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b=r9jqh2h0KZZYZDtige5DCcjtRdrHmZkgGSr8rZMOFWKpJy1OdDEi7LOi2yZ3k5zxU pX49HvM6qmrYYrktUFzgmf25B8sOQRcP2waURBl3xafOLof6sYReACF9Fj1+p9llRU idlDYn4fyWUYJTfs9sSyEosdV28AaeeUrJhiYQXJ/Vxh6lRbPWP2sNoBs0fLLmQOgT vk9/kSZHMH6u7WOrHm8UXq2xIjNeFdyC77dPnjWOQnOwOqlk4OvjpTUkLodqyVtzl5 83TkrtHmk+GprKipP+hWghNkre09QTCOZS3nR5X/OYsgCE9uVNrt4DfwMz7rwI9pMG wSzsLl261S5PQ== Date: Thu, 10 Aug 2023 17:42:26 -0700 From: Kees Cook To: Justin Stitt , Kees Cook CC: Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: Re: [PATCH] arm64/sysreg: refactor deprecated strncpy User-Agent: K-9 Mail for Android In-Reply-To: References: <20230810-strncpy-arch-arm64-v1-1-f67f3685cd64@google.com> <202308101155.81497C5B@keescook> <202308101257.47E6ACBD5@keescook> Message-ID: <4EF40BD8-9FBA-4D01-B2F4-154D32A503EB@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230810_174232_682304_4DF21206 X-CRM114-Status: GOOD ( 29.85 ) 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 T24gQXVndXN0IDEwLCAyMDIzIDI6MTc6NDEgUE0gUERULCBKdXN0aW4gU3RpdHQgPGp1c3RpbnN0 aXR0QGdvb2dsZS5jb20+IHdyb3RlOgo+T24gVGh1LCBBdWcgMTAsIDIwMjMgYXQgMTI6NTjigK9Q TSBLZWVzIENvb2sgPGtlZXNjb29rQGNocm9taXVtLm9yZz4gd3JvdGU6Cj4+Cj4+IE9uIFRodSwg QXVnIDEwLCAyMDIzIGF0IDEyOjI1OjM3UE0gLTA3MDAsIEp1c3RpbiBTdGl0dCB3cm90ZToKPj4g PiBPbiBUaHUsIEF1ZyAxMCwgMjAyMyBhdCAxMjowMOKAr1BNIEtlZXMgQ29vayA8a2Vlc2Nvb2tA Y2hyb21pdW0ub3JnPiB3cm90ZToKPj4gPiA+Cj4+ID4gPiBPbiBUaHUsIEF1ZyAxMCwgMjAyMyBh dCAwNjozOTowM1BNICswMDAwLCBKdXN0aW4gU3RpdHQgd3JvdGU6Cj4+ID4gPiA+IGBzdHJuY3B5 YCBpcyBkZXByZWNhdGVkIGZvciB1c2Ugb24gTlVMLXRlcm1pbmF0ZWQgZGVzdGluYXRpb24gc3Ry aW5ncwo+PiA+ID4gPiBbMV0uIFdoaWNoIHNlZW1zIHRvIGJlIHRoZSBjYXNlIGhlcmUgZHVlIHRv IHRoZSBmb3JjZWZ1bCBzZXR0aW5nIG9mIGBidWZgJ3MKPj4gPiA+ID4gdGFpbCB0byAwLgo+PiA+ ID4KPj4gPiA+IEFub3RoZXIgbm90ZSB0byBpbmNsdWRlIGluIHRoZXNlIGV2YWx1YXRpb25zIHdv dWxkIGJlICJkb2VzIHRoZQo+PiA+ID4gZGVzdGluYXRpb24gZXhwZWN0IHRvIGJlICVOVUwgcGFk ZGVkPyIuIEhlcmUsIGl0IGxvb2tzIGxpa2Ugbm8sIGFzIGFsbAo+PiA+ID4gdGhlIHJvdXRpbmVz ICJidWYiIGlzIHBhc3NlZCB0byBleHBlY3QgYSByZWd1bGFyIEMgc3RyaW5nIChwYWRkaW5nCj4+ ID4gPiBkb2Vzbid0IG1hdHRlcikuCj4+ID4gPgo+PiA+ID4gPgo+PiA+ID4gPiBBIHN1aXRhYmxl IHJlcGxhY2VtZW50IGlzIGBzdHJzY3B5YCBbMl0gZHVlIHRvIHRoZSBmYWN0IHRoYXQgaXQKPj4g PiA+ID4gZ3VhcmFudGVlcyBOVUwtdGVybWluYXRpb24gb24gaXRzIGRlc3RpbmF0aW9uIGJ1ZmZl ciBhcmd1bWVudCB3aGljaCBpcwo+PiA+ID4gPiBfbm90XyB0aGUgY2FzZSBmb3IgYHN0cm5jcHlg IQo+PiA+ID4gPgo+PiA+ID4gPiBJbiB0aGlzIGNhc2UsIHRoZXJlIGlzIHNvbWUgYmVoYXZpb3Ig YmVpbmcgdXNlZCBpbiBjb25qdW5jdGlvbiB3aXRoCj4+ID4gPiA+IGBzdHJuY3B5YCB0aGF0IGBz dHJzY3B5YCBhbHJlYWR5IGltcGxlbWVudHMuIFRoaXMgbWVhbnMgd2UgY2FuIGRyb3Agc29tZQo+ PiA+ID4gPiBvZiB0aGUgZXh0cmEgc3R1ZmYgbGlrZSBgLi4uIC0xYCBhbmQgYGJ1ZltsZW5dID0g MGAKPj4gPiA+ID4KPj4gPiA+ID4gVGhpcyBzaG91bGQgaGF2ZSBubyBmdW5jdGlvbmFsIGNoYW5n ZSBhbmQgeWV0IHVzZXMgYSBtb3JlIHJvYnVzdCBhbmQKPj4gPiA+ID4gbGVzcyBhbWJpZ3VvdXMg aW50ZXJmYWNlIHdoaWxzdCByZWR1Y2luZyBjb2RlIGNvbXBsZXhpdHkuCj4+ID4gPiA+Cj4+ID4g PiA+IExpbms6IHd3dy5rZXJuZWwub3JnL2RvYy9odG1sL2xhdGVzdC9wcm9jZXNzL2RlcHJlY2F0 ZWQuaHRtbCNzdHJuY3B5LW9uLW51bC10ZXJtaW5hdGVkLXN0cmluZ3NbMV0KPj4gPiA+ID4gTGlu azogaHR0cHM6Ly9tYW5wYWdlcy5kZWJpYW4ub3JnL3Rlc3RpbmcvbGludXgtbWFudWFsLTQuOC9z dHJzY3B5LjkuZW4uaHRtbCBbMl0KPj4gPiA+ID4gTGluazogaHR0cHM6Ly9naXRodWIuY29tL0tT UFAvbGludXgvaXNzdWVzLzkwCj4+ID4gPiA+IENjOiBsaW51eC1oYXJkZW5pbmdAdmdlci5rZXJu ZWwub3JnCj4+ID4gPiA+Cj4+ID4gPiA+IFNpZ25lZC1vZmYtYnk6IEp1c3RpbiBTdGl0dCA8anVz dGluc3RpdHRAZ29vZ2xlLmNvbT4KPj4gPiA+ID4gLS0tCj4+ID4gPiA+IEZvciByZWZlcmVuY2Us IHNlZSBhIHBhcnQgb2YgYHN0cnNjcHlgJ3MgaW1wbGVtZW50YXRpb24gaGVyZToKPj4gPiA+ID4K Pj4gPiA+ID4gfCAgICAgLyogSGl0IGJ1ZmZlciBsZW5ndGggd2l0aG91dCBmaW5kaW5nIGEgTlVM OyBmb3JjZSBOVUwtdGVybWluYXRpb24uICovCj4+ID4gPiA+IHwgICAgIGlmIChyZXMpCj4+ID4g PiA+IHwgICAgICAgICAgICAgZGVzdFtyZXMtMV0gPSAnXDAnOwo+PiA+ID4gPgo+PiA+ID4gPiBO