I noticed a systematic segfault of tracker-extract on my fedora 24 box, while working on a djvu file. I found that this crash is related to the newly added seccomp sandboxing feature.
Would it make sense to merge some upstream patches that whitelist supplementary syscall. Taken from master, I identified these patches :
47b4958 libtracker-common: Allow querying process stats/limits
c9acfe0 libtracker-common: Handle mlock*/munlock* syscalls
73f5cd5 libtracker-common: Whitelist umask
435eca3 libtracker-common: Whitelist dup/dup2/dup3
88cfdc5 libtracker-common: Whitelist gettimeofday() syscall
2860120 libtracker-common: Whitelist clock_gettime/getres
fff1ba0 libtracker-common: Whitelist more syscalls used on non-x86_64 arches
14f77ae libtracker-common: Whitelist *64() stat/getdents syscalls
F24 (version 1.8.3) can add the first 5 patches
F25 (version 1.10.3) can add the first 5 patches too
devel (version 1.11.2) can add the 8 patches
For information, the crash on djvu files comes from the missing getrusage syscall:
#0 0x00007ffff1a07777 in getrusage () at ../sysdeps/unix/syscall-template.S:84
#1 0x00007fffc065be30 in _rnd_get_event (e=e@entry=0x7fffd55d70b0) at rnd-common.c:68
#2 0x00007fffc065c3fa in wrap_nettle_rnd_init (ctx=<optimized out>) at rnd.c:230
#3 0x00007fffc05bdcc9 in _gnutls_rnd_init () at random.c:49
#4 0x00007fffc05b17ce in gnutls_global_init () at gnutls_global.c:296
#5 0x00007fffc0592a3c in lib_init () at gnutls_global.c:483
#6 0x00007ffff7de8daa in call_init (l=<optimized out>, argc=argc@entry=3, argv=argv@entry=0x7fffffffde08, env=env@entry=0x55555579d200) at dl-init.c:72
#7 0x00007ffff7de8ebb in call_init (env=0x55555579d200, argv=0x7fffffffde08, argc=3, l=<optimized out>) at dl-init.c:30
#8 _dl_init (main_map=main_map@entry=0x7fffc801e0e0, argc=3, argv=0x7fffffffde08, env=0x55555579d200) at dl-init.c:120
#9 0x00007ffff7dedab1 in dl_open_worker (a=a@entry=0x7fffd55d7640) at dl-open.c:564
#10 0x00007ffff7de8c54 in _dl_catch_error (objname=objname@entry=0x7fffd55d7630, errstring=errstring@entry=0x7fffd55d7638, mallocedp=mallocedp@entry=0x7fffd55d762f, operate=operate@entry=0x7ffff7ded660 <dl_open_worker>, args=args@entry=0x7fffd55d7640) at dl-error.c:187
#11 0x00007ffff7ded009 in _dl_open (file=0x7fffc806c3d0 "/usr/lib64/gstreamer-1.0/libgstlibav.so", mode=-2147483646, caller_dlopen=0x7ffff2f14801 <g_module_open+705>, nsid=-2, argc=<optimized out>, argv=<optimized out>, env=0x55555579d200) at dl-open.c:649
#12 0x00007ffff06f9f09 in dlopen_doit (a=a@entry=0x7fffd55d7870) at dlopen.c:66
#13 0x00007ffff7de8c54 in _dl_catch_error (objname=0x7fffc8002e10, errstring=0x7fffc8002e18, mallocedp=0x7fffc8002e08, operate=0x7ffff06f9eb0 <dlopen_doit>, args=0x7fffd55d7870) at dl-error.c:187
#14 0x00007ffff06fa591 in _dlerror_run (operate=operate@entry=0x7ffff06f9eb0 <dlopen_doit>, args=args@entry=0x7fffd55d7870) at dlerror.c:163
#15 0x00007ffff06f9fa2 in __dlopen (file=file@entry=0x7fffc806c3d0 "/usr/lib64/gstreamer-1.0/libgstlibav.so", mode=<optimized out>) at dlopen.c:87
#16 0x00007ffff2f14801 in _g_module_open (bind_local=<optimized out>, bind_lazy=0, file_name=<optimized out>) at gmodule-dl.c:97
#17 g_module_open (file_name=file_name@entry=0x7fffc40c67a0 "/usr/lib64/gstreamer-1.0/libgstlibav.so", flags=<optimized out>) at gmodule.c:573
#18 0x00007fffd6ccd5cd in _priv_gst_plugin_load_file_for_registry (filename=0x7fffc40c67a0 "/usr/lib64/gstreamer-1.0/libgstlibav.so", registry=0x5555558d3f50, registry@entry=0x0, error=error@entry=0x7fffd55d7ad0) at gstplugin.c:745
#19 0x00007fffd6ccdfca in gst_plugin_load_file (filename=<optimized out>, error=error@entry=0x7fffd55d7ad0) at gstplugin.c:680
#20 0x00007fffd6cce40a in gst_plugin_load_by_name (name=0x7fffc40c3ea0 "libav") at gstplugin.c:1265
#21 0x00007fffd6cced8e in gst_plugin_feature_load (feature=feature@entry=0x7fffc414ab00) at gstpluginfeature.c:111
#22 0x00007fffd6cf4b13 in gst_type_find_factory_call_function (factory=0x7fffc414ab00, find=0x7fffd55d7bb0) at gsttypefindfactory.c:210
#23 0x00007fffd6a334b1 in gst_type_find_helper_get_range (obj=obj@entry=0x7fffc421a3b0, parent=<optimized out>, func=<optimized out>, size=<optimized out>, extension=extension@entry=0x7fffc80010c0 "djvu", prob=prob@entry=0x7fffd55d7c44) at gsttypefindhelper.c:355
#24 0x00007fffd5615ac0 in gst_type_find_element_loop (pad=0x7fffc4212720) at gsttypefindelement.c:1132
#25 0x00007fffd6cf0181 in gst_task_func (task=0x7fffc4220050) at gsttask.c:332
#26 0x00007ffff25d06ee in g_thread_pool_thread_proxy (data=<optimized out>) at gthreadpool.c:307
#27 0x00007ffff25cfcf5 in g_thread_proxy (data=0x7fffc420ff70) at gthread.c:780
#28 0x00007ffff1cd85ca in start_thread (arg=0x7fffd55d8700) at pthread_create.c:333
#29 0x00007ffff1a120ed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
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