https://qa.mandrakesoft.com/show_bug.cgi?id=602
Product: glibc
Component: glibc
Summary: ld-linux.so.2 binds sys_errlist to sys_errno
Version: 2.2.5-16mdk
Platform: PC
OS/Version: All
Status: UNCONFIRMED
Severity: normal
Priority: P2
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Sytem is installed from "Mandrake Linux release 9.0 (dolphin)" CDs
Expected output:
sys_errlist[2]: No such file or directory
Current output:
bogus sys_errlist
Details:
$ cat main.c
int main()
{
return test();
}
$ cat junk2.c
#include <stdio.h>
test()
{
const char *s = sys_errlist[2];
if (s) {
printf("sys_errlist[2]: %s\n", s);
} else {
fprintf(stderr, "bogus sys_errlist\n");
return 1;
}
return 0;
}
$ gcc -g -c -fPIC junk2.c
$ ld -shared -o junk2.so junk2.o
$ gcc -g main.c ./junk2.so
$ ./a.out
bogus sys_errlist
$ gdb a.out
GNU gdb 5.2.1-2mdk (Mandrake Linux)
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i586-mandrake-linux-gnu"...
(gdb) b main
Breakpoint 1 at 0x80484a6: file main.c, line 3.
(gdb) r
Breakpoint 1, main () at main.c:3
3 return test();
(gdb) step
test () at junk2.c:5
5 const char *s = sys_errlist[2];
(gdb) x/10i $pc
0x400133c6 <test+18>: mov 0x14(%ebx),%eax
0x400133cc <test+24>: mov 0x8(%eax),%edx
0x400133cf <test+27>: mov %edx,0xfffffffc(%ebp)
0x400133d2 <test+30>: cmpl $0x0,0xfffffffc(%ebp)
0x400133d6 <test+34>: je 0x400133f2 <test+62>
0x400133d8 <test+36>: add $0xfffffff8,%esp
0x400133db <test+39>: mov 0xfffffffc(%ebp),%eax
0x400133de <test+42>: push %eax
0x400133df <test+43>: lea 0xffffef47(%ebx),%edx
0x400133e5 <test+49>: mov %edx,%eax
(gdb) stepi
(gdb) p/a $eax
$1 = 0x4013c0e0 <sys_siglist>
(gdb) ### should have been sys_errlist !!!
(gdb) n
6 if (s) {
(gdb) p s
$2 = 0x0
(gdb) p &sys_errlist
$4 = (<data variable, no debug info> *) 0x4013eb60
(gdb) x/3x 0x4013eb60
0x4013eb60 <sys_errlist>: 0x401369d3 0x401369db 0x401369f3
(gdb) x/s 0x401369f3
0x401369f3 <in6addr_loopback+8011>: "No such file or directory"
(gdb) c
bogus sys_errlist
Program exited with code 01.
(gdb) quit
Workaround: relinking junk2.so with '-lc' magically cures the bug:
$ ld -shared -o junk2.so junk2.o -lc
$ ./a.out
sys_errlist[2]: No such file or directory
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