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McKenney" , Boqun Feng , Will Deacon , Dave Watson , Paul Turner , Rich Felker , linux-kernel , linux-api Message-ID: <1190407525.3131.1560516910936.JavaMail.zimbra@efficios.com> In-Reply-To: <87tvcsv1pk.fsf@oldenburg2.str.redhat.com> References: <20190503184219.19266-1-mathieu.desnoyers@efficios.com> <87wohzorj0.fsf@oldenburg2.str.redhat.com> <914051741.43025.1560348011775.JavaMail.zimbra@efficios.com> <802638054.3032.1560506584705.JavaMail.zimbra@efficios.com> <87ftocwkei.fsf@oldenburg2.str.redhat.com> <1635690189.3049.1560507249693.JavaMail.zimbra@efficios.com> <87tvcsv1pk.fsf@oldenburg2.str.redhat.com> Subject: Re: [PATCH 1/5] glibc: Perform rseq(2) registration at C startup and thread creation (v10) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Originating-IP: [167.114.142.138] X-Mailer: Zimbra 8.8.12_GA_3803 (ZimbraWebClient - FF67 (Linux)/8.8.12_GA_3794) Thread-Topic: glibc: Perform rseq(2) registration at C startup and thread creation (v10) Thread-Index: nxhND8m/7T2GVm9h2nQ+6XKFJSEm7Q== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ----- On Jun 14, 2019, at 1:35 PM, Florian Weimer fweimer@redhat.com wrote: > * Mathieu Desnoyers: > >> * Makefile: >> >> LIBCPATH=/home/efficios/glibc-test/lib >> KERNEL_HEADERS=/home/efficios/git/linux-percpu-dev/usr/include >> CFLAGS=-I${KERNEL_HEADERS} -L${LIBCPATH} -Wl,--rpath=${LIBCPATH} >> -Wl,--dynamic-linker=${LIBCPATH}/ld-linux-x86-64.so.2 >> >> all: >> gcc ${CFLAGS} -o a a.c >> gcc ${CFLAGS} -shared -fPIC -o s.so s.c > > For me, that does not correctly link against the built libc because the > system dynamic loader seeps into the link. I have the same issue. I tried adding "-B${LIBCPATH}" as well, but it did not seem to help. I still have this ldd output: ldd a ./a: /lib64/ld-linux-x86-64.so.2: version `GLIBC_2.30' not found (required by ./a) linux-vdso.so.1 (0x00007fffaa7e9000) libc.so.6 => /home/efficios/glibc-test/lib/libc.so.6 (0x00007fac5d479000) /home/efficios/glibc-test/lib/ld-linux-x86-64.so.2 => /lib64/ld-linux-x86-64.so.2 (0x00007fac5da33000) Still no luck there. Any idea what compiler/linker flag I am missing ? > >> specifically this commit: >> https://github.com/compudj/glibc-dev/commit/c49a286497d065a7fc00aafd846e6edce14f97fc > > This commit links __rseq_handled into libc.so.6 via rseq-sym.c, but does > not export it from there. Moving __rseq_handled to elf/dl-support.c and elf/rtld.c was part a commit on top. I've force-pushed on the dev branch, and the commit moving __rseq_handled to the dynamic linker it now appears as: https://github.com/compudj/glibc-dev/commit/f0d4e60e5d0ceb0c2642f99da5af61b6ad988531 Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com