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[201.92.183.102]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7e6db2c4845sm6869565a12.43.2024.09.30.13.08.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Sep 2024 13:08:46 -0700 (PDT) From: Adhemerval Zanella To: libc-alpha@sourceware.org Cc: Stephen Roettger , Jeff Xu , Florian Weimer , Mike Hommey , Adhemerval Zanella Subject: [PATCH v3 2/9] elf: Parse gnu properties for static linked binaries Date: Mon, 30 Sep 2024 17:08:24 -0300 Message-Id: <20240930200831.1669010-3-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240930200831.1669010-1-adhemerval.zanella@linaro.org> References: <20240930200831.1669010-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-10.9 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces~patch=linaro.org@sourceware.org So the static binary can opt-in of memory sealing. Checked on x86_64-linux-gnu. --- elf/dl-support.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/elf/dl-support.c b/elf/dl-support.c index 451932dd03..bd02a77d1a 100644 --- a/elf/dl-support.c +++ b/elf/dl-support.c @@ -45,6 +45,7 @@ #include #include #include +#include extern char *__progname; char **_dl_argv = &__progname; /* This is checked for some error messages. */ @@ -334,6 +335,18 @@ _dl_non_dynamic_init (void) _dl_main_map.l_relro_size = ph->p_memsz; break; } + /* Process program headers again, but scan them backwards so + that PT_NOTE can be skipped if PT_GNU_PROPERTY exits. */ + for (const ElfW(Phdr) *ph = &_dl_phdr[_dl_phnum]; ph != _dl_phdr; --ph) + switch (ph[-1].p_type) + { + case PT_NOTE: + _dl_process_pt_note (&_dl_main_map, -1, &ph[-1]); + break; + case PT_GNU_PROPERTY: + _dl_process_pt_gnu_property (&_dl_main_map, -1, &ph[-1]); + break; + } call_function_static_weak (_dl_find_object_init);