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Wed, 26 Aug 2020 06:36:28 -0700 Received: from ADC-EXAPAC11.tw.trendnet.org (10.28.2.228) by ADC-EXAPAC12.tw.trendnet.org (10.28.2.229) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3; Wed, 26 Aug 2020 13:36:15 +0000 Received: from ADC-EXAPAC11.tw.trendnet.org ([fe80::e9de:ebb1:bcf0:5913]) by ADC-EXAPAC11.tw.trendnet.org ([fe80::e9de:ebb1:bcf0:5913%18]) with mapi id 15.01.1979.003; Wed, 26 Aug 2020 13:36:15 +0000 From: "Eddy_Wu@trendmicro.com" To: "peterz@infradead.org" CC: "mhiramat@kernel.org" , "linux-kernel@vger.kernel.org" , "x86@kernel.org" Subject: RE: x86/kprobes: kretprobe fails to triggered if kprobe at function entry is not optimized (trigger by int3 breakpoint) Thread-Topic: x86/kprobes: kretprobe fails to triggered if kprobe at function entry is not optimized (trigger by int3 breakpoint) Thread-Index: AdZ5/y9ucVi7Kf0NSwa8vnc6Q/ol0wAL6hEAAAENaQAAHQZRAAAMWPyAACXNoJAABJOdgAABikmAAAHiM4AAAOAdgAACKGhg Date: Wed, 26 Aug 2020 13:36:15 +0000 Message-ID: <42c65d9e434945c183ead8bef3d89de2@trendmicro.com> References: <8816bdbbc55c4d2397e0b02aad2825d3@trendmicro.com> <20200825005426.f592075d13be740cb3c9aa77@kernel.org> <7396e7b2079644a6aafd9670a111232b@trendmicro.com> <20200825151538.f856d701a34f4e0561a64932@kernel.org> <20200825120911.GX1362448@hirez.programming.kicks-ass.net> <20200826172239.ff175be78ee5f3a4380579c3@kernel.org> <20200826180645.9b609fc05df2a149564df1b8@kernel.org> <20200826190041.2d0ff0fbe154ba62163b0c00@kernel.org> <20200826102545.GF1362448@hirez.programming.kicks-ass.net> In-Reply-To: <20200826102545.GF1362448@hirez.programming.kicks-ass.net> Accept-Language: zh-TW, en-US Content-Language: zh-TW X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.28.4.6] X-TM-AS-Product-Ver: IMSVA-9.1.0.1960-8.6.0.1013-25626.007 X-TM-AS-Result: No--29.835-5.0-31-10 X-TMASE-MatchedRID: Nu4omozL6aLUL3YCMmnG4vHkpkyUphL9Ud7Bjfo+5jRd964B0EJ1lSio vVyGVXbFKmeI7ghTOjcXjjynQV89QI3sS3MVuiP/X1J8nCIowYDdXhRKGhNdp+jnKWtZ9LTLoML A09Q7YQVlfORP6fQwh1E3gGKuv1qSGcUcwv8O6FRFM72aEhcbjUzzNX6FuGYD5wA4LRxAiq/v8k ZFnw+AJ30h0t4LRJU4RwWmLxdIcSgXgBGQGIGL/vRUId35VCIeB5sxzt03wPgUZ5IS2TgivZlZS zHeHjGRunnGSiVNIJ9aHQACyuJADmNz5op/462xlxI7MMLiequsxB8h8Z7XRha1b8SJLTWfqCgi pHiRLo7ejnZr6Lh3iyGqq99jJVWlQo+W44QpPf83X0+M8lqGUmru/VhgywnpDO+DX+rUwfZYerV ulKHl4guUBPzAgA1JZwwPubhdqok4LhgP3hW5wO9VsdrlGzy3mHAp2UJ8+TybKItl61J/yfmS+a Pr0Ve8WhMF7hZwoTHkwjHXXC/4I+JGF26G8SWy5yM0c1ktj9M= X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--29.835300-10.000000 X-TMASE-Version: IMSVA-9.1.0.1960-8.6.1013-25626.007 Content-Type: text/plain; charset="big5" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-TM-SNTS-SMTP: B3A37DDF16EDA88C1F8E1A494924CC34B1826E36B5548708DA01140964237D092000:8 X-TM-AS-GCONF: 00 X-imss-scan-details: No--29.835-5.0-31-10 X-TMASE-SNAP-Result: 1.821001.0001-0-1-12:0,22:0,33:0,34:0-0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org DQoNCj4gLS0tLS1PcmlnaW5hbCBNZXNzYWdlLS0tLS0NCj4gRnJvbTogcGV0ZXJ6QGluZnJhZGVh ZC5vcmcgPHBldGVyekBpbmZyYWRlYWQub3JnPg0KPiBTZW50OiBXZWRuZXNkYXksIEF1Z3VzdCAy NiwgMjAyMCA2OjI2IFBNDQo+IFRvOiBNYXNhbWkgSGlyYW1hdHN1IDxtaGlyYW1hdEBrZXJuZWwu b3JnPg0KPiBDYzogRWRkeSBXdSAoUkQtVFcpIDxFZGR5X1d1QHRyZW5kbWljcm8uY29tPjsgbGlu dXgta2VybmVsQHZnZXIua2VybmVsLm9yZzsgeDg2QGtlcm5lbC5vcmcNCj4gU3ViamVjdDogUmU6 IHg4Ni9rcHJvYmVzOiBrcmV0cHJvYmUgZmFpbHMgdG8gdHJpZ2dlcmVkIGlmIGtwcm9iZSBhdCBm dW5jdGlvbiBlbnRyeSBpcyBub3Qgb3B0aW1pemVkICh0cmlnZ2VyIGJ5IGludDMgYnJlYWtwb2lu dCkNCj4NCj4gT24gV2VkLCBBdWcgMjYsIDIwMjAgYXQgMDc6MDA6NDFQTSArMDkwMCwgTWFzYW1p IEhpcmFtYXRzdSB3cm90ZToNCj4gPiBPZiBjb3Vyc2UsIHRoaXMgZG9lc24ndCBzb2x2ZSB0aGUg bGxpc3RfZGVsX2ZpcnN0KCkgY29udGVudGlvbiBpbiB0aGUNCj4gPiBwcmVfa3JldHByb2JlX2hh bmRsZXIoKS4gU28gYW55d2F5IHdlIG5lZWQgYSBsb2NrIGZvciBwZXItcHJvYmUgbGxpc3QNCj4g PiAoaWYgSSB1bmRlcnN0YW5kIGxsaXN0LmggY29tbWVudCBjb3JyZWN0bHkuKQ0KPg0KPiBCYWgs IGxlbW1lIHRoaW5rIGFib3V0IHRoYXQuIEtwcm9iZXMgcmVhbGx5IHNob3VsZG4ndCBiZSB1c2lu ZyBsb2NrcyA6Lw0KDQpNYXliZSB3ZSBjYW4gaGF2ZSBwZXItY3B1IGZyZWUgbGlzdCBmb3IgcmV0 cHJvYmVfaW5zdGFuY2U/DQpUaGlzIGVuc3VyZSB3ZSBvbmx5IGhhdmUgb25lIHVzZXIgcmVxdWVz dGluZyBmcmVlIGluc3RhbmNlIGF0IGEgdGltZSwgZ2l2ZW4gdGhhdCBwcmVfa3JldHByb2JlX2hh bmRsZXIoKSB3b250IHJlY3Vyc2l2ZS4NCg0KV2UgbWF5IGJlIHdhc3RpbmcgbWVtb3J5IGlmIHRh cmdldCBmdW5jdGlvbiBwZXJmZXIgc29tZSBjcHUgdGhvdWdoLg0KDQoNClRSRU5EIE1JQ1JPIEVN QUlMIE5PVElDRQ0KDQpUaGUgaW5mb3JtYXRpb24gY29udGFpbmVkIGluIHRoaXMgZW1haWwgYW5k IGFueSBhdHRhY2htZW50cyBpcyBjb25maWRlbnRpYWwgYW5kIG1heSBiZSBzdWJqZWN0IHRvIGNv cHlyaWdodCBvciBvdGhlciBpbnRlbGxlY3R1YWwgcHJvcGVydHkgcHJvdGVjdGlvbi4gSWYgeW91 IGFyZSBub3QgdGhlIGludGVuZGVkIHJlY2lwaWVudCwgeW91IGFyZSBub3QgYXV0aG9yaXplZCB0 byB1c2Ugb3IgZGlzY2xvc2UgdGhpcyBpbmZvcm1hdGlvbiwgYW5kIHdlIHJlcXVlc3QgdGhhdCB5 b3Ugbm90aWZ5IHVzIGJ5IHJlcGx5IG1haWwgb3IgdGVsZXBob25lIGFuZCBkZWxldGUgdGhlIG9y aWdpbmFsIG1lc3NhZ2UgZnJvbSB5b3VyIG1haWwgc3lzdGVtLg0KDQpGb3IgZGV0YWlscyBhYm91 dCB3aGF0IHBlcnNvbmFsIGluZm9ybWF0aW9uIHdlIGNvbGxlY3QgYW5kIHdoeSwgcGxlYXNlIHNl ZSBvdXIgUHJpdmFjeSBOb3RpY2Ugb24gb3VyIHdlYnNpdGUgYXQ6IFJlYWQgcHJpdmFjeSBwb2xp Y3k8aHR0cDovL3d3dy50cmVuZG1pY3JvLmNvbS9wcml2YWN5Pg0K