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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id m22sm2843446pja.36.2020.08.21.14.21.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Aug 2020 14:21:35 -0700 (PDT) Date: Fri, 21 Aug 2020 14:21:34 -0700 From: Kees Cook To: Arvind Sankar Subject: Re: [PATCH v6 27/29] x86/boot/compressed: Remove, discard, or assert for unwanted sections Message-ID: <202008211421.47347CA42@keescook> References: <20200821194310.3089815-1-keescook@chromium.org> <20200821194310.3089815-28-keescook@chromium.org> <20200821200159.GC1475504@rani.riverdale.lan> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200821200159.GC1475504@rani.riverdale.lan> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200821_172143_335835_EA6F0CB3 X-CRM114-Status: GOOD ( 15.58 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , linux-arch@vger.kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, Arnd Bergmann , Catalin Marinas , Masahiro Yamada , x86@kernel.org, Nick Desaulniers , Russell King , Ard Biesheuvel , clang-built-linux@googlegroups.com, Ingo Molnar , James Morse , Nathan Chancellor , Borislav Petkov , Peter Collingbourne , Ingo Molnar , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Aug 21, 2020 at 04:01:59PM -0400, Arvind Sankar wrote: > On Fri, Aug 21, 2020 at 12:43:08PM -0700, Kees Cook wrote: > > In preparation for warning on orphan sections, stop the linker from > > generating the .eh_frame* sections, discard unwanted non-zero-sized > > generated sections, and enforce other expected-to-be-zero-sized sections > > (since discarding them might hide problems with them suddenly gaining > > unexpected entries). > > > > Signed-off-by: Kees Cook > > .rel.dyn : { > > - *(.rel.*) > > + *(.rel.*) *(.rel_*) > > } > > ASSERT(SIZEOF(.rel.dyn) == 0, "Unexpected run-time relocations (.rel) detected!") > > > > .rela.dyn : { > > - *(.rela.*) > > + *(.rela.*) *(.rela_*) > > } > > ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!") > > } > > -- > > 2.25.1 > > > > When do you get .rela_? i386 builds, IIRC. I can try to hunt that down if you want? -- Kees Cook _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel