Bug#776891: libc6-dev: time_t time(time_t *t) behavior does not conform to specification
* What led up to the situation?
I was writing some short simple example code to demonstrate error handling in
a UNIX environment. I attempted to purposely produce an error by calling the
`time` function with a bad parameter.
* What exactly did you do (or not do) that was effective (or
I compiled a program with gcc containing this simple code snippet and ran it:
time_t *ptr = (time_t *) 0xabad1dea;
time_t secs = time(ptr);
if (secs == ((time_t) -1)) /* Not caught */
printf("Number of seconds since the Epoch: %lld\n", secs);
printf("It should return ((time_t) -1) on error: %lld\n", (time_t) -1);
secs = *ptr; /* This *does* segfault */
* What was the outcome of this action?
The error condition was not caught. `time` returned -14 when passed
an out-of-bounds address and did not set `errno`.
* What outcome did you expect instead?
The manual (`man 2 time`), POSIX, and the C standard lead me to believe that
time should return -1 and set errno to EFAULT (14). The of the function in
this version of libc is incorrect. I thought someone should know, since this
is sort of a confusing glibc bug.
-- System Information:
Debian Release: 7.6
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable'), (100, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 3.2.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages libc6-dev depends on:
ii libc-dev-bin 2.13-38+deb7u3
ii libc6 2.13-38+deb7u3
ii linux-libc-dev 3.2.60-1+deb7u3
Versions of packages libc6-dev recommends:
ii gcc [c-compiler] 4:4.7.2-1
ii gcc-4.6 [c-compiler] 4.6.3-14
ii gcc-4.7 [c-compiler] 4.7.2-5
Versions of packages libc6-dev suggests:
pn glibc-doc <none>
ii manpages-dev 3.44-1
-- no debconf information