClJlcG9ydGVkLWJ5OiBKaXJpIFNsYWJ5IDxqaXJpc2xhYnlAa2VybmVsLm9yZz4KQ2xvc2Vz OiBodHRwczovL2xvcmUua2VybmVsLm9yZy9hbGwvZGJkZWYzNGMtM2EwNy01OTUxLWUxYWUtZTlj NmUzY2RmNTFiQGtlcm5lbC5vcmcvClJlcG9ydGVkLWJ5OiBIb2xnZXIgSG9mZnN0w6R0dGUgPGhv bGdlckBhcHBsaWVkLWFzeW5jaHJvbnkuY29tPgpDbG9zZXM6IGh0dHBzOi8vbG9yZS5rZXJuZWwu b3JnL2FsbC9iMTk4ZDY0OS1mNGJmLWI5NzEtMzFkMC1lODQzM2VjMmEzNGNAYXBwbGllZC1hc3lu Y2hyb255LmNvbS8KUmVwb3J0ZWQtYnk6IEphY29iIFlvdW5nIDxqYWNvYmx5LmFsdEBnbWFpbC5j b20+CkNsb3NlczogaHR0cHM6Ly9idWd6aWxsYS5rZXJuZWwub3JnL3Nob3dfYnVnLmNnaT9pZD0y MTc2MjQKRml4ZXM6IDBiZmYwYWFlYTAzZSAoIng4Ni9tbTogdHJ5IFZNQSBsb2NrLWJhc2VkIHBh Z2UgZmF1bHQgaGFuZGxpbmcgZmlyc3QiKQpDYzogc3RhYmxlQHZnZXIua2VybmVsLm9yZwpTaWdu ZWQtb2ZmLWJ5OiBTdXJlbiBCYWdoZGFzYXJ5YW4gPHN1cmVuYkBnb29nbGUuY29tPgotLS0KIGtl cm5lbC9mb3JrLmMgfCAxICsKIDEgZmlsZSBjaGFuZ2VkLCAxIGluc2VydGlvbigrKQoKZGlmZiAt LWdpdCBhL2tlcm5lbC9mb3JrLmMgYi9rZXJuZWwvZm9yay5jCmluZGV4IGI4NTgxNGU2MTRhNS4u ZDJlMTJiNmQyYjE4IDEwMDY0NAotLS0gYS9rZXJuZWwvZm9yay5jCisrKyBiL2tlcm5lbC9mb3Jr LmMKQEAgLTY4Niw2ICs2ODYsNyBAQCBzdGF0aWMgX19sYXRlbnRfZW50cm9weSBpbnQgZHVwX21t YXAoc3RydWN0IG1tX3N0cnVjdCAqbW0sCiAJZm9yX2VhY2hfdm1hKG9sZF92bWksIG1wbnQpIHsK IAkJc3RydWN0IGZpbGUgKmZpbGU7CiAKKwkJdm1hX3N0YXJ0X3dyaXRlKG1wbnQpOwogCQlpZiAo bXBudC0+dm1fZmxhZ3MgJiBWTV9ET05UQ09QWSkgewogCQkJdm1fc3RhdF9hY2NvdW50KG1tLCBt cG50LT52bV9mbGFncywgLXZtYV9wYWdlcyhtcG50KSk7CiAJCQljb250aW51ZTsKLS0gCjIuNDEu MC4zOTAuZzM4NjMyZjNkYWYtZ29vZwoKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1r ZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWls bWFuL2xpc3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK