Bug 467821

Created attachment 157597 [details]
Full trace of ksysguardd crash

SUMMARY

I'm using Plasma 5.27.3 on Wayland in a Fedora 38 KDE Plasma installation. I started ksysguard from ksysguard-5.22.0-8.fc38.x86_64. A crash notification appeared. gnome-abrt and coredumpctl showed that ksysguardd crashed repeatedly after starting ksysguard when lmSensors was being initalized. The function __GI___fortify_fail showed the error "buffer overflow detected" in frame 5 of the trace.

Core was generated by `/usr/bin/ksysguardd'.
Program terminated with signal SIGABRT, Aborted.
#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, 
    no_tid=no_tid@entry=0) at pthread_kill.c:44
44            return INTERNAL_SYSCALL_ERROR_P (ret) ? INTERNAL_SYSCALL_ERRNO (ret) : 0;
(gdb) bt
#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, 
    no_tid=no_tid@entry=0) at pthread_kill.c:44
#1  0x00007fd376a2bc03 in __pthread_kill_internal (signo=6, threadid=<optimized out>)
    at pthread_kill.c:78
#2  0x00007fd3769daaee in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#3  0x00007fd3769c387f in __GI_abort () at abort.c:79
#4  0x00007fd3769c460f in __libc_message (fmt=fmt@entry=0x7fd376b3f2e6 "*** %s ***: terminated\n")
    at ../sysdeps/posix/libc_fatal.c:150
#5  0x00007fd376abfb29 in __GI___fortify_fail (
    msg=msg@entry=0x7fd376b3f28c "buffer overflow detected") at fortify_fail.c:24
#6  0x00007fd376abe364 in __GI___chk_fail () at chk_fail.c:28
#7  0x00007fd376abdf45 in ___snprintf_chk (s=<optimized out>, maxlen=maxlen@entry=300, 
    flag=flag@entry=2, slen=slen@entry=36, format=format@entry=0x55ecb81b1f98 "lmsensors/%s/%s")
    at snprintf_chk.c:29
#8  0x000055ecb81a88d6 in snprintf (__fmt=0x55ecb81b1f98 "lmsensors/%s/%s", __n=300, 
    __s=<optimized out>) at /usr/include/bits/stdio2.h:54
#9  initLmSensors (sm=0x55ecb81b8190 <SensorModulList+336>)
    at /usr/src/debug/ksysguard-5.22.0-8.fc38.x86_64/ksysguardd/Linux/lmsensors.c:170
#10 0x000055ecb8195319 in initModules ()
    at /usr/src/debug/ksysguard-5.22.0-8.fc38.x86_64/ksysguardd/ksysguardd.c:467
#11 main (argc=<optimized out>, argv=<optimized out>)
    at /usr/src/debug/ksysguard-5.22.0-8.fc38.x86_64/ksysguardd/ksysguardd.c:558

The crash happened 264 times according to coredumpctl. I'm attaching the full trace.

STEPS TO REPRODUCE
1. Boot a Fedora 38 KDE Plasma installation updated to 2023-3-26 with the updates-testing repo enabled
2. Log in to Plasma on Wayland
3. Start ksysguard

OBSERVED RESULT
ksysguardd crashed repeatedly after starting ksysguard with a buffer overflow detected

EXPECTED RESULT
No crashes would happen.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 38
(available in About System)
KDE Plasma Version: 5.27.3
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8

ADDITIONAL INFORMATION

Fedora 38 involved a change to use the build flag _FORTIFY_SOURCE=3  https://fedoraproject.org/wiki/Changes/Add_FORTIFY_SOURCE%3D3_to_distribution_build_flags That change might be involved in the buffer overflow being detected. This problem appears to have been reported at https://bugzilla.redhat.com/show_bug.cgi?id=2179990