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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id e2sm3424685pfm.37.2020.08.21.12.54.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Aug 2020 12:54:02 -0700 (PDT) From: Kees Cook To: Ingo Molnar Subject: [PATCH v6 26/29] x86/boot/compressed: Reorganize zero-size section asserts Date: Fri, 21 Aug 2020 12:43:07 -0700 Message-Id: <20200821194310.3089815-27-keescook@chromium.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200821194310.3089815-1-keescook@chromium.org> References: <20200821194310.3089815-1-keescook@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200821_155406_916489_CF197FCC X-CRM114-Status: GOOD ( 14.41 ) 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, Kees Cook , Arnd Bergmann , Catalin Marinas , Masahiro Yamada , x86@kernel.org, Nick Desaulniers , Russell King , linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Arvind Sankar , Ingo Molnar , James Morse , Nathan Chancellor , Borislav Petkov , Peter Collingbourne , Ard Biesheuvel , 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 For readability, move the zero-sized sections to the end after DISCARDS. Signed-off-by: Kees Cook --- arch/x86/boot/compressed/vmlinux.lds.S | 44 +++++++++++++++----------- 1 file changed, 26 insertions(+), 18 deletions(-) diff --git a/arch/x86/boot/compressed/vmlinux.lds.S b/arch/x86/boot/compressed/vmlinux.lds.S index 3c2ee9a5bf43..ca544a16724b 100644 --- a/arch/x86/boot/compressed/vmlinux.lds.S +++ b/arch/x86/boot/compressed/vmlinux.lds.S @@ -42,19 +42,6 @@ SECTIONS *(.rodata.*) _erodata = . ; } - .rel.dyn : { - *(.rel.*) - } - .rela.dyn : { - *(.rela.*) - } - .got : { - *(.got) - } - .got.plt : { - *(.got.plt) - } - .data : { _data = . ; *(.data) @@ -85,13 +72,34 @@ SECTIONS ELF_DETAILS DISCARDS -} -ASSERT(SIZEOF(.got) == 0, "Unexpected GOT entries detected!") + .got.plt (INFO) : { + *(.got.plt) + } + ASSERT(SIZEOF(.got.plt) == 0 || #ifdef CONFIG_X86_64 -ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, "Unexpected GOT/PLT entries detected!") + SIZEOF(.got.plt) == 0x18, #else -ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0xc, "Unexpected GOT/PLT entries detected!") + SIZEOF(.got.plt) == 0xc, #endif + "Unexpected GOT/PLT entries detected!") + + /* + * Sections that should stay zero sized, which is safer to + * explicitly check instead of blindly discarding. + */ + .got : { + *(.got) + } + ASSERT(SIZEOF(.got) == 0, "Unexpected GOT entries detected!") + + .rel.dyn : { + *(.rel.*) + } + ASSERT(SIZEOF(.rel.dyn) == 0, "Unexpected run-time relocations (.rel) detected!") -ASSERT(SIZEOF(.rel.dyn) == 0 && SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations detected!") + .rela.dyn : { + *(.rela.*) + } + ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!") +} -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel