- 18 Mar, 2015 11 commits
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Alexander Drozdov authored
[ Upstream commit fba04a9e ] skb_copy_bits() returns zero on success and negative value on error, so it is needed to invert the condition in ip_check_defrag(). Fixes: 1bf3751e ("ipv4: ip_check_defrag must not modify skb before unsharing") Signed-off-by:
Alexander Drozdov <al.drozdov@gmail.com> Acked-by:
Eric Dumazet <edumazet@google.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ignacy Gawędzki authored
[ Upstream commit 1c4cff0c ] The gnet_stats_copy_app() function gets called, more often than not, with its second argument a pointer to an automatic variable in the caller's stack. Therefore, to avoid copying garbage afterwards when calling gnet_stats_finish_copy(), this data is better copied to a dynamically allocated memory that gets freed after use. [xiyou.wangcong@gmail.com: remove a useless kfree()] Signed-off-by:
Ignacy Gawędzki <ignacy.gawedzki@green-communications.fr> Signed-off-by:
Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by:
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WANG Cong authored
[ Upstream commit 7afb8886 ] Ignacy reported that when eth0 is down and add a vlan device on top of it like: ip link add link eth0 name eth0.1 up type vlan id 1 We will get a refcount leak: unregister_netdevice: waiting for eth0.1 to become free. Usage count = 2 The problem is when rtnl_configure_link() fails in rtnl_newlink(), we simply call unregister_device(), but for stacked device like vlan, we almost do nothing when we unregister the upper device, more work is done when we unregister the lower device, so call its ->dellink(). Reported-by:
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Martin KaFai Lau authored
[ Upstream commit 3b471175 ] ipv6_cow_metrics() currently assumes only DST_HOST routes require dynamic metrics allocation from inetpeer. The assumption breaks when ndisc discovered router with RTAX_MTU and RTAX_HOPLIMIT metric. Refer to ndisc_router_discovery() in ndisc.c and note that dst_metric_set() is called after the route is created. This patch creates the metrics array (by calling dst_cow_metrics_generic) in ipv6_cow_metrics(). Test: radvd.conf: interface qemubr0 { AdvLinkMTU 1300; AdvCurHopLimit 30; prefix fd00:face:face:face::/64 { AdvOnLink on; AdvAutonomous on; AdvRouterAddr off; }; }; Before: [root@qemu1 ~]# ip -6 r show | egrep -v unreachable fd00:face:face:face::/64 dev eth0 proto kernel metric 256 expires 27sec fe80::/64 dev eth0 proto kernel metric 256 default via fe80::74df:d0ff:fe23:8ef2 dev eth0 proto ra metric 1024 expires 27sec After: [root@qemu1 ~]# ip -6 r show | egrep -v unreachable fd00:face:face:face::/64 dev eth0 proto kernel metric 256 expires 27sec mtu 1300 fe80::/64 dev eth0 proto kernel metric 256 mtu 1300 default via fe80::74df:d0ff:fe23:8ef2 dev eth0 proto ra metric 1024 expires 27sec mtu 1300 hoplimit 30 Fixes: 8e2ec639 (ipv6: don't use inetpeer to store metrics for routes.) Signed-off-by:
Martin KaFai Lau <kafai@fb.com> Signed-off-by:
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Eric Dumazet authored
[ Upstream commit ba34e6d9 ] IPv6 can keep a copy of SYN message using skb_get() in tcp_v6_conn_request() so that caller wont free the skb when calling kfree_skb() later. Therefore TCP fast open has to clone the skb it is queuing in child->sk_receive_queue, as all skbs consumed from receive_queue are freed using __kfree_skb() (ie assuming skb->users == 1) Signed-off-by:
Yuchung Cheng <ycheng@google.com> Fixes: 5b7ed089 ("tcp: move fastopen functions to tcp_fastopen.c") Signed-off-by:
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Vlad Yasevich authored
[ Upstream commit 8381eacf ] Make __ipv6_select_ident() static as it isn't used outside the file. Fixes: 0508c07f (ipv6: Select fragment id during UFO segmentation if not set.) Signed-off-by:
Vladislav Yasevich <vyasevic@redhat.com> Signed-off-by:
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Vlad Yasevich authored
[ Upstream commit 51f30770 ] Recent commit: 0508c07f Author: Vlad Yasevich <vyasevich@gmail.com> Date: Tue Feb 3 16:36:15 2015 -0500 ipv6: Select fragment id during UFO segmentation if not set. Introduced a bug on LE in how ipv6 fragment id is assigned. This was cought by nightly sparce check: Resolve the following sparce error: net/ipv6/output_core.c:57:38: sparse: incorrect type in assignment (different base types) net/ipv6/output_core.c:57:38: expected restricted __be32 [usertype] ip6_frag_id net/ipv6/output_core.c:57:38: got unsigned int [unsigned] [assigned] [usertype] id Fixes: 0508c07f (ipv6: Select fragment id during UFO segmentation if not set.) Signed-off-by:
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Daniel Borkmann authored
[ Upstream commit 364d5716 ] ifla_vf_policy[] is wrong in advertising its individual member types as NLA_BINARY since .type = NLA_BINARY in combination with .len declares the len member as *max* attribute length [0, len]. The issue is that when do_setvfinfo() is being called to set up a VF through ndo handler, we could set corrupted data if the attribute length is less than the size of the related structure itself. The intent is exactly the opposite, namely to make sure to pass at least data of minimum size of len. Fixes: ebc08a6f ("rtnetlink: Add VF config code to rtnetlink") Cc: Mitch Williams <mitch.a.williams@intel.com> Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Acked-by:
Thomas Graf <tgraf@suug.ch> Signed-off-by:
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Sabrina Dubroca authored
[ Upstream commit 7744b5f3 ] This patch fixes two issues in UDP checksum computation in pktgen. First, the pseudo-header uses the source and destination IP addresses. Currently, the ports are used for IPv4. Second, the UDP checksum covers both header and data. So we need to generate the data earlier (move pktgen_finalize_skb up), and compute the checksum for UDP header + data. Fixes: c26bf4a5 ("pktgen: Add UDPCSUM flag to support UDP checksums") Signed-off-by:
Sabrina Dubroca <sd@queasysnail.net> Acked-by:
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Daniel Borkmann authored
[ Upstream commit 11b1f828 ] We still need a validate_link_af() handler with an appropriate nla policy, similarly as we have in IPv4 case, otherwise size validations are not being done properly in that case. Fixes: f53adae4 ("net: ipv6: add tokenized interface identifier support") Fixes: bc91b0f0 ("ipv6: addrconf: implement address generation modes") Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by:
Jiri Pirko <jiri@resnulli.us> Signed-off-by:
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Miroslav Urbanek authored
[ Upstream commit 233c96fc ] flow_cache_flush_task references a structure member flow_cache_gc_work where it should reference flow_cache_flush_task instead. Kernel panic occurs on kernels using IPsec during XFRM garbage collection. The garbage collection interval can be shortened using the following sysctl settings: net.ipv4.xfrm4_gc_thresh=4 net.ipv6.xfrm6_gc_thresh=4 With the default settings, our productions servers crash approximately once a week. With the settings above, they crash immediately. Fixes: ca925cf1 ("flowcache: Make flow cache name space aware") Reported-by:
Tomáš Charvát <tc@excello.cz> Tested-by:
Jan Hejl <jh@excello.cz> Signed-off-by:
Miroslav Urbanek <mu@miroslavurbanek.com> Acked-by:
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- 06 Mar, 2015 29 commits
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Greg Kroah-Hartman authored
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Christian Borntraeger authored
commit 5ee07612 upstream. ACCESS_ONCE does not work reliably on non-scalar types. For example gcc 4.6 and 4.7 might remove the volatile tag for such accesses during the SRA (scalar replacement of aggregates) step (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145) Change the ppc/kvm code to replace ACCESS_ONCE with READ_ONCE. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Acked-by:
Alexander Graf <agraf@suse.de> Signed-off-by:
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Christian Borntraeger authored
commit da1a288d upstream. ACCESS_ONCE does not work reliably on non-scalar types. For example gcc 4.6 and 4.7 might remove the volatile tag for such accesses during the SRA (scalar replacement of aggregates) step (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145) Change the ppc/hugetlbfs code to replace ACCESS_ONCE with READ_ONCE. Signed-off-by:
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Christian Borntraeger authored
commit 38c5ce93 upstream. ACCESS_ONCE does not work reliably on non-scalar types. For example gcc 4.6 and 4.7 might remove the volatile tag for such accesses during the SRA (scalar replacement of aggregates) step (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145) Fixup gup_pmd_range. Signed-off-by:
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Guenter Roeck authored
commit 378af02b upstream. Commit 927609d6 ("kernel: tighten rules for ACCESS ONCE") results in a compile failure for sh builds with CONFIG_X2TLB enabled. arch/sh/mm/gup.c: In function 'gup_get_pte': arch/sh/mm/gup.c:20:2: error: invalid initializer make[1]: *** [arch/sh/mm/gup.o] Error 1 Replace ACCESS_ONCE with READ_ONCE to fix the problem. Fixes: 927609d6 ("kernel: tighten rules for ACCESS ONCE") Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
Guenter Roeck <linux@roeck-us.net> Reviewed-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by:
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Jan Kara authored
commit b10a0819 upstream. Currently maximum space limit quota format supports is in blocks however since we store space limits in bytes, this is somewhat confusing. So store the maximum limit in bytes as well. Also rename the field to match the new unit and related inode field to match the new naming scheme. Reviewed-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
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Christian Borntraeger authored
commit 1760f1eb upstream. ACCESS_ONCE does not work reliably on non-scalar types. For example gcc 4.6 and 4.7 might remove the volatile tag for such accesses during the SRA (scalar replacement of aggregates) step (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145) Change the p2m code to replace ACCESS_ONCE with READ_ONCE. Signed-off-by:
Juergen Gross <jgross@suse.com> Acked-by:
David Vrabel <david.vrabel@citrix.com> Signed-off-by:
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Raghavendra K T authored
commit d6abfdb2 upstream. Paravirt spinlock clears slowpath flag after doing unlock. As explained by Linus currently it does: prev = *lock; add_smp(&lock->tickets.head, TICKET_LOCK_INC); /* add_smp() is a full mb() */ if (unlikely(lock->tickets.tail & TICKET_SLOWPATH_FLAG)) __ticket_unlock_slowpath(lock, prev); which is *exactly* the kind of things you cannot do with spinlocks, because after you've done the "add_smp()" and released the spinlock for the fast-path, you can't access the spinlock any more. Exactly because a fast-path lock might come in, and release the whole data structure. Linus suggested that we should not do any writes to lock after unlock(), and we can move slowpath clearing to fastpath lock. So this patch implements the fix with: 1. Moving slowpath flag to head (Oleg): Unlocked locks don't care about the slowpath flag; therefore we can keep it set after the last unlock, and clear it again on the first (try)lock. -- this removes the write after unlock. note that keeping slowpath flag would result in unnecessary kicks. By moving the slowpath flag from the tail to the head ticket we also avoid the need to access both the head and tail tickets on unlock. 2. use xadd to avoid read/write after unlock that checks the need for unlock_kick (Linus): We further avoid the need for a read-after-release by using xadd; the prev head value will include the slowpath flag and indicate if we need to do PV kicking of suspended spinners -- on modern chips xadd isn't (much) more expensive than an add + load. Result: setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) benchmark overcommit %improve kernbench 1x -0.13 kernbench 2x 0.02 dbench 1x -1.77 dbench 2x -0.63 [Jeremy: Hinted missing TICKET_LOCK_INC for kick] [Oleg: Moved slowpath flag to head, ticket_equals idea] [PeterZ: Added detailed changelog] Suggested-by:
Linus Torvalds <torvalds@linux-foundation.org> Reported-by:
Sasha Levin <sasha.levin@oracle.com> Tested-by:
Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by:
Oleg Nesterov <oleg@redhat.com> Cc: Andrew Jones <drjones@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Christoph Lameter <cl@linux.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dave Jones <davej@redhat.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Fernando Luis Vázquez Cao <fernando_b1@lab.ntt.co.jp> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Ulrich Obergfell <uobergfe@redhat.com> Cc: Waiman Long <Waiman.Long@hp.com> Cc: a.ryabinin@samsung.com Cc: dave@stgolabs.net Cc: hpa@zytor.com Cc: jasowang@redhat.com Cc: jeremy@goop.org Cc: paul.gortmaker@windriver.com Cc: riel@redhat.com Cc: tglx@linutronix.de Cc: waiman.long@hp.com Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/20150215173043.GA7471@linux.vnet.ibm.comSigned-off-by:
Ingo Molnar <mingo@kernel.org> Signed-off-by:
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Linus Torvalds authored
commit dd369297 upstream. The use of READ_ONCE() causes lots of warnings witht he pending paravirt spinlock fixes, because those ends up having passing a member to a 'const' structure to READ_ONCE(). There should certainly be nothing wrong with using READ_ONCE() with a const source, but the helper function __read_once_size() would cause warnings because it would drop the 'const' qualifier, but also because the destination would be marked 'const' too due to the use of 'typeof'. Use a union of types in READ_ONCE() to avoid this issue. Also make sure to use parenthesis around the macro arguments to avoid possible operator precedence issues. Tested-by:
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Christian Borntraeger authored
commit c5b19946 upstream. Commit 927609d6 ("kernel: tighten rules for ACCESS ONCE") results in sparse warnings like "Using plain integer as NULL pointer" - Let's add a type cast to the dummy assignment. To avoid warnings lik "sparse: warning: cast to restricted __hc32" we also use __force on that cast. Fixes: 927609d6 ("kernel: tighten rules for ACCESS ONCE") Signed-off-by:
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Christian Borntraeger authored
commit 927609d6 upstream. Now that all non-scalar users of ACCESS_ONCE have been converted to READ_ONCE or ASSIGN once, lets tighten ACCESS_ONCE to only work on scalar types. This variant was proposed by Alexei Starovoitov. Signed-off-by:
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Andy Shevchenko authored
commit 1b43d712 upstream. pmc_dbgfs_unregister() will be called when pmc->dbgfs_dir is unconditionally NULL on error path in pmc_dbgfs_register(). To prevent this we move the assignment to where is should be. Fixes: f855911c (x86/pmc_atom: Expose PMC device state and platform sleep state) Reported-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Aubrey Li <aubrey.li@linux.intel.com> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: Kumar P. Mahesh <mahesh.kumar.p@intel.com> Link: http://lkml.kernel.org/r/1421253575-22509-2-git-send-email-andriy.shevchenko@linux.intel.comSigned-off-by:
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Jiang Liu authored
commit 1ea76fba upstream. Commit b568b860 ("Treat SCI interrupt as normal GSI interrupt") accidently removes support of legacy PIC interrupt when fixing a regression for Xen, which causes a nasty regression on HP/Compaq nc6000 where we fail to register the ACPI interrupt, and thus lose eg. thermal notifications leading a potentially overheated machine. So reintroduce support of legacy PIC based ACPI SCI interrupt. Reported-by:
Ville Syrjälä <syrjala@sci.fi> Tested-by:
Jiang Liu <jiang.liu@linux.intel.com> Signed-off-by:
Pavel Machek <pavel@ucw.cz> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Len Brown <len.brown@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Sander Eikelenboom <linux@eikelenboom.it> Cc: linux-pm@vger.kernel.org Link: http://lkml.kernel.org/r/1424052673-22974-1-git-send-email-jiang.liu@linux.intel.comSigned-off-by:
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Hector Marco-Gisbert authored
commit 4e7c22d4 upstream. The issue is that the stack for processes is not properly randomized on 64 bit architectures due to an integer overflow. The affected function is randomize_stack_top() in file "fs/binfmt_elf.c": static unsigned long randomize_stack_top(unsigned long stack_top) { unsigned int random_variable = 0; if ((current->flags & PF_RANDOMIZE) && !(current->personality & ADDR_NO_RANDOMIZE)) { random_variable = get_random_int() & STACK_RND_MASK; random_variable <<= PAGE_SHIFT; } return PAGE_ALIGN(stack_top) + random_variable; return PAGE_ALIGN(stack_top) - random_variable; } Note that, it declares the "random_variable" variable as "unsigned int". Since the result of the shifting operation between STACK_RND_MASK (which is 0x3fffff on x86_64, 22 bits) and PAGE_SHIFT (which is 12 on x86_64): random_variable <<= PAGE_SHIFT; then the two leftmost bits are dropped when storing the result in the "random_variable". This variable shall be at least 34 bits long to hold the (22+12) result. These two dropped bits have an impact on the entropy of process stack. Concretely, the total stack entropy is reduced by four: from 2^28 to 2^30 (One fourth of expected entropy). This patch restores back the entropy by correcting the types involved in the operations in the functions randomize_stack_top() and stack_maxrandom_size(). The successful fix can be tested with: $ for i in `seq 1 10`; do cat /proc/self/maps | grep stack; done 7ffeda566000-7ffeda587000 rw-p 00000000 00:00 0 [stack] 7fff5a332000-7fff5a353000 rw-p 00000000 00:00 0 [stack] 7ffcdb7a1000-7ffcdb7c2000 rw-p 00000000 00:00 0 [stack] 7ffd5e2c4000-7ffd5e2e5000 rw-p 00000000 00:00 0 [stack] ... Once corrected, the leading bytes should be between 7ffc and 7fff, rather than always being 7fff. Signed-off-by:
Hector Marco-Gisbert <hecmargi@upv.es> Signed-off-by:
Ismael Ripoll <iripoll@upv.es> [ Rebased, fixed 80 char bugs, cleaned up commit message, added test example and CVE ] Signed-off-by:
Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Fixes: CVE-2015-1593 Link: http://lkml.kernel.org/r/20150214173350.GA18393@www.outflux.netSigned-off-by:
Borislav Petkov <bp@suse.de> Signed-off-by:
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Matt Fleming authored
commit 96738c69 upstream. Andy pointed out that if an NMI or MCE is received while we're in the middle of an EFI mixed mode call a triple fault will occur. This can happen, for example, when issuing an EFI mixed mode call while running perf. The reason for the triple fault is that we execute the mixed mode call in 32-bit mode with paging disabled but with 64-bit kernel IDT handlers installed throughout the call. At Andy's suggestion, stop playing the games we currently do at runtime, such as disabling paging and installing a 32-bit GDT for __KERNEL_CS