- 30 Apr, 2008 40 commits
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Oleg Nesterov authored
1. sys_getsid() needs rcu_read_lock() to derive the session _nr, even if the task is current, otherwise we can race with another thread which does sys_setsid(). 2. The task can exit between find_task_by_vpid() and task_session_vnr(), in that unlikely case sys_getsid() returns 0 instead of -ESRCH. Signed-off-by:
Oleg Nesterov <oleg@tv-sign.ru> Cc: Roland McGrath <roland@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Oleg Nesterov authored
Use change_pid() instead of detach_pid() + attach_pid() in __set_special_pids(). This way task_session() is not NULL in between. Signed-off-by:
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Oleg Nesterov authored
Use change_pid() instead of detach_pid() + attach_pid() in sys_setpgid(). This way task_pgrp() is not NULL in between. Signed-off-by:
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Oleg Nesterov authored
Based on Eric W. Biederman's idea. Without tasklist_lock held task_session()/task_pgrp() can return NULL if the caller races with setprgp()/setsid() which does detach_pid() + attach_pid(). This can happen even if task == current. Intoduce the new helper, change_pid(), which should be used instead. This way the caller always sees the special pid != NULL, either old or new. Also change the prototype of attach_pid(), it always returns 0 and nobody check the returned value. Signed-off-by:
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Oleg Nesterov authored
Based on Eric W. Biederman's idea. Unless task == current, without tasklist_lock held task_session()/task_pgrp() can return NULL if the caller races with de_thread() which switches the group leader. Change transfer_pid() to not clear old->pids[type].pid for the old leader. This means that its .pid can point to "nowhere", but this is already true for sub-threads, and the old leader is not group_leader() any longer. IOW, with or without this change we can't trust task's special pids unless it is the group leader. With this change the following code rcu_read_lock(); task = find_task_by_xxx(); do_something(task_pgrp(task), task_session(task)); rcu_read_unlock(); can't race with exec and hit the NULL pid. Signed-off-by:
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Pavel Emelyanov authored
There are some places that are known to operate on tasks' global pids only: * the rest_init() call (called on boot) * the kgdb's getthread * the create_kthread() (since the kthread is run in init ns) So use the find_task_by_pid_ns(..., &init_pid_ns) there and schedule the find_task_by_pid for removal. [sukadev@us.ibm.com: Fix warning in kernel/pid.c] Signed-off-by:
Pavel Emelyanov <xemul@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by:
Sukadev Bhattiprolu <sukadev@us.ibm.com> Signed-off-by:
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Pavel Emelyanov authored
The pid to lookup a task by is passed inside taskstats code via genetlink message. Since netlink packets are now processed in the context of the sending task, this is correct to lookup the task with find_task_by_vpid() here. Besides, I fix the call to fill_pid() from taskstats_exit(), since the tsk->pid is not required in fill_pid() in this case, and the pid field on task_struct is going to be deprecated as well. Signed-off-by:
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Oleg Nesterov authored
The callers of free_pidmap() pass 2 members of "struct upid", we can just pass "struct upid *" instead. Shaves off 10 bytes from pid.o. Also, simplify the alloc_pid's "out_free:" error path a little bit. This way it looks more clear which subset of pid->numbers[] we are freeing. Signed-off-by:
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Sukadev Bhattiprolu authored
Factor out the code used to allocate/free a pts index into new interfaces, devpts_new_index() and devpts_kill_index(). This localizes the external data structures used in managing the pts indices. [akpm@linux-foundation.org: undo accidental mutex2sem conversion] Signed-off-by:
Serge Hallyn <serue@us.ibm.com> Signed-off-by:
Matt Helsley <matthltc@us.ibm.com> Acked-by:
H. Peter Anvin <hpa@zytor.com> Signed-off-by:
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Sukadev Bhattiprolu authored
Have ptmx_open() propagate any error code returned by devpts_pty_new() (which returns either 0 or -ENOMEM anyway). Signed-off-by:
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Hiroshi Shimamoto authored
At ptmx_open(), the 2nd parameter for check_tty_count() should be "ptmx_open". Signed-off-by:
Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com> Acked-by:
Alan Cox <alan@redhat.com> Signed-off-by:
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Alan Cox authored
Simple search/replace except for synclink.c where I noticed a real bug and fixed it too. It was doing NULL + offset, then checking for NULL if the remap failed. Signed-off-by:
Jiri Slaby <jirislaby@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by:
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Alan Cox authored
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Alan Cox authored
Something Arjan suggested which allows us to clean up the code nicely Signed-off-by:
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Alan Cox authored
Fix the rather strange buffer management on open that turned up while auditing for BKL dependencies. Signed-off-by:
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Alan Cox authored
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Alan Cox authored
Clean up the epca driver Signed-off-by:
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Alan Cox authored
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Alan Cox authored
- Use the tty baud functions - Call driver termios methods directly holding the right locking - Check for a write method Signed-off-by:
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Alan Cox authored
- Operations are now a shared const function block as with most other Linux objects - Introduce wrappers for some optional functions to get consistent behaviour - Wrap put_char which used to be patched by the tty layer - Document which functions are needed/optional - Make put_char report success/fail - Cache the driver->ops pointer in the tty as tty->ops - Remove various surplus lock calls we no longer need - Remove proc_write method as noted by Alexey Dobriyan - Introduce some missing sanity checks where certain driver/ldisc combinations would oops as they didn't check needed methods were present [akpm@linux-foundation.org: fix fs/compat_ioctl.c build] [akpm@linux-foundation.org: fix isicom] [akpm@linux-foundation.org: fix arch/ia64/hp/sim/simserial.c build] [akpm@linux-foundation.org: fix kgdb] Signed-off-by:
Greg Kroah-Hartman <gregkh@suse.de> Cc: Jason Wessel <jason.wessel@windriver.com> Signed-off-by:
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Alan Cox authored
[akpm@linux-foundation.org: fix arm, cleanups] Signed-off-by:
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Alan Cox authored
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Alan Cox authored
This driver somehow escaped the tty operations changes way back when. Update it so that we can switch to tty->ops shortly. Signed-off-by:
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Alan Cox authored
We are about to change the tty layer to avoid keeping private copies of all the methods in each tty. We have to update the pty layer first as it currently patches the ioctl method according to the tty type. Use multiple tty operations sets instead. Signed-off-by:
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Alan Cox authored
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Karsten Keil <kkeil@suse.de> Signed-off-by:
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Alan Cox authored
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Alan Cox authored
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Alan Cox authored
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Alan Cox authored
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Alan Cox authored
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Alan Cox authored
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Alan Cox authored
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Alan Cox authored
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Alan Cox authored
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Alan Cox authored
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David Brownell <dbrownell@users.sourceforge.net> Signed-off-by:
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Alan Cox authored
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Greg Ungerer <gerg@uclinux.org> Signed-off-by:
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Alan Cox authored
Put the changes into the drivers first. This will still compile/work but produce a warning if bisected so can still be debugged Signed-off-by:
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Alan Cox authored
- Stop drivers calling their own flush method indirectly, it obfuscates code and it will change soon anyway - A few more lock_kernel paths temporarily needed in some driver internal waiting code - Remove private put_char method that does a write call for one char - we have that anyway - Most but not yet all of the termios copy under lock fixing (some has other dependencies to follow) - Note a few locking bugs in drivers found in the process - Kill remaining [ab]users of TIOCG/SSOFTCAR in the driver, these must go to fix the termios locking Signed-off-by:
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Julia Lawall authored
The functions time_before, time_before_eq, time_after, and time_after_eq are more robust for comparing jiffies against other values. A simplified version of the semantic patch making this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @ change_compare_np @ expression E; @@ ( - jiffies <= E + time_before_eq(jiffies,E) | - jiffies >= E + time_after_eq(jiffies,E) | - jiffies < E + time_before(jiffies,E) | - jiffies > E + time_after(jiffies,E) ) @ include depends on change_compare_np @ @@ #include <linux/jiffies.h> @ no_include depends on !include && change_compare_np @ @@ #include <linux/...> + #include <linux/jiffies.h> // </smpl> Signed-off-by:
Julia Lawall <julia@diku.dk> Cc: Jiri Slaby <jirislaby@gmail.com> Signed-off-by:
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Jiri Slaby authored
Rename defines to be in RIO* namespace to not to collide with other defines in tree. This broke (as akpm correctly pointed out) some allmodconfig builds, e.g. on ppc: In file included from drivers/char/rio/rio_linux.c:81: drivers/char/rio/cirrus.h:202:1: warning: "COMPLETE" redefined In file included from include/net/netns/ipv4.h:8, from include/net/net_namespace.h:13, from include/linux/seq_file.h:7, from include/asm/machdep.h:12, from include/asm/pci.h:17, from include/linux/pci.h:951, from drivers/char/rio/rio_linux.c:50: include/net/inet_frag.h:28:1: warning: this is the location of the previous definition Signed-off-by:
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