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Bug 290249 - sys-apps/sandbox deadlocks if other library interposes mmap() and calls open() in it
Summary: sys-apps/sandbox deadlocks if other library interposes mmap() and calls open(...
Status: RESOLVED NEEDINFO
Alias: None
Product: Portage Development
Classification: Unclassified
Component: Sandbox (show other bugs)
Hardware: All Linux
: High normal
Assignee: Sandbox Maintainers
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2009-10-23 15:04 UTC by Diego Elio Pettenò (RETIRED)
Modified: 2012-06-23 02:59 UTC (History)
0 users

See Also:
Package list:
Runtime testing required: ---

Attachments
libsandbox-mmap.patch (libsandbox-mmap.patch,1.90 KB, patch)
2009-10-25 08:59 UTC, SpanKY 		Details | Diff
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Description Diego Elio Pettenò (RETIRED) gentoo-dev 2009-10-23 15:04:33 UTC 
As I told Mike before, when testing a library that interposes mmap() and calls open() in it (such as dev-util/google-perftools), sandbox deadlocks:

(gdb) bt
#0  __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:136
#1  0x00002ac1d3aa8ed5 in _L_lock_941 () from /lib/libpthread.so.0
#2  0x00002ac1d3aa8cf8 in __pthread_mutex_lock (mutex=0x2ac1d33053e0) at pthread_mutex_lock.c:61
#3  0x00002ac1d30fa131 in before_syscall (dirfd=-100, sb_nr=<value optimized out>, func=<value optimized out>, file=<value optimized out>, 
    flags=<value optimized out>) at ../../sandbox-2.1/libsandbox/libsandbox.c:1022
#4  0x00002ac1d30fee56 in open_DEFAULT (pathname=0x7fff77cbc750 "/proc/19915/maps", flags=0) at ../../sandbox-2.1/libsandbox/wrapper-funcs/__wrapper_simple.c:52
#5  0x00002ac1d421cd11 in open (mi=0x7fff77cbe760, pid=<value optimized out>) at /usr/include/bits/fcntl2.h:54
#6  maps_init (mi=0x7fff77cbe760, pid=<value optimized out>) at ./os-linux.h:73
#7  0x00002ac1d421d57c in find_binary_for_address (as=<value optimized out>, info=<value optimized out>, addr=4205320, dlname=<value optimized out>)
    at dwarf/Gfind_proc_info-lsb.c:246
#8  locate_debug_info (as=<value optimized out>, info=<value optimized out>, addr=4205320, dlname=<value optimized out>) at dwarf/Gfind_proc_info-lsb.c:290
#9  0x00002ac1d421d9bf in callback (info=0x7fff77cbe900, size=<value optimized out>, ptr=<value optimized out>) at dwarf/Gfind_proc_info-lsb.c:580
#10 0x00002ac1d3dc00fe in *__GI___dl_iterate_phdr (callback=0x2ac1d421d600 <callback>, data=0x7fff77cbe990) at dl-iteratephdr.c:76
#11 0x00002ac1d421cb7f in _ULx86_64_dwarf_find_proc_info (as=<value optimized out>, ip=4205320, pi=0x7fff77cbf1f8, need_unwind_info=1, arg=0x7fff77cbf120)
    at dwarf/Gfind_proc_info-lsb.c:732
#12 0x00002ac1d421b284 in fetch_proc_info (c=0x7fff77cbf120, ip=4205320, need_unwind_info=1) at dwarf/Gparser.c:397
#13 0x00002ac1d421c3f0 in _ULx86_64_dwarf_find_save_locs (c=0x7fff77cbf120) at dwarf/Gparser.c:825
#14 0x00002ac1d421c8e9 in _ULx86_64_dwarf_step (c=0x2ac1d33053e0) at dwarf/Gstep.c:35
#15 0x00002ac1d421eed4 in _ULx86_64_step (cursor=0x2ac1d33053e0) at x86_64/Gstep.c:42
#16 0x00002ac1d333623d in GetStackTrace (result=0x7fff77cbf920, max_depth=42, skip_count=0) at src/stacktrace_libunwind-inl.h:81
#17 0x00002ac1d332d0b7 in MallocHook_GetCallerStackTrace (result=0x7fff77cbfbe8, max_depth=1, skip_count=<value optimized out>) at src/malloc_hook.cc:324
#18 0x00002ac1d33333be in MallocHook::GetCallerStackTrace (start=<value optimized out>, size=<value optimized out>) at ./src/google/malloc_hook.h:192
#19 MemoryRegionMap::RecordRegionAddition (start=<value optimized out>, size=<value optimized out>) at src/memory_region_map.cc:471
#20 0x00002ac1d333bd65 in MallocHook::InvokeMmapHook (start=0x0, length=8200, prot=3, flags=34, fd=-1, offset=0) at src/malloc_hook-inl.h:141
#21 mmap (start=0x0, length=8200, prot=3, flags=34, fd=-1, offset=0) at src/malloc_hook.cc:471
#22 0x00002ac1d30fab62 in malloc (size=8200) at ../../sandbox-2.1/libsandbox/memory.c:26
#23 0x00002ac1d31004fb in __xmalloc (size=47011960214496, file=0x80 <Address 0x80 out of bounds>, func=0x2ac1d3100e81 "open_rd", line=18446744073709551615)
    at ../../sandbox-2.1/libsbutil/sb_memory.c:31
#24 0x00002ac1d30f9926 in resolve_path (path=0x2ac1d4705d6e "/etc/group", follow_link=0) at ../../sandbox-2.1/libsandbox/libsandbox.c:205
#25 0x00002ac1d30fa519 in check_syscall (dirfd=-100, sb_nr=<value optimized out>, func=<value optimized out>, file=<value optimized out>, 
    flags=<value optimized out>) at ../../sandbox-2.1/libsandbox/libsandbox.c:874
#26 before_syscall (dirfd=-100, sb_nr=<value optimized out>, func=<value optimized out>, file=<value optimized out>, flags=<value optimized out>)
    at ../../sandbox-2.1/libsandbox/libsandbox.c:1062
#27 0x00002ac1d30fe92c in fopen_DEFAULT (pathname=0x2ac1d4705d6e "/etc/group", mode=0x2ac1d4705d6a "rme")
    at ../../sandbox-2.1/libsandbox/wrapper-funcs/__wrapper_simple.c:52
#28 0x00002ac1d4701623 in internal_setgrent (ent=0x2ac1d4907140, stayopen=1, needent=1) at nss_compat/compat-grp.c:124
#29 0x00002ac1d4702336 in _nss_compat_getgrent_r (grp=0x2ac1d400fb80, buffer=0x1e40800 "", buflen=1024, errnop=0x2ac1d46b3eb8) at nss_compat/compat-grp.c:396
#30 0x00002ac1d3d9b63a in __nss_getent_r (getent_func_name=0x2ac1d3dd7d4a "getgrent_r", setent_func_name=<value optimized out>, 
    lookup_fct=0x2ac1d3d9c1b0 <*__GI___nss_group_lookup2>, nip=0x2ac1d400fc30, startp=<value optimized out>, last_nip=<value optimized out>, stayopen_tmp=0x0, 
    res=0, resbuf=0x2ac1d400fb80, buffer=0x1e40800 "", buflen=1024, result=0x7fff77cc6078, h_errnop=0x0) at getnssent_r.c:164
#31 0x00002ac1d3d582c6 in __getgrent_r (resbuf=<value optimized out>, buffer=<value optimized out>, buflen=<value optimized out>, result=0x7fff77cbf1f8)
    at ../nss/getXXent_r.c:162
#32 0x00002ac1d3d9b253 in __nss_getent (func=0x2ac1d3d58230 <__getgrent_r>, resbuf=0x2ac1d400fb80, buffer=0x2ac1d400ddd8, buflen=<value optimized out>, 
    buffer_size=0x2ac1d400fba0, h_errnop=0x0) at getnssent.c:38
#33 0x00002ac1d3d57bc2 in getgrent () at ../nss/getXXent.c:84
#34 0x0000000000405f41 in TestLibCAllocate () at src/tests/heap-checker_unittest.cc:832
#35 0x0000000000407866 in main (argc=<value optimized out>, argv=<value optimized out>) at src/tests/heap-checker_unittest.cc:1343


It would be a good idea to have a way to tell the sandbox to only rely on ptrace-based sandboxing in such a case.
Comment 1 SpanKY gentoo-dev 2009-10-25 08:59:44 UTC 
Created attachment 208180 [details, diff]
libsandbox-mmap.patch

give this patch a try please
Comment 2 Diego Elio Pettenò (RETIRED) gentoo-dev 2009-10-25 21:33:27 UTC 
Patch works fine. When in tree I'll "test?" depend on the new sandbox.
Comment 4 Diego Elio Pettenò (RETIRED) gentoo-dev 2010-08-05 23:09:58 UTC 
Mike can we get a sandbox with this patch added to the tree? Pleeease.
Comment 5 SpanKY gentoo-dev 2010-08-15 05:40:16 UTC 
it'll happen.  open bugs clutter my queue.
Comment 6 Diego Elio Pettenò (RETIRED) gentoo-dev 2010-08-19 12:15:26 UTC 
Did you revert this patch by chance? Because 2.3-r1 has the problem as well and I'm sure the patch worked:

#0  __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:136
#1  0x00002b62d3ff5584 in _L_lock_999 () from /lib/libpthread.so.0
#2  0x00002b62d3ff539a in __pthread_mutex_lock (mutex=0x2b62d3852400) at pthread_mutex_lock.c:61
#3  0x00002b62d3646294 in before_syscall (dirfd=-100, sb_nr=-3, func=0x2b62d364d16b "open_rd", file=0x7fff3d62f510 "/proc/28612/maps", flags=0)
    at ../../sandbox-2.3/libsandbox/libsandbox.c:1049
#4  0x00002b62d3648b95 in open_DEFAULT (pathname=0x7fff3d62f510 "/proc/28612/maps", flags=0) at ../../sandbox-2.3/libsandbox/wrapper-funcs/__wrapper_simple.c:52
#5  0x00002b62d477e8c6 in open (addr=4204712, dlname=<value optimized out>, as=<value optimized out>, info=<value optimized out>) at /usr/include/bits/fcntl2.h:54
#6  maps_init (addr=4204712, dlname=<value optimized out>, as=<value optimized out>, info=<value optimized out>) at ./os-linux.h:73
#7  find_binary_for_address (addr=4204712, dlname=<value optimized out>, as=<value optimized out>, info=<value optimized out>) at dwarf/Gfind_proc_info-lsb.c:246
#8  locate_debug_info (addr=4204712, dlname=<value optimized out>, as=<value optimized out>, info=<value optimized out>) at dwarf/Gfind_proc_info-lsb.c:290
#9  0x00002b62d477f3d5 in callback (info=0x7fff3d631670, size=<value optimized out>, ptr=0x7fff3d631700) at dwarf/Gfind_proc_info-lsb.c:580
#10 0x00002b62d4310c2e in *__GI___dl_iterate_phdr (callback=0x2b62d477f040 <callback>, data=0x7fff3d631700) at dl-iteratephdr.c:75
#11 0x00002b62d477f91f in _ULx86_64_dwarf_find_proc_info (as=0x2b62d49871c0, ip=4204712, pi=0x7fff3d631f98, need_unwind_info=1, arg=0x7fff3d631ec0)
    at dwarf/Gfind_proc_info-lsb.c:732
#12 0x00002b62d477d12c in fetch_proc_info (c=0x7fff3d631ec0, ip=4204712, need_unwind_info=1) at dwarf/Gparser.c:397
#13 0x00002b62d477e230 in _ULx86_64_dwarf_find_save_locs (c=0x7fff3d631ec0) at dwarf/Gparser.c:825
#14 0x00002b62d477e749 in _ULx86_64_dwarf_step (c=0x7fff3d631ec0) at dwarf/Gstep.c:35
#15 0x00002b62d4780b16 in _ULx86_64_step (cursor=<value optimized out>) at x86_64/Gstep.c:42
#16 0x00002b62d3886b63 in GetStackTrace (result=<value optimized out>, max_depth=42, skip_count=<value optimized out>) at src/stacktrace_libunwind-inl.h:114
#17 0x00002b62d387d2b7 in MallocHook_GetCallerStackTrace (result=0x7fff3d632998, max_depth=1, skip_count=<value optimized out>) at src/malloc_hook.cc:338
#18 0x00002b62d388479e in MallocHook::GetCallerStackTrace (start=<value optimized out>, size=<value optimized out>) at ./src/google/malloc_hook.h:192
#19 MemoryRegionMap::RecordRegionAddition (start=<value optimized out>, size=<value optimized out>) at src/memory_region_map.cc:471
#20 0x00002b62d388e8a5 in MallocHook::InvokeMmapHook (start=0x0, length=8200, prot=3, flags=34, fd=-1, offset=0) at src/malloc_hook-inl.h:150
#21 mmap (start=0x0, length=8200, prot=3, flags=34, fd=-1, offset=0) at src/malloc_hook.cc:485
#22 0x00002b62d3646cab in sb_mmap (size=8200) at ../../sandbox-2.3/libsandbox/memory.c:26
#23 malloc (size=8200) at ../../sandbox-2.3/libsandbox/memory.c:46
#24 0x00002b62d364c6db in __xmalloc (size=8192, file=0x2b62d364d188 "../../sandbox-2.3/libsandbox/libsandbox.c", func=0x2b62d364d2f1 "resolve_path", line=214)
    at ../../sandbox-2.3/libsbutil/sb_memory.c:31
#25 0x00002b62d3645a06 in resolve_path (path=0x2b62d4c70eee "/etc/group", follow_link=0) at ../../sandbox-2.3/libsandbox/libsandbox.c:214
#26 0x00002b62d364669e in check_syscall (dirfd=<value optimized out>, sb_nr=-3, func=0x2b62d364d16b "open_rd", file=0x2b62d4c70eee "/etc/group", flags=0)
    at ../../sandbox-2.3/libsandbox/libsandbox.c:901
#27 before_syscall (dirfd=<value optimized out>, sb_nr=-3, func=0x2b62d364d16b "open_rd", file=0x2b62d4c70eee "/etc/group", flags=0)
    at ../../sandbox-2.3/libsandbox/libsandbox.c:1089
#28 0x00002b62d3648eac in fopen_DEFAULT (pathname=0x2b62d4c70eee "/etc/group", mode=0x2b62d4c70eea "rme")
    at ../../sandbox-2.3/libsandbox/wrapper-funcs/__wrapper_simple.c:52
#29 0x00002b62d4c6c5d3 in internal_setgrent (ent=0x2b62d4e73140, stayopen=1, needent=1) at nss_compat/compat-grp.c:124
#30 0x00002b62d4c6cfc6 in _nss_compat_getgrent_r (grp=0x2b62d4570c20, buffer=0x2814800 "", buflen=1024, errnop=0x2b62d4c154b0) at nss_compat/compat-grp.c:396
#31 0x00002b62d42eb7fa in __nss_getent_r (getent_func_name=0x2b62d4333448 "getgrent_r", setent_func_name=0x2b62d4333453 "setgrent", 
    lookup_fct=<value optimized out>, nip=0x2b62d4570d10, startp=<value optimized out>, last_nip=0x2b62d4570d20, stayopen_tmp=0x0, res=0, resbuf=0x2b62d4570c20, 
    buffer=0x2814800 "", buflen=1024, result=0x7fff3d638e38, h_errnop=0x0) at getnssent_r.c:164
#32 0x00002b62d42a7eb6 in __getgrent_r (resbuf=<value optimized out>, buffer=<value optimized out>, buflen=<value optimized out>, result=<value optimized out>)
    at ../nss/getXXent_r.c:162
#33 0x00002b62d42eb403 in __nss_getent (func=0x2b62d42a7e20 <__getgrent_r>, resbuf=0x2b62d4570c20, buffer=0x2b62d456edd8, buflen=<value optimized out>, 
    buffer_size=0x2b62d4570c40, h_errnop=0x0) at getnssent.c:37
#34 0x00002b62d42a7622 in getgrent () at ../nss/getXXent.c:85
#35 0x0000000000407841 in TestLibCAllocate () at src/tests/heap-checker_unittest.cc:852
#36 0x00000000004078e6 in main (argc=<value optimized out>, argv=<value optimized out>) at src/tests/heap-checker_unittest.cc:1370
Comment 7 SpanKY gentoo-dev 2010-08-19 15:52:49 UTC 
you can clearly see sb_mmap() in that trace, so obviously no, the patch hasnt been reverted
Comment 8 SpanKY gentoo-dev 2012-06-23 02:59:29 UTC 
we need a reduced test case here ...