- 04 Jan, 2005 40 commits
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Neil Brown authored
No sensible client is ever going to request only the RDATTR_ERROR attribute, so there's no point optimizing for that case. Signed-off-by:
J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by:
Neil Brown <neilb@cse.unsw.edu.au> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Neil Brown authored
Return the special NFSv4 pseudo filesystem fsid (0/0) in a GETATTR on an NFSv4 pseudo filesystem node. Signed-off-by:
Andy Adamson <andros@citi.umich.edu> Signed-off-by:
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Neil Brown authored
We were reporting mounted_on fileid instead of fileid in readdir responses. Signed-off-by:
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Neil Brown authored
Just noticed while fixing some other sparse-related stuff. Signed-off-by:
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Neil Brown authored
Fix open downgrade decode error. Signed-off-by:
Andy Adamson <andros@umich.edu> Signed-off-by:
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Neil Brown authored
Call a helper function from svcauth_unix_accept() and svcauth_null_accept() instead of duplicating code. Signed-off-by:
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Neil Brown authored
Fix some discrepencies between the server-side auth_null and auth_unix rpc code: in particular, make sure we return an auth error in the auth_null case instead of dropping when we fail to match an export entry, and make sure such responses are encoded correctly. Signed-off-by:
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Neil Brown authored
-EAGAIN has a special treatment in the nfsd code since it's used to indicate that an upcall has been initiated and that a request should be dropped pending the upcall result. But when the break_lease functions return -EWOULDBLOCK (==-EAGAIN on most architectures), we actually prefer to return nfserr_jukebox. So translate -EAGAIN returns to -ETIMEDOUT (which will be translated to nfserr_jukebox). Undo the mapping of -EWOULDBLOCK to nfserr_jukebox, since on most architectures that has the undesireable effect of mapping -EAGAIN to nfserr_jukebox. Signed-off-by:
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Pekka Enberg authored
This patch has the following cleanups to oprofile: - Remove spurious casts - vfree() accepts NULL pointers so remove redundant test - The parameter for __free_cpu_buffer() is not used so merge the function with free_cpu_buffer() Signed-off-by:Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by:
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Greg Banks authored
oprofile sparc64 arch updates, including some internal API changes. Signed-off-by:
John Levon <levon@movementarian.org> Signed-off-by:
Greg Banks <gnb@melbourne.sgi.com> Signed-off-by:
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Greg Banks authored
oprofile sh arch updates, including some internal API changes. Signed-off-by:
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Greg Banks authored
oprofile s390 arch updates, including some internal API changes. Signed-off-by:
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Greg Banks authored
oprofile parisc arch updates, including some internal API changes. Signed-off-by:
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Greg Banks authored
oprofile ppc64 arch updates, including some internal API changes. Signed-off-by:
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Greg Banks authored
oprofile arm arch updates, including some internal API changes. Signed-off-by:
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Greg Banks authored
oprofile alpha arch updates, including some internal API changes. Signed-off-by:
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Greg Banks authored
oprofile ia64 arch updates, including some internal API changes and support for stack trace sampling. Signed-off-by:
Keith Owens <kaos@melbourne.sgi.com> Signed-off-by:
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Greg Banks authored
oprofile i386 arch updates, including some internal API changes and support for stack trace sampling. (akpm: I added a nasty hack to fix the x86_64 build. However the feature is untested on x86_64 and probably doesn't work yet). Signed-off-by:
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Greg Banks authored
Allow stack tracing to work when sampling on timer is forced using the timer=1 boot option. Reported by Akinobu Mita. Signed-off-by:
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Greg Banks authored
oprofile arch-independent updates, including some internal API changes and support for stack trace sampling. Signed-off-by:
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Greg Banks authored
Add check_user_page_readable() for kernel modules which need to follow user space addresses but can't use get_user(). Signed-off-by:
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Stephen D. Smalley authored
This patch rewrites the SELinux next_entry() function and all callers to copy entry data from the binary policy into properly aligned buffers, eliminating unaligned accesses. This patch is in response to a bug report from Prarit Bhargava for SELinux and ia64, and he has confirmed that this patch eliminates the unaligned access warnings. Signed-off-by:
Stephen Smalley <sds@epoch.ncsc.mil> Signed-off-by:
James Morris <jmorris@redhat.com> Signed-off-by:
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Stephen D. Smalley authored
This patch adds a member node to selinuxfs to export the security_member_sid interface to userspace for obtaining security polyinstantiation decisions. Signed-off-by:
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Stephen D. Smalley authored
This patch adds new permission checks to the SELinux mmap and mprotect hooks to enable control over the ability to make executable a mapping that can contain data not covered by the existing file-based permission checks. The task->self execmem permission controls the ability to create an executable anonymous mapping or a writable executable private file mapping. The task->file execmod permission controls the ability to make executable a previously written private file mapping, e.g. for text relocations. Thanks to Roland McGrath for input and feedback on earlier versions of this patch. Signed-off-by:
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Stephen D. Smalley authored
This patch for adds dynamic context transition support to SELinux via writes to the existing /proc/pid/attr/current interface. Previously, SELinux only supported exec-based context transitions. This functionality allows privileged applications to apply privilege bracketing without necessarily being refactored to an exec-based model (although such a model has advantages in least privilege and isolation). A process must have setcurrent permission to use this mechanism at all, and the dyntransition permission must be granted between the old and new security contexts. Multi-threaded processes are not allowed to use this operation, as it will yield an inconsistency among the security contexts of the threads sharing the same mm. Ptrace permission is revalidated against the new context if the process is being ptraced. Author: Darrel Goeddel <dgoeddel@trustedcs.com> Signed-off-by:
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Stephen D. Smalley authored
This patch ensures that the comm is included in the audit message if avc_audit is unable to determine the exe due to the mmap_sem being held. This is helpful in tracking down the causes of permission denials that occur in the mmap/mprotect hooks. Signed-off-by:
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Stephen D. Smalley authored
This patch updates the selinux_task_setscheduler hook function to use the standard helper for task permission checks since it is now safe to audit from this hook (due to the upstream change to setscheduler() to not hold the runqueue lock during the security hook call). Signed-off-by:
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Stephen D. Smalley authored
This patch regenerates the SELinux module headers to use a new format and updates their use by the AVC. Signed-off-by:
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James Morris authored
This patch adds an selinuxfs based API to the AVC, to allow monitoring of the cache, and tuning of the cache size. The latter is mediated via the new setsecparam permission. AVC statistics may be monitored via the avcstat utility: http://people.redhat.com/jmorris/selinux/perf/avcstat.cSigned-off-by:
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James Morris authored
Atomic underflow debugging in this kernel exposed a bug in the AVC RCU code, fix below. The effect of this bug would be delayed node reclamation. Signed-off-by:
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James Morris authored
The following patch improves the scalability of SELinux by replacing the global avc_lock with an RCU based scheme by Kaigai Kohei. The size of the cache is made tunable, to allow administrators to tune systems for different workloads, while statistics are exported via selinuxfs to allow AVC performance to be monitored at a low level. AVC nodes are also allocated now via a slab cache, and AVC references have been removed from the code. This code has been extensively tested and benchmarked (see benchmark results below). Baseline performance is not improved, although it is clear that dramatic scalability improvements are achieved. Baseline performance and networking scalability are areas where work is ongoing (in particular, we need to add caching of some network security objects so that we don't fallback to policy database lookups on each permission call). Benchmark results: =============================================================================================== System: 4 node 16-way IA64 NUMA - 'Stream' is based on http://www.cs.virginia.edu/stream/ , HPC memory bandwidth test, higher result is better. - Hackbench: scheduler scalability benchmark by Rusty, lower is better. Standard kernel: 2.6.9-1.648_EL SELINUX=0 : Stream 6159.987MB/s HackBench 53.144 2.6.9-1.648_EL SELINUX=1 : Stream 5872.529MB/s HackBench 1043.132 Kernel with RCU/AVC patches: 2.6.9-1.689_avcrcu.root SELINUX=0 : Stream 8829.647MB/s HackBench 53.976 2.6.9-1.689_avcrcu.root SELINUX=1 : Stream 8817.117MB/s HackBench 50.975 =============================================================================================== System: 8-way PIII 900Mhz Xeon with 9GB RAM Fileystem: ext2 for all testing. Notes: AVC was reset before tests, so avc was flushed. System was run in enforcing mode. Key: std-nolsm: standard kernel with LSM disabled std-lsmcap: standard kernel with LSM enabled, capabilities LSM std-sel-strict: standard kernel with SELinux enabled, capabilities secondary LSM rcu-sel-strict: as above with RCU & AVC stats patches
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James Morris authored
This patch from Kaigai Kohei <kaigai@ak.jp.nec.com> adds irq and irqsave trylock spinlock variants for use by the SELinux AVC RCU patch. Signed-off-by:
Kaigai Kohei <kaigai@ak.jp.nec.com> Signed-off-by:
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Oleg Nesterov authored
__exit_mm() is an inlined version of exit_mm(). This patch unifies them. Saves 356 byte in exit.o. Signed-off-by:
Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by:
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Roland McGrath authored
I just did a quick audit of the use of exit_state and the EXIT_* bit macros. I guess I didn't really review these changes very closely when you did them originally. :-( I found several places that seem like lossy cases of query-replace without enough thought about the code. Linus has previously said the >= tests ought to be & tests instead. But for exit_state, it can only ever be 0, EXIT_DEAD, or EXIT_ZOMBIE--so a nonzero test is actually the same as testing & (EXIT_DEAD|EXIT_ZOMBIE), and maybe its code is a tiny bit better. The case like in choose_new_parent is just confusing, to have the always-false test for EXIT_* bits in ->state there too. The two cases in wants_signal and do_process_times are actual regressions that will give us back old bugs in race conditions. These places had s/TASK/EXIT/ but not s/state/exit_state/, and now there tests for exiting tasks are now wrong and never catching them. I take it back: there is no regression in wants_signal in practice I think, because of the PF_EXITING test that makes the EXIT_* state checks superfluous anyway. So that is just another cosmetic case of confusing code. But in do_process_times, there is that SIGXCPU-while-exiting race condition back again. Signed-off-by:
Roland McGrath <roland@redhat.com> Acked-by:
Ingo Molnar <mingo@elte.hu> Signed-off-by:
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Roland McGrath authored
There is really no point in each task_struct having its own waitchld_exit. In the only use of it, the waitchld_exit of each thread in a group gets woken up at the same time. So, there might as well just be one wait queue for the whole thread group. This patch does that by moving the field from task_struct to signal_struct. It should have no effect on the behavior, but saves a little work and a little storage in the multithreaded case. Signed-off-by:
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Roland McGrath authored
There is a BUG_ON in ptrace_stop that hits if the thread is not ptraced. However, there is no synchronization between a thread deciding to do a ptrace stop and so going here, and its ptracer dying and so detaching from it and clearing its ->ptrace field. The RHEL3 2.4-based kernel has a backport of a slightly older version of the 2.6 signals code, which has a different but equivalent BUG_ON. This actually bit users in practice (when the debugger dies), but was exceedingly difficult to reproduce in contrived circumstances. We moved forward in RHEL3 just by removing the BUG_ON, and that fixed the real user problems even though I was never able to reproduce the scenario myself. So, to my knowledge this scenario has never actually been seen in practice under 2.6. But it's plain to see from the code that it is indeed possible. This patch removes that BUG_ON, but also goes further and tries to handle this case more gracefully than simply avoiding the crash. By removing the BUG_ON alone, it becomes possible for the real parent of a process to see spurious SIGCHLD notifications intended for the debugger that has just died, and have its child wind up stopped unexpectedly. This patch avoids that possibility by detecting the case when we are about to do the ptrace stop but our ptracer has gone away, and simply eliding that ptrace stop altogether as if we hadn't been ptraced when we hit the interesting event (signal or ptrace_notify call for syscall tracing or something like that). Signed-off-by:
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Roland McGrath authored
After my last change, there are plenty of unused bits available in the new flags word in signal_struct. This patch moves the `group_exit' flag into one of those bits, saving a word in signal_struct. Signed-off-by:
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Roland McGrath authored
The `sig_avoid_stop_race' checks fail to catch a related race scenario that can happen. I don't think this has been seen in nature, but it could happen in the same sorts of situations where the observed problems come up that those checks work around. This patch takes a different approach to catching this race condition. The new approach plugs the hole, and I think is also cleaner. The issue is a race between one CPU processing a stop signal while another CPU processes a SIGCONT or SIGKILL. There is a window in stop-signal processing where the siglock must be released. If a SIGCONT or SIGKILL comes along here on another CPU, then the stop signal in the midst of being processed needs to be discarded rather than having the stop take place after the SIGCONT or SIGKILL has been generated. The existing workaround checks for this case explicitly by looking for a pending SIGCONT or SIGKILL after reacquiring the lock. However, there is another problem related to the same race issue. In the window where the processing of the stop signal has released the siglock, the stop signal is not represented in the pending set any more, but it is still "pending" and not "delivered" in POSIX terms. The SIGCONT coming in this window is required to clear all pending stop signals. But, if a stop signal has been dequeued but not yet processed, the SIGCONT generation will fail to clear it (in handle_stop_signal). Likewise, a SIGKILL coming here should prevent the stop processing and make the thread die immediately instead. The `sig_avoid_stop_race' code checks for this by examining the pending set to see if SIGCONT or SIGKILL is in it. But this fails to handle the case where another CPU running another thread in the same process has already dequeued the signal (so it no longer can be found in the pending set). We must catch this as well, so that the same problems do not arise when another thread on another CPU acted real fast. I've fixed this dumping the `sig_avoid_stop_race' kludge in favor of a little explicit bookkeeping. Now, dequeuing any stop signal sets a flag saying that a pending stop signal has been taken on by some CPU since the last time all pending stop signals were cleared due to SIGCONT/SIGKILL. The processing of stop signals checks the flag after the window where it released the lock, and abandons the signal the flag has been cleared. The code that clears pending stop signals on SIGCONT generation also clears this flag. The various places that are trying to ensure the process dies quickly (SIGKILL or other unhandled signals) also clear the flag. I've made this a general flags word in signal_struct, and replaced the stop_state field with flag bits in this word. Signed-off-by:
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Coywolf Qi Hunt authored
Peter Chubb recently split out a standalone sys_ni.c file for the not implemented syscalls. This patch removes the redundant sys_delete_module() in module.c. Signed-off-by:
Coywolf Qi Hunt <coywolf@gmail.com> Signed-off-by:
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Oleg Nesterov authored
cpu_idle() is referenced from generic code (init/main.c). It is declared/defined in init/main.c: void cpu_idle(void) i386/kernel/process.c void cpu_idle(void) i386/kernel/smpboot.c: int cpu_idle(void) i386/mach-voyager/voyager_smp.c: int cpu_idle(void) ppc/kernel/idle.c: int cpu_idle(void) ppc/kernel/smp.c: int cpu_idle(void *unused) ppc64/kernel/idle.c: int cpu_idle(void) ppc64/kernel/smp.c: int cpu_idle(void *unused) sparc/kernel/process.c: int cpu_idle(void) sparc64/kernel/process.c: int cpu_idle(void) sh/kernel/process.c: void cpu_idle(void *unused) sh/kernel/smp.c: int cpu_idle(void *unused) ia64/kernel/smpboot.c: int cpu_idle(void) ia64/kernel/process.c: void cpu_idle(void *unused) sh64/kernel/process.c: void cpu_idle(void *unused) s390/kernel/process.c: int cpu_idle(void) s390/kernel/smp.c: int cpu_idle(void * unused) m32r/kernel/process.c: void cpu_idle(void) m32r/kernel/smpboot.c int cpu_idle(void) Other arches beleive that cpu_idle is void(void). This patch puts 'void cpu_idle(void)' in include/linux/smp.h and fixes conflicting definitions. Also removes now unneeded declarations in x86_64, alpha, parisc. Only i386 part is tested. Signed-off-by:
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