b3RlOiBjb21waWxlIHRlc3RlZAo+PiA+ID4gPiAtLS0KPj4gPiA+ID4gIGFyY2gvYXJtNjQva2Vy bmVsL2lkcmVnLW92ZXJyaWRlLmMgfCA1ICsrLS0tCj4+ID4gPiA+ICAxIGZpbGUgY2hhbmdlZCwg MiBpbnNlcnRpb25zKCspLCAzIGRlbGV0aW9ucygtKQo+PiA+ID4gPgo+PiA+ID4gPiBkaWZmIC0t Z2l0IGEvYXJjaC9hcm02NC9rZXJuZWwvaWRyZWctb3ZlcnJpZGUuYyBiL2FyY2gvYXJtNjQva2Vy bmVsL2lkcmVnLW92ZXJyaWRlLmMKPj4gPiA+ID4gaW5kZXggMmZlMjQ5MWI2OTJjLi40ODJkYzVj NzFlOTAgMTAwNjQ0Cj4+ID4gPiA+IC0tLSBhL2FyY2gvYXJtNjQva2VybmVsL2lkcmVnLW92ZXJy aWRlLmMKPj4gPiA+ID4gKysrIGIvYXJjaC9hcm02NC9rZXJuZWwvaWRyZWctb3ZlcnJpZGUuYwo+ PiA+ID4gPiBAQCAtMjYyLDkgKzI2Miw4IEBAIHN0YXRpYyBfX2luaXQgdm9pZCBfX3BhcnNlX2Nt ZGxpbmUoY29uc3QgY2hhciAqY21kbGluZSwgYm9vbCBwYXJzZV9hbGlhc2VzKQo+PiA+ID4gPiAg ICAgICAgICAgICAgIGlmICghbGVuKQo+PiA+ID4gPiAgICAgICAgICAgICAgICAgICAgICAgcmV0 dXJuOwo+PiA+ID4gPgo+PiA+ID4gPiAtICAgICAgICAgICAgIGxlbiA9IG1pbihsZW4sIEFSUkFZ X1NJWkUoYnVmKSAtIDEpOwo+PiA+ID4gPiAtICAgICAgICAgICAgIHN0cm5jcHkoYnVmLCBjbWRs aW5lLCBsZW4pOwo+PiA+ID4gPiAtICAgICAgICAgICAgIGJ1ZltsZW5dID0gMDsKPj4gPiA+ID4g KyAgICAgICAgICAgICBsZW4gPSBtaW4obGVuLCBBUlJBWV9TSVpFKGJ1ZikpOwo+PiA+ID4gPiAr ICAgICAgICAgICAgIHN0cnNjcHkoYnVmLCBjbWRsaW5lLCBsZW4pOwo+UGVyaGFwcyBrZWVwaW5n IHRoZSBgLi4uICAtIDFgIGlzIGdvb2QgYmVjYXVzZSB3ZSB0aGVuIGRvbid0IGhhdmUgdG8KPmNo ZWNrIHN0cmxlbiBpbW1lZGlhdGVseSBhZnRlci4gVGhpcyBkb2VzIHN0aWxsIHNpbGVudGx5IHRy dW5jYXRlIGJ1dAo+ZGlkbid0IHRoZSBwcmV2aW91cyBgc3RybmNweWAgYWxzbyBkbyB0aGF0PwoK QWgsIGFjdHVhbGx5IHRoZXJlJ3Mgbm8gbmVlZCB0byBnZXQgdG9vIHRyaWNreSBoZXJlLiBUaGlz IHNob3VsZCBiZSBiZWhhdmlvcmFsbHkgaWRlbnRpY2FsOgoKbGVuID0gc3Ryc2NweShidWYsIGNt ZGxpbmUsIEFSUkFZX1NJWkUoYnVmKSk7CmlmIChsZW4gPT0gLUUyQklHKQogICAgbGVuID0gQVJS QVlfU0laRShidWYpIC0gMTsKCi1LZWVzCgoKLS0gCktlZXMgQ29vawoKX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5n IGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5p bmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=