- 22 Jun, 2006 5 commits
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Oleg Drokin authored
It seems there is error check missing in open_namei for errors returned through intent.open.file (from lookup_instantiate_filp). If there is plain open performed, then such a check done inside __path_lookup_intent_open called from path_lookup_open(), but when the open is performed with O_CREAT flag set, then __path_lookup_intent_open is only called with LOOKUP_PARENT set where no file opening can occur yet. Later on lookup_hash is called where exact opening might take place and intent.open.file may be filled. If it is filled with error value of some sort, then we get kernel attempting to dereference this error value as address (and corresponding oops) in nameidata_to_filp() called from filp_open(). While this is relatively simple to workaround in ->lookup() method by just checking lookup_instantiate_filp() return value and returning error as needed, this is not so easy in ->d_revalidate(), where we can only return "yes, dentry is valid" or "no, dentry is invalid, perform full lookup again", and just returning 0 on error would cause extra lookup (with potential extra costly RPCs). So in short, I believe that there should be no difference in error handling for opening a file and creating a file in open_namei() and propose this simple patch as a solution. Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@suse.de>
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David Miller authored
Both csum_partial() and the csum_partial_copy*() family of routines forget to do a final fold on the computed checksum value on sparc64. So do the standard Sparc "add + set condition codes, add carry" sequence, then make sure the high 32-bits of the return value are clear. Based upon some excellent detective work and debugging done by Richard Braun and Samuel Thibault. Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
Chris Wright <chrisw@sous-sol.org> Signed-off-by:
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David Miller authored
Using asm-generic/dma-mapping.h does not work because pushing the call down to pci_alloc_coherent() causes the gfp_t argument of dma_alloc_coherent() to be ignored. Fix this by implementing things directly, and adding a gfp_t argument we can use in the internal call down to the PCI DMA implementation of pci_alloc_coherent(). This fixes massive memory corruption when using the sound driver layer, which passes things like __GFP_COMP down into these routines and (correctly) expects that to work. This is a disk eater when sound is used, so it's pretty critical. Signed-off-by:
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David Miller authored
If we move a mapping from one virtual address to another, and this changes the virtual color of the mapping to those pages, we can see corrupt data due to D-cache aliasing. Check for and deal with this by overriding the move_pte() macro. Set things up so that other platforms can cleanly override the move_pte() macro too. This long standing bug corrupts user memory, and in particular has been notorious for corrupting Debian package database files on sparc64 boxes. Signed-off-by:
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Stuart MacDonald authored
Attached patch fixes spurious errors during firmware load. Signed-off-by:
Stuart MacDonald <stuartm@connecttech.com> Signed-off-by:
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- 20 Jun, 2006 5 commits
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Chris Wright authored
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Patrick McHardy authored
Fix endless loop in the SCTP match similar to those already fixed in the SCTP conntrack helper (was CVE-2006-1527). Signed-off-by:
Patrick McHardy <kaber@trash.net> Signed-off-by:
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Oleg Nesterov authored
do_exit() clears ->it_##clock##_expires, but nothing prevents another cpu to attach the timer to exiting process after that. arm_timer() tries to protect against this race, but the check is racy. After exit_notify() does 'write_unlock_irq(&tasklist_lock)' and before do_exit() calls 'schedule() local timer interrupt can find tsk->exit_state != 0. If that state was EXIT_DEAD (or another cpu does sys_wait4) interrupted task has ->signal == NULL. At this moment exiting task has no pending cpu timers, they were cleanuped in __exit_signal()->posix_cpu_timers_exit{,_group}(), so we can just return from irq. John Stultz recently confirmed this bug, see http://marc.theaimsgroup.com/?l=linux-kernel&m=115015841413687Signed-off-by:Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by:
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Oleg Nesterov authored
If the local timer interrupt happens just after do_exit() sets PF_EXITING (and before it clears ->it_xxx_expires) run_posix_cpu_timers() will call check_process_timers() with tasklist_lock + ->siglock held and check_process_timers: t = tsk; do { .... do { t = next_thread(t); } while (unlikely(t->flags & PF_EXITING)); } while (t != tsk); the outer loop will never stop. Actually, the window is bigger. Another process can attach the timer after ->it_xxx_expires was cleared (see the next commit) and the 'if (PF_EXITING)' check in arm_timer() is racy (see the one after that). Signed-off-by: -
Paul Mackerras authored
This fixes a bug found by Dave Jones that means that it is possible for userspace to provoke a machine check on 32-bit kernels. This also fixes a couple of other places where I found similar problems by inspection. Signed-off-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
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- 05 Jun, 2006 13 commits
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Chris Wright authored
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Stefan Richter authored
I added a failure check in patch "sbp2: variable status FIFO address (fix login timeout)" --- alas for a wrong error value. This is a bug since Linux 2.6.16. Leads to NULL pointer dereference if the call failed, and bogus failure handling if call succeeded. Signed-off-by:
Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by:
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Stefan Richter authored
There is a firmware bug in several Apple iPods which prevents access to these iPods under certain conditions. The disk size reported by the iPod is one sector too big. Once access to the end of the disk is attempted, the iPod becomes inaccessible. This problem has been known for USB iPods for some time and has recently been discovered to exist with FireWire/USB combo iPods too. This patch is derived from the fix in Linux 2.6.17, commit e9a1c52c, to be applicable to 2.6.16.x without prerequisite patches. It hard-wires a workaround for three known affected model numbers (those of 4th generation iPod, iPod Photo, iPod mini). Note: This patch lacks Linux 2.6.17's ability to enable and disable the workaround via a module parameter. Signed-off-by:
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Andi Kleen authored
This fixes a regression from the earlier DOS fix for non canonical IRET addresses. It broke UML. int_ret_from_syscall already does syscall exit tracing, so no need to do it again in the caller. This caused problems for UML and some other special programs doing syscall interception. Signed-off-by:
Andi Kleen <ak@suse.de> Signed-off-by:
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Vivek Goyal authored
o Start booting into the capture kernel after an Oops if system is in a unrecoverable state. System will boot into the capture kernel, if one is pre-loaded by the user, and capture the kernel core dump. o One of the following conditions should be true to trigger the booting of capture kernel. - panic_on_oops is set. - pid of current thread is 0 - pid of current thread is 1 - Oops happened inside interrupt context. Signed-off-by:Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by:
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Zhu Yi authored
Currently iwlist ethX freq[uency]/channel lists all the channels the card supported for the current region, which includes some channels can only be used in infrastructure mode. This patch filters these channels out if the card is currently in ad-hoc mode. Signed-off-by:
Zhu Yi <yi.zhu@intel.com> Signed-off-by:
John W. Linville <linville@tuxdriver.com> Signed-off-by:
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Mark Lord authored
Okay, just to sum things up. This forces libata to wait for up to 2 seconds for BUSY|DRQ to clear on resume before continuing. [jgarzik adds...] During testing we never saw DRQ asserted, but nonetheless (a) this works and (b) testing for DRQ won't hurt. Signed-off-by:
Mark Lord <liml@rtr.ca> Acked-by:
Jens Axboe <axboe@suse.de> Signed-off-by:
Jeff Garzik <jeff@garzik.org> Signed-off-by:
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Stefan Richter authored
Re-enable posted writes for status FIFO. Besides bringing back a very minor bandwidth tweak from Linux 2.6.15.x and older, this also fixes an interoperability regression since 2.6.16: http://bugzilla.kernel.org/show_bug.cgi?id=6356 (sbp2: scsi_add_device failed. IEEE1394 HD is not working anymore.) Signed-off-by:
Vanei Heidemann <linux@javanei.com.br> Tested-by: Martin Putzlocher <mputzi@gmx.de> (chip type unconfirmed) Signed-off-by:
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Dmitry Torokhov authored
Input: psmouse - fix new device detection logic Reported to fix http://bugs.gentoo.org/130846Signed-off-by:
Dmitry Torokhov <dtor@mail.ru> Cc: Daniel Drake <dsd@gentoo.org> Signed-off-by:
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Johannes Berg authored
For a very long time, echoing 'standby' or 'mem' into /sys/power/state has killed the machine on powerpc. This patch fixes that. This patch adds the .valid callback to pm_ops on PowerMac so that only the suspend to disk state can be entered. Note that just returning 0 would suffice since the upper layers don't pass PM_SUSPEND_DISK down, but we handle it there regardless just in case that changes. Acked-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by:
Johannes Berg <johannes@sipsolutions.net> Cc: <stable@kernel.org> Signed-off-by:
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Paul Jackson authored
Fix an infrequently encountered 'sleeping function called from invalid context' in the cpuset hooks in __alloc_pages. Could sleep while interrupts disabled. The routine cpuset_zone_allowed() is called by code in mm/page_alloc.c __alloc_pages() to determine if a zone is allowed in the current tasks cpuset. This routine can sleep, for certain GFP_KERNEL allocations, if the zone is on a memory node not allowed in the current cpuset, but might be allowed in a parent cpuset. But we can't sleep in __alloc_pages() if in interrupt, nor if called for a GFP_ATOMIC request (__GFP_WAIT not set in gfp_flags). The rule was intended to be: Don't call cpuset_zone_allowed() if you can't sleep, unless you pass in the __GFP_HARDWALL flag set in gfp_flag, which disables the code that might scan up ancestor cpusets and sleep. This rule was being violated due to a bogus change made (by myself, pj) to __alloc_pages() as part of the November 2005 effort to cleanup its logic. The bogus change can be seen at: http://linux.derkeiler.com/Mailing-Lists/Kernel/2005-11/4691.html [PATCH 01/05] mm fix __alloc_pages cpuset ALLOC_* flags This was first noticed on a tight memory system, in code that was disabling interrupts and doing allocation requests with __GFP_WAIT not set, which resulted in __might_sleep() writing complaints to the log "Debug: sleeping function called ...", when the code in cpuset_zone_allowed() tried to take the callback_sem cpuset semaphore. Special thanks to Dave Chinner, for figuring this out, and a tip of the hat to Nick Piggin who warned me of this back in Nov 2005, before I was ready to listen. Signed-off-by:
Paul Jackson <pj@sgi.com> Signed-off-by:
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Pat Gefre authored
Currently loading the ioc3 as a module will cause the ports to be numbered in reverse order. This mod maintains the proper order of cards for port numbering. Signed-off-by:
Patrick Gefre <pfg@sgi.com> Signed-off-by:
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Brent Casavant authored
Currently loading the ioc4 as a module will cause the ports to be numbered in reverse order. This mod maintains the proper order of cards for port numbering. Signed-off-by:
Brent Casavant <bcasavan@sgi.com> Cc: Pat Gefre <pfg@sgi.com> Signed-off-by:
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- 31 May, 2006 2 commits
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Chris Wright authored
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Marcel Holtmann authored
It appears that sockaddr_in.sin_zero is not zeroed during getsockopt(...SO_ORIGINAL_DST...) operation. This can lead to an information leak (CVE-2006-1343). Signed-off-by:
Marcel Holtmann <marcel@holtmann.org> Signed-off-by:
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- 22 May, 2006 2 commits
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Chris Wright authored
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Patrick McHardy authored
CVE-2006-2444 - Potential remote DoS in SNMP NAT helper. Fix memory corruption caused by snmp_trap_decode: - When snmp_trap_decode fails before the id and address are allocated, the pointers contain random memory, but are freed by the caller (snmp_parse_mangle). - When snmp_trap_decode fails after allocating just the ID, it tries to free both address and ID, but the address pointer still contains random memory. The caller frees both ID and random memory again. - When snmp_trap_decode fails after allocating both, it frees both, and the callers frees both again. The corruption can be triggered remotely when the ip_nat_snmp_basic module is loaded and traffic on port 161 or 162 is NATed. Found by multiple testcases of the trap-app and trap-enc groups of the PROTOS c06-snmpv1 testsuite. Signed-off-by:
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- 20 May, 2006 13 commits
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Chris Wright authored
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Vladislav Yasevich authored
If SCTP receives a badly formatted HB-ACK chunk, it is possible that we may access invalid memory and potentially have a buffer overflow. We should really make sure that the chunk format is what we expect, before attempting to touch the data. Signed-off-by:
Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by:
Sridhar Samudrala <sri@us.ibm.com> Signed-off-by:
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Vladislav Yasevich authored
When performing bound checks during the parameter processing, we want to use the real chunk and paramter lengths for bounds instead of the rounded ones. This prevents us from potentially walking of the end if the chunk length was miscalculated. We still use rounded lengths when advancing the pointer. This was found during a conformance test that changed the chunk length without modifying parameters. (Vlad noted elsewhere: the most you'd overflow is 3 bytes, so problem is parameter dependent). Signed-off-by:
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Linus Torvalds authored
Eric Biederman points out that we can't take the task_lock while holding tasklist_lock for writing, because another CPU that holds the task lock might take an interrupt that then tries to take tasklist_lock for writing. Which would be a nasty deadlock, with one CPU spinning forever in an interrupt handler (although admittedly you need to really work at triggering it ;) Since the ptrace_attach() code is special and very unusual, just make it be extra careful, and use trylock+repeat to avoid the possible deadlock. Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Roland McGrath <roland@redhat.com> Signed-off-by:
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Linus Torvalds authored
This holds the task lock (and, for ptrace_attach, the tasklist_lock) over the actual attach event, which closes a race between attacking to a thread that is either doing a PTRACE_TRACEME or getting de-threaded. Thanks to Oleg Nesterov for reminding me about this, and Chris Wright for noticing a lost return value in my first version. Signed-off-by:
