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David van Moolenbroek f310aefcbd PM: resolve fork/kill race condition 
When a process forks, VFS is informed on behalf of the child. This is
correct, because otherwise signals to the new child could get lost.
However, that means that the parent is not blocked from being killed
by a signal while the child is blocked on this VFS call. As a result,
by the time that the VFS reply comes in, the parent may already be
dead, and the child may thus have been assigned a new parent: INIT.

Previously, PM would blindly reply to the parent when the VFS reply
for the fork came in. Thus, it could end up sending a reply to INIT,
even though INIT did not issue the fork(2) call. This could end up
satisfying a different call from INIT (typically waitpid(2)) and then
cause an error when that other call was complete.

It would be possible to set VFS_CALL on both forking parent and child.
This patch instead adds a flag (NEW_PARENT) to note that a process's
parent has changed during a VFS call.

Change-Id: Iad930b2e441db54fe6f7d2fd011f0f6a26e2923d
2014-03-01 09:04:59 +01:00
..
blocktest Add testvnd.sh test script 2014-03-01 09:04:54 +01:00
ds Removing obsolete _MINIX define 2013-02-26 09:44:20 +00:00
fbdtest Add fbd -- Faulty Block Device driver 2011-12-11 22:45:46 +01:00
ipc Removing obsolete _MINIX define 2013-02-26 09:44:20 +00:00
kernel kernel: move do_padconf and add a test case 2013-08-29 09:23:10 -04:00
safecopy Removing obsolete _MINIX define 2013-02-26 09:44:20 +00:00
common.c Fix e_f to print the saved errno. 2013-08-23 13:20:42 +02:00
common.h many new tests 2013-04-19 16:21:48 +00:00
magic.h tests cleanup 2013-04-17 22:00:59 +00:00
Makefile PM: rework signal handling 2014-03-01 09:04:59 +01:00
mod.c ld.so: be more mmap()-behaviour-independent 2012-06-25 14:13:07 +02:00
run PM: rework signal handling 2014-03-01 09:04:59 +01:00
t10a.c retire _PROTOTYPE 2012-03-25 16:17:10 +02:00
t11a.c retire _PROTOTYPE 2012-03-25 16:17:10 +02:00
t11b.c retire _PROTOTYPE 2012-03-25 16:17:10 +02:00
t40a.c tests cleanup 2013-04-17 22:00:59 +00:00
t40b.c tests cleanup 2013-04-17 22:00:59 +00:00
t40c.c VFS: select(2) fixes 2014-03-01 09:04:51 +01:00
t40d.c tests cleanup 2013-04-17 22:00:59 +00:00
t40e.c tests cleanup 2013-04-17 22:00:59 +00:00
t40f.c tests cleanup 2013-04-17 22:00:59 +00:00
t40g.c VFS: select(2) fixes 2014-03-01 09:04:51 +01:00
t60a.c Implement issetugid syscall 2011-11-28 10:03:43 +00:00
t60b.c Implement issetugid syscall 2011-11-28 10:03:43 +00:00
t67a.c test67: test opening files and sockets with O_CLOEXEC 2013-02-28 10:08:54 +00:00
t67b.c test67: test opening files and sockets with O_CLOEXEC 2013-02-28 10:08:54 +00:00
t68a.c test68: test pipe2 functionality 2013-02-28 10:08:54 +00:00
t68b.c test68: test pipe2 functionality 2013-02-28 10:08:54 +00:00
test1.c tests cleanup 2013-04-17 22:00:59 +00:00
test2.c Alignement on netbsd types, part 1 2014-02-18 11:25:01 +01:00
test3.c tests cleanup 2013-04-17 22:00:59 +00:00
test4.c tests cleanup 2013-04-17 22:00:59 +00:00
test5.c tests cleanup 2013-04-17 22:00:59 +00:00
test6.c tests cleanup 2013-04-17 22:00:59 +00:00
test7.c tests cleanup 2013-04-17 22:00:59 +00:00
test8.c tests cleanup 2013-04-17 22:00:59 +00:00
test9.c tests cleanup 2013-04-17 22:00:59 +00:00
test10.c tests cleanup 2013-04-17 22:00:59 +00:00
test11.c tests cleanup 2013-04-17 22:00:59 +00:00
test12.c tests cleanup 2013-04-17 22:00:59 +00:00
test13.c tests cleanup 2013-04-17 22:00:59 +00:00
test14.c tests cleanup 2013-04-17 22:00:59 +00:00
test15.c tests cleanup 2013-04-17 22:00:59 +00:00
test16.c tests cleanup 2013-04-17 22:00:59 +00:00
test17.c tests cleanup 2013-04-17 22:00:59 +00:00
test18.c tests cleanup 2013-04-17 22:00:59 +00:00
test19.c tests cleanup 2013-04-17 22:00:59 +00:00
test20.c tests cleanup 2013-04-17 22:00:59 +00:00
test21.c tests cleanup 2013-04-17 22:00:59 +00:00
test22.c tests cleanup 2013-04-17 22:00:59 +00:00
test23.c tests cleanup 2013-04-17 22:00:59 +00:00
test24.c test24: fix memory leak. 2014-01-13 22:22:25 -05:00
test25.c tests cleanup 2013-04-17 22:00:59 +00:00
test26.c tests cleanup 2013-04-17 22:00:59 +00:00
test27.c tests cleanup 2013-04-17 22:00:59 +00:00
test28.c tests cleanup 2013-04-17 22:00:59 +00:00
test29.c tests cleanup 2013-04-17 22:00:59 +00:00
test30.c tests cleanup 2013-04-17 22:00:59 +00:00
test31.c tests cleanup 2013-04-17 22:00:59 +00:00
test32.c tests cleanup 2013-04-17 22:00:59 +00:00
test33.c tests cleanup 2013-04-17 22:00:59 +00:00
test34.c tests cleanup 2013-04-17 22:00:59 +00:00
test35.c tests cleanup 2013-04-17 22:00:59 +00:00
test36.c tests cleanup 2013-04-17 22:00:59 +00:00
test37.c tests cleanup 2013-04-17 22:00:59 +00:00
test38.c tests cleanup 2013-04-17 22:00:59 +00:00
test39.c tests cleanup 2013-04-17 22:00:59 +00:00
test40.c VFS: select(2) fixes 2014-03-01 09:04:51 +01:00
test41.c tests cleanup 2013-04-17 22:00:59 +00:00
test42.c test42: skip single step test 2013-06-25 13:51:24 +02:00
test43.c tests cleanup 2013-04-17 22:00:59 +00:00
test44.c tests cleanup 2013-04-17 22:00:59 +00:00
test45.c tests cleanup 2013-04-17 22:00:59 +00:00
test45.h tests cleanup 2013-04-17 22:00:59 +00:00
test46.c tests cleanup 2013-04-17 22:00:59 +00:00
test47.c tests cleanup 2013-04-17 22:00:59 +00:00
test48.c tests cleanup 2013-04-17 22:00:59 +00:00
test49.c tests cleanup 2013-04-17 22:00:59 +00:00
test50.c tests cleanup 2013-04-17 22:00:59 +00:00
test51.c tests cleanup 2013-04-17 22:00:59 +00:00
test52.c tests cleanup 2013-04-17 22:00:59 +00:00
test53.c Replaced add64, add64u and add64ul with operators. 2013-11-13 13:11:33 +00:00
test54.c arm:fix for test54 and test55 2013-09-27 15:15:37 +02:00
test55.c test55: add tests for getvfsstat(2) 2014-02-18 11:25:02 +01:00
test56.c test56: fix race condition 2014-03-01 09:04:59 +01:00
test57.c tests cleanup 2013-04-17 22:00:59 +00:00
test57loop.S Macros for symbols used in both ASM and C 2010-08-17 16:44:07 +00:00
test58.c tests cleanup 2013-04-17 22:00:59 +00:00
test59.c tests cleanup 2013-04-17 22:00:59 +00:00
test60.c tests cleanup 2013-04-17 22:00:59 +00:00
test61.c tests cleanup 2013-04-17 22:00:59 +00:00
test62.c tests cleanup 2013-04-17 22:00:59 +00:00
test63.c tests cleanup 2013-04-17 22:00:59 +00:00
test64.c tests cleanup 2013-04-17 22:00:59 +00:00
test65.c tests cleanup 2013-04-17 22:00:59 +00:00
test66.c tests cleanup 2013-04-17 22:00:59 +00:00
test66expected.h test66: float smoke test, floating point fixes (arm) 2013-02-20 12:29:37 +00:00
test67.c tests cleanup 2013-04-17 22:00:59 +00:00
test68.c tests cleanup 2013-04-17 22:00:59 +00:00
test69.c tests cleanup 2013-04-17 22:00:59 +00:00
test70.c test70: reduce ITERATIONS 2013-09-16 15:33:44 +00:00
test71.c vm: mmap support 2013-05-31 15:42:01 +00:00
test72.c VM: readd support for forgetting cached FS blocks 2014-03-01 09:04:53 +01:00
test73.c many new tests 2013-04-19 16:21:48 +00:00
test74.c VM bugfix & regression test 2014-01-09 18:28:11 +01:00
test75.c test75: fix child run time check bug 2013-10-14 13:20:44 +02:00
test76.c tests: add test76 for interrupting VFS operations 2014-02-18 11:25:03 +01:00
test77.c tests: add test77 for opening/closing PTYs 2014-02-18 11:25:03 +01:00
test78.c netbsd dirent.h, import sys/sys *.h, mfs cleanup 2014-03-01 09:04:59 +01:00
test79.c PM: resolve fork/kill race condition 2014-03-01 09:04:59 +01:00
testcache.c vm: mmap support 2013-05-31 15:42:01 +00:00
testcache.h vm: mmap support 2013-05-31 15:42:01 +00:00
testinterp.sh vfs,avfs: verify an interpreter was found on #! line 2011-12-21 23:44:13 +01:00
testisofs.sh run: allow scripts to be run as root 2013-11-28 13:31:37 +00:00
testmfs.sh testmfs, testisofs: MFS format, ISO functionality 2013-11-21 10:17:43 +00:00
testsh1.sh Importing usr.bin/wc 2013-08-25 18:51:35 +02:00
testsh2.sh run: allow scripts to be run as root 2013-11-28 13:31:37 +00:00
testvm.c VM: readd support for forgetting cached FS blocks 2014-03-01 09:04:53 +01:00
testvm.conf VM: readd support for forgetting cached FS blocks 2014-03-01 09:04:53 +01:00
testvm.h many new tests 2013-04-19 16:21:48 +00:00
testvnd.sh Add testvnd.sh test script 2014-03-01 09:04:54 +01:00
tvnd.c Extend dupfrom(2) into copyfd(2) 2014-03-01 09:04:58 +01:00