Messages in this thread | | | Date | Fri, 22 Aug 2003 16:25:30 -0300 | From | Alexandre Pereira Nunes <> | Subject | Doubt: core not dumped when binary give up root privileges. |
| |
Hi,
I wrote a program which runs with uid 0, but later give up root privs by calling setreuid(x, x) where x is an unprivileged user. Before doing that, it chdirs to a directory owned by that unprivileged user, with mode 700.
The program explicitly sets RLIMIT_CORE to RLIM_INFINITY when still running with uid 0.
If instead of calling the program as root, I call it from the non-priv uid in question, if it crashes, it dumps core on the mentioned dir. That's the desired behaviour, since I can then take the core and debug. But if I run it as root (in fact, I would have to), and it crashes (or is forced to ,by means of kill -SEGV), after it gives up root credentials, it won't leave a core dump file, which in turn means I cannot debug it later.
Any ideas?
Please CC-me since I'm not subscribed.
Thanks,
Alexandre
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |