Bug 134546
| Summary: | breaks dietlibc signal-handling | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Enrico Scholz <rh-bugzilla> |
| Component: | dietlibc | Assignee: | Jeremy Katz <katzj> |
| Status: | CLOSED RAWHIDE | QA Contact: | Brian Brock <bbrock> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 2 | CC: | davej, mingo, wtogami |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2006-04-24 18:11:31 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
dietlibc is miscompiled I suspect; it needs to indicate in the elf flags that it requires executable stack. it happens also when the program is compiled with | diet gcc x.c -Wl,-z -Wl,execstack or with LD_ASSUME_KERNEL=2.2.5. Fixed in dietlibc-0.27-3. Added i386 sigaction code very similar to the x86_64 sigaction code (basically, ensuring that the restorer is set to sigreturn) Mass-closing lots of old bugs which are in MODIFIED (and thus presumed to be fixed). If any of these are still a problem, please reopen or file a new bug against the release which they're occurring in so they can be properly tracked. |
Description of problem: The fedora kernel seems to break signal-handling with dietlibc. E.g. the following trivial program causes a segfault: ------ #include <sys/signal.h> void handler(int s) {} int main() { signal(SIGUSR1, handler); kill(getpid(), SIGUSR1); } ------ | $ diet gcc test.c | $ strace ./a.out | execve("./a.out", ["./a.out"], [/* 26 vars */]) = 0 | rt_sigaction(SIGUSR1, {0x80480d4, [USR1], SA_NOMASK}, {SIG_DFL}, 8) = 0 | getpid() = 31173 | kill(31173, SIGUSR1) = 0 | --- SIGUSR1 (User defined signal 1) @ 0 (0) --- | --- SIGSEGV (Segmentation fault) @ 0 (0) --- | +++ killed by SIGSEGV +++ This issue is caused by the fedora kernel; with a vanilla 2.6.8.1 kernel or 2.4.27 things are fine: | $ strace ./a.out | execve("./a.out", ["./a.out"], [/* 37 vars */]) = 0 | rt_sigaction(SIGUSR1, {0x80480d4, [USR1], SA_NOMASK}, {SIG_DFL}, 8) = 0 | getpid() = 1366 | kill(1366, SIGUSR1) = 0 | --- SIGUSR1 (User defined signal 1) @ 0 (0) --- | sigreturn() = ? (mask now []) | _exit(0) = ? Version-Release number of selected component (if applicable): kernel-2.6.8-1.521 dietlibc-0.24-4 How reproducible: 100%