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libc0.3: TIOCFLUSH ioctl segfaults

From: Robert Millan
Subject: libc0.3: TIOCFLUSH ioctl segfaults
Date: Wed, 19 Mar 2003 02:05:26 +0100
User-agent: Mutt/1.5.3i

Package: libc0.3
Severity: normal

TIOCFLUSH ioctl causes segfault:

$ cat test.c
#include <sys/ioctl.h>
#include <fcntl.h>
main () {ioctl (open("/tmp/file", O_CREAT|O_RDONLY|O_WRONLY), TIOCFLUSH, 0);}
$ gcc -g test.c -o test
$ LD_LIBRARY_PATH=/lib/debug gdb ./test
(gdb) r
Starting program: /tmp/test
Program received signal SIGSEGV, Segmentation fault.
0x010b57e9 in __mempcpy (dstpp=0x1017aac, srcpp=0x0, len=4)
    at ../sysdeps/generic/mempcpy.c:63
63      ../sysdeps/generic/mempcpy.c: No such file or directory.
        in ../sysdeps/generic/mempcpy.c
(gdb) bt
#0  0x010b57e9 in __mempcpy (dstpp=0x1017aac, srcpp=0x0, len=4)
    at ../sysdeps/generic/mempcpy.c:63
#1  0x0111a94e in in (count=1, type=IOC_32) at ../sysdeps/mach/hurd/ioctl.c:117
#2  0x0111a9bc in send_rpc.0 () at ../sysdeps/mach/hurd/ioctl.c:129
#3  0x010584cf in _hurd_ctty_output (port=72, ctty=0, rpc=0x1017b10)
    at ctty-output.c:50
#4  0x0111b2d9 in __ioctl () at ../sysdeps/mach/hurd/ioctl.c:257
#5  0x0804848e in main () at test.c:6
#6  0x0105a5bf in __libc_start_main (main=0x804845c <main>, argc=1,
    ubp_av=0x1017c14, init=0x8048354 <_init>, fini=0x80484b8 <_fini>,
    rtld_fini=0x4, stack_end=0x10012002) at ../sysdeps/generic/libc-start.c:144
(gdb) q

Robert Millan

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