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authorKevin Cernekee <cernekee@gmail.com>2011-07-24 01:19:13 -0700
committerCarmelo Amoroso <carmelo.amoroso@st.com>2011-07-27 09:40:24 +0200
commita2f827c7c28c955ad49b32909452e42ccfc5e5c1 (patch)
tree6da4313f89a4308e1c7ee1151a92ab210301d954 /README
parent2d4243ce60bcd7a9f64c2ce670bc456f2c7da708 (diff)
ldso/mips: dlsym() incorrectly matches undefined symbols
check_match() relies on checking for (sym->st_value == 0) to see if the symbol is undefined. This works reasonably well on most architectures, such as ARM or i386: $ readelf -s /lib32/libcap.so.2 | grep -E "\<malloc\>" 17: 00000000 0 FUNC GLOBAL DEFAULT UND malloc@GLIBC_2.0 (2) However, on MIPS, libbfd puts nonzero data in the st_value field to facilitate resetting the symbol's GOT entry if the library that defines the symbol gets unloaded: $ mipsel-linux-readelf -s libfoo.so | grep -E "\<malloc\>" 74: 00003140 0 FUNC GLOBAL DEFAULT UND malloc This can cause check_match to report a false positive when examining the external symbol reference. Consequently dlsym() will return a bad pointer to the caller. Use the special MIPS logic from glibc-ports-2.13 to avoid this situation. Signed-off-by: Kevin Cernekee <cernekee@gmail.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
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