tree 28c25b5092a209cd55d5d3f29dea827bdde70abe
parent 5ab46b345e418747b3a52f0892680c0745c4223c
author Oleg Nesterov <oleg@redhat.com> 1251998505 +0200
committer Jiri Slaby <jirislaby@gmail.com> 1279266526 +0200

rlimits: make sure ->rlim_max never grows in sys_setrlimit

Mostly preparation for Jiri's changes, but probably makes sense anyway.

sys_setrlimit() checks new_rlim.rlim_max <= old_rlim->rlim_max, but when
it takes task_lock() old_rlim->rlim_max can be already lowered. Move this
check under task_lock().

Currently this is not important, we can only race with our sub-thread,
this means the application is stupid. But when we change the code to allow
the update of !current task's limits, it becomes important to make sure
->rlim_max can be lowered "reliably" even if we race with the application
doing sys_setrlimit().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>