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[Bug dynamic-link/14370] SIGFPE in 'ldd -r'
- From: "hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Sun, 02 Sep 2012 20:00:15 +0000
- Subject: [Bug dynamic-link/14370] SIGFPE in 'ldd -r'
- Auto-submitted: auto-generated
- References: <bug-14370-131@http.sourceware.org/bugzilla/>
http://sourceware.org/bugzilla/show_bug.cgi?id=14370
--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> 2012-09-02 20:00:15 UTC ---
(In reply to comment #0)
> Created attachment 6536 [details]
> testcase
>
> $ ldd -r SceMiDpiBridge.so
> linux-gate.so.1 (0xf76eb000)
> libsds_server.so => not found
> libxtor_threads_boost.so => not found
> libaldecpli.so => not found
> libsvdpi_exp.so => not found
> libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xf755e000)
> libsce_mi.so => not found
> libScemiDpiBridgeApi.so => not found
> libm.so.6 => /lib/libm.so.6 (0xf7520000)
> libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xf7505000)
> librt.so.1 => /lib/librt.so.1 (0xf74fb000)
> libc.so.6 => /lib/libc.so.6 (0xf735b000)
> /lib/ld-linux.so.2 (0xf76ec000)
> libpthread.so.0 => /lib/libpthread.so.0 (0xf7340000)
> Floating point exception
This DSO is bad in several ways:
[hjl@gnu-6 pr14370]$ readelf -d pr14370.so
Dynamic section at offset 0x953e0 contains 29 entries:
Tag Type Name/Value
0x00000001 (NEEDED) Shared library: [libsds_server.so]
0x00000001 (NEEDED) Shared library:
[libxtor_threads_boost.so]
0x00000001 (NEEDED) Shared library: [libaldecpli.so]
0x00000001 (NEEDED) Shared library: [libsvdpi_exp.so]
0x00000001 (NEEDED) Shared library: [libstdc++.so.6]
0x00000001 (NEEDED) Shared library: [libsce_mi.so]
0x00000001 (NEEDED) Shared library:
[libScemiDpiBridgeApi.so]
0x00000001 (NEEDED) Shared library: [libm.so.6]
0x00000001 (NEEDED) Shared library: [libgcc_s.so.1]
0x0000000c (INIT) 0x1de28
0x0000000d (FINI) 0x794d4
0x00000004 (HASH) 0xd4
0x00000005 (STRTAB) 0x6558
0x00000006 (SYMTAB) 0x21d8
0x0000000a (STRSZ) 15815 (bytes)
0x0000000b (SYMENT) 16 (bytes)
0x00000003 (PLTGOT) 0x955c0
0x00000002 (PLTRELSZ) 856 (bytes)
0x00000014 (PLTREL) REL
0x00000017 (JMPREL) 0x1dad0
0x00000011 (REL) 0xabf0
0x00000012 (RELSZ) 77536 (bytes)
0x00000013 (RELENT) 8 (bytes)
0x00000016 (TEXTREL) 0x0
0x6ffffffe (VERNEED) 0xab90
0x6fffffff (VERNEEDNUM) 2
0x6ffffff0 (VERSYM) 0xa320
0x6ffffffa (RELCOUNT) 3970
0x00000000 (NULL) 0x0
[hjl@gnu-6 pr14370]$ readelf -sWr pr14370.so | grep errno | tail -5
00078dcc 0003a502 R_386_PC32 00033110 __errno_location
00033120 0000ad01 R_386_32 00097254 errno
173: 00097254 4 OBJECT GLOBAL DEFAULT 27 errno
933: 00033110 37 FUNC WEAK DEFAULT 10 __errno_location
959: 00097254 4 OBJECT GLOBAL DEFAULT 27 _errno
[hjl@gnu-6 pr14370]$
1. It wasn't compiled with -fPIC.
2. It wasn't linked against libc.so.
3. It defines errno as int.
A testcase:
[hjl@gnu-6 pr14370]$ cat x.c
int errno = 3;
extern void foo (void);
int
bar (void)
{
foo ();
return errno;
}
[hjl@gnu-6 pr14370]$ cat foo.c
void
foo (void)
{
}
[hjl@gnu-6 pr14370]$ gcc -m32 -shared -o libm.so.6 foo.c -fPIC
[hjl@gnu-6 pr14370]$ gcc -m32 x.c -c
[hjl@gnu-6 pr14370]$ ld -m elf_i386 -shared x.o libm.so.6
[hjl@gnu-6 pr14370]$ ldd -r a.out
linux-gate.so.1 => (0xf7ffd000)
libm.so.6 => /lib/libm.so.6 (0xf7fad000)
/lib/ld-linux.so.2 (0x56555000)
libc.so.6 => /lib/libc.so.6 (0xf7dfb000)
/usr/local/bin/ldd: line 118: 17528 Floating point
exceptionLD_TRACE_LOADED_OBJECTS=1 LD_WARN=yes LD_BIND_NOW=yes
LD_LIBRARY_VERSION=$verify_out LD_VERBOSE= "$@"
[hjl@gnu-6 pr14370]$
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