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Christoph Lameter authored
Currently we check PageDirty() in order to make the decision to swap out the page. However, the dirty information may be only be contained in the ptes pointing to the page. We need to first unmap the ptes before checking for PageDirty(). If unmap is successful then the page count of the page will also be decreased so that pageout() works properly. This is a fix necessary for 2.6.17. Without this fix we may migrate dirty pages for filesystems without migration functions. Filesystems may keep pointers to dirty pages. Migration of dirty pages can result in the filesystem keeping pointers to freed pages. Unmapping is currently not be separated out from removing all the references to a page and moving the mapping. Therefore try_to_unmap will be called again in migrate_page() if the writeout is successful. However, it wont do anything since the ptes are already removed. The coming updates to the page migration code will restructure the code so that this is no longer necessary. Signed-off-by:
Christoph Lameter <clameter@sgi.com> Signed-off-by:
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Lee Schermerhorn authored
Basic problem: pages of a shared memory segment can only be migrated once. In 2.6.16 through 2.6.17-rc1, shared memory mappings do not have a migratepage address space op. Therefore, migrate_pages() falls back to default processing. In this path, it will try to pageout() dirty pages. Once a shared memory page has been migrated it becomes dirty, so migrate_pages() will try to page it out. However, because the page count is 3 [cache + current + pte], pageout() will return PAGE_KEEP because is_page_cache_freeable() returns false. This will abort all subsequent migrations. This patch adds a migratepage address space op to shared memory segments to avoid taking the default path. We use the "migrate_page()" function because it knows how to migrate dirty pages. This allows shared memory segment pages to migrate, subject to other conditions such as # pte's referencing the page [page_mapcount(page)], when requested. I think this is safe. If we're migrating a shared memory page, then we found the page via a page table, so it must be in memory. Can be verified with memtoy and the shmem-mbind-test script, both available at: http://free.linux.hp.com/~lts/Tools/Signed-off-by:
Lee Schermerhorn <lee.schermerhorn@hp.com> Acked-by:
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Christoph Lameter authored
gather_stats() is called with a spinlock held from check_pte_range. We cannot reschedule with a lock held. Signed-off-by:
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Chris Wedgwood authored
An earlier commit (75cf7456) changed an overly-zealous PCI quirk to only poke those VIA devices that need it. However, some PCI devices were not included in what I hope is now the full list. Consequently we're failing to run the quirk on all machines which need it, causing IRQ routing failures. This should I hope correct this. Thanks to Masoud Sharbiani <masouds@masoud.ir> for pointing this out and testing the fix. Signed-off-by:
Chris Wedgwood <cw@f00f.org> Signed-off-by:
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Chris Wedgwood authored
Alan Cox pointed out that the VIA 'IRQ fixup' was erroneously running on my system which has no VIA southbridge (but I do have a VIA IEEE 1394 device). This should address that. I also changed "Via IRQ" to "VIA IRQ" (initially I read Via as a capitalized via (by way/means of). Signed-off-by:
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Harald Welte authored
This patch corrects the order of the calls to register_chrdev() and pcmcia_register_driver(). Now udev correctly creates userspace device files /dev/cmmN and /dev/cmxN respectively. Based on an earlier patch by Jan Niehusmann <jan@gondor.com>. Signed-off-by:
Harald Welte <laforge@netfilter.org> Signed-off-by:
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Jens Axboe authored
Don't recurse back into the driver even if the unplug threshold is met, when the driver asks for a requeue. This is both silly from a logical point of view (requeues typically happen due to driver/hardware shortage), and also dangerous since we could hit an endless request_fn -> requeue -> unplug -> request_fn loop and crash on stack overrun. Also limit blk_run_queue() to one level of recursion, similar to how blk_start_queue() works. This patch fixed a real problem with SLES10 and lpfc, and it could hit any SCSI lld that returns non-zero from it's ->queuecommand() handler. Signed-off-by:
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Kristen Accardi authored
The OSC set and query functions do not allocate enough space for return values, and set the output buffer length to a false, too large value. This causes the acpi-ca code to assume that the output buffer is larger than it actually is, and overwrite memory when copying acpi return buffers into this caller provided buffer. In some cases this can cause kernel oops if the memory that is overwritten is a pointer. This patch will change these calls to use a dynamically allocated output buffer, thus allowing the acpi-ca code to decide how much space is needed. Signed-off-by:
Kristen Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by:
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