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Message-ID: <532D87B3.8050001@opensource.dyc.edu>
Date: Sat, 22 Mar 2014 08:53:07 -0400
From: "Anthony G. Basile" <basile@...nsource.dyc.edu>
To: musl@...ts.openwall.com
Subject: i686 with -fPIE and -fstack-protector-all
Hi,
I've hit a bug with 1.0.0 on i686. When building with
-fstack-protector-all and -fPIE, I get an undefined reference to
`__stack_chk_fail_local'. I do not get this on x86_64:
i686:
i686-musl-vanilla ~ # gcc -fstack-protector-all -fPIE -o test test.c
/tmp/ccmdheAK.o: In function `main':
test.c:(.text+0x28): undefined reference to `__stack_chk_fail_local'
/usr/lib/gcc/i686-gentoo-linux-musl/4.7.3/../../../../i686-gentoo-linux-musl/bin/ld:
test: hidden symbol `__stack_chk_fail_local' isn't defined
/usr/lib/gcc/i686-gentoo-linux-musl/4.7.3/../../../../i686-gentoo-linux-musl/bin/ld:
final link failed: Bad value
collect2: error: ld returned 1 exit status
i686-musl-vanilla ~ # gcc -fstack-protector-all -o test test.c
i686-musl-vanilla ~ # gcc -fPIE -o test test.c
By contrast for amd64:
amd64-musl-vanilla ~ # echo "int main() { ; return 0 ; }" > test.c
amd64-musl-vanilla ~ # gcc -fstack-protector-all -fPIE -o test test.c
amd64-musl-vanilla ~ # gcc -fstack-protector-all -o test test.c
amd64-musl-vanilla ~ # gcc -fPIE -o test test.c
Doing a compile without link and checking the symbols confirms the problem:
i686-musl-vanilla ~ # gcc -fstack-protector-all -fPIE -c test.c
i686-musl-vanilla ~ # readelf -sW test.o | grep stack
9: 00000000 0 NOTYPE GLOBAL HIDDEN UND __stack_chk_fail_local
amd64-musl-vanilla ~ # gcc -fstack-protector-all -fPIE -c test.c
amd64-musl-vanilla ~ # readelf -sW test.o | grep stack
10: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND __stack_chk_fail
This is obviously how the compiler spits things out and we have the
exact same symbols (__stack_chk_fail on amd64 and __stack_chk_fail_local
on i686) irrespective of the c library.
Where is __stack_chk_fail_local resolved?
--
Anthony G. Basile, Ph. D.
Chair of Information Technology
D'Youville College
Buffalo, NY 14201
(716) 829-8197
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