On Thursday 11 December 2008 15:00, Tino Keitel wrote:
> Here is the test program:
>
> #include <unistd.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <fcntl.h>
> #include <stdio.h>
>
> int main() {
> mknod("foobar", S_IFCHR|0666, makedev(10,63));
> return 0;
> }
>
> $ strace ./test_static
> execve("./test_static", ["./test_static"], [/* 18 vars */]) = 0
> mknod("foobar", S_IFCHR|0666, makedev(10, 63)) = 0
> _exit(0)
>
> So this works as it should. I added a puts("foobar"); after the
> mknod(), and this broke:
>
> $ strace ./test_static_stdio_puts
> execve("./test_static_stdio_puts", ["./test_static_stdio_puts"], [/* 18
> vars */]) = 0
> ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo
> ...}) = 0
> ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo
> ...}) = 0
> mknod("foobar", S_IFCHR|01001000666, makedev(4294965514, 4294967103)) =
> 0
> write(1, "foobar\n"..., 7foobar
> ) = 7
You have buggy strace. Not only it prints "..." even after non-truncated
strings, it does it without allocating enough memory for it,
corrupting memory. Upgrade it to fixed version.
> Here is the assembly of the broken version:
>
> .file "test.c"
> .section .rodata
> .LC0:
> .string "foobar"
> .text
> .globl main
> .type main, @function
> main:
> leal 4(%esp), %ecx
> andl $-16, %esp
> pushl -4(%ecx)
...
Please also send assembly of non-broken version
(one without puts), and also your uclibc .config.
--
vda
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