Here is my test code.
#include <sys/types.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
int main(int ac, char **av)
{
int test;
char *path = "/tmp/stat01"; // I have created stat01 before
test = stat(path, -1);
printf("stat=%d\n", test);
return 0;
}
Then I use strace to trace it.
...
ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
{B115200 opost isig icanon echo ...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
{B115200 opost isig icanon echo ...}) = 0
stat64("/tmp/stat01", {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0xffffffff} --- //
This is the segmentfault
+++ killed by SIGSEGV +++
sh-4.2#
Here is uclibc code.
int stat(const char *file_name, struct stat *buf)
{
int result;
# ifdef __NR_stat64
/* normal stat call has limited values for various stat elements
* e.g. uid device major/minor etc.
* so we use 64 variant if available
* in order to get newer versions of stat elements
*/
struct kernel_stat64 kbuf;
result = INLINE_SYSCALL(stat64, 2, file_name, &kbuf); // return success
if (result == 0) {
__xstat32_conv(&kbuf, buf); // memset address(-1) cause the
segmentfault
}
# else
struct kernel_stat kbuf;
result = INLINE_SYSCALL(stat, 2, file_name, &kbuf);
if (result == 0) {
__xstat_conv(&kbuf, buf);
}
# endif /* __NR_stat64 */
return result;
}
#endif /* __NR_fstat64 */
libc_hidden_def(stat)
Is this a bug or we should not pass a invalid parameter to stat()?
Thanks,
Xishi Qiu
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