** Description changed: - When a user logs in via ssh with a large number of group memberships it - causes a seg fault when running ps (procps version 3.2.8). + [Impact] + + * Users with large numbers of groups will cause ps to segfault. This + can happen when directory services such as Active directory or possibly + others like ldap are in use. + + * The upload expands buffer sizes to be in line with upstream procps. + + [Test Case] + + * Using a directory service create a user that belongs to a very large number of groups. + * run ps. Which will segfault. + + * these should allow someone who is not familiar with the affected + package to reproduce the bug and verify that the updated package fixes + the problem. + + [Regression Potential] + + * Regressions are highly unlikely as only buffer sizes were changed to + be in line with commit 7933435584aa1fd75460f4c7715a3d4855d97c1c of + upstream procps. + + [Other Info] + + * This fix is not in quantal or raring, but should be available in saucy assuming the version of procps in there is greater than 3.3.4 + + + + When a user logs in via ssh with a large number of group memberships it causes a seg fault when running ps (procps version 3.2.8). Description: Ubuntu 12.04.2 LTS Release: 12.04 procps: - Installed: 1:3.2.8-11ubuntu6 - Candidate: 1:3.2.8-11ubuntu6 - Version table: - *** 1:3.2.8-11ubuntu6 0 - 500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages - 100 /var/lib/dpkg/status + Installed: 1:3.2.8-11ubuntu6 + Candidate: 1:3.2.8-11ubuntu6 + Version table: + *** 1:3.2.8-11ubuntu6 0 + 500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages + 100 /var/lib/dpkg/status Expected results: ps completes and returns to prompt - PID TTY TIME CMD + PID TTY TIME CMD 12707 pts/1 00:00:00 sudo 12708 pts/1 00:00:00 bash Actual results: - PID TTY TIME CMD + PID TTY TIME CMD 12707 pts/1 00:00:00 sudo 12708 pts/1 00:00:00 bash - Signal 11 (SEGV) caught by ps (procps version 3.2.8). - Here is the end of a strace on a ps: mmap(NULL, 135168, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4da880e000 mremap(0x7f4da880e000, 135168, 266240, MREMAP_MAYMOVE) = 0x7f4da87cd000 mremap(0x7f4da87cd000, 266240, 528384, MREMAP_MAYMOVE) = 0x7f4da929d000 mremap(0x7f4da929d000, 528384, 1052672, MREMAP_MAYMOVE) = 0x7f4da919c000 mremap(0x7f4da919c000, 1052672, 2101248, MREMAP_MAYMOVE) = 0x7f4da862e000 mremap(0x7f4da862e000, 2101248, 4198400, MREMAP_MAYMOVE) = 0x7f4da822d000 mremap(0x7f4da822d000, 4198400, 8392704, MREMAP_MAYMOVE) = 0x7f4da7a2c000 mremap(0x7f4da7a2c000, 8392704, 16781312, MREMAP_MAYMOVE) = 0x7f4da6a2b000 mremap(0x7f4da6a2b000, 16781312, 33558528, MREMAP_MAYMOVE) = 0x7f4da4a2a000 mremap(0x7f4da4a2a000, 33558528, 67112960, MREMAP_MAYMOVE) = 0x7f4da0a29000 mremap(0x7f4da0a29000, 67112960, 134221824, MREMAP_MAYMOVE) = 0x7f4d98a28000 mremap(0x7f4d98a28000, 134221824, 268439552, MREMAP_MAYMOVE) = 0x7f4d88a27000 mremap(0x7f4d88a27000, 268439552, 536875008, MREMAP_MAYMOVE) = 0x7f4d68a26000 mremap(0x7f4d68a26000, 536875008, 1073745920, MREMAP_MAYMOVE) = 0x7f4d28a25000 mremap(0x7f4d28a25000, 1073745920, 2147487744, MREMAP_MAYMOVE) = 0x7f4ca8a24000 mremap(0x7f4ca8a24000, 2147487744, 4096, MREMAP_MAYMOVE) = 0x7f4ca8a24000 --- SIGSEGV (Segmentation fault) @ 0 (0) --- write(2, "\n\nSignal 11 (SEGV) caught by ps "..., 132 Signal 11 (SEGV) caught by ps (procps version 3.2.8). Please send bug reports to <feedb...@lists.sf.net> or <alb...@users.sf.net> ) = 132 exit_group(139) - Here is the debian bug report on it. http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=702965 It looks like the 12.10 repos have the newer version of the procps and libprocps0 packages which address the problem. My question being can these newer version be put into place for 12.04 or am I stuck trying to manually intall a newer version fro the 12.10 repos or something along those lines to fix this issue.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1174444 Title: ps segfault when users have large numbers of group memberships (procps 3.2.8) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/procps/+bug/1174444/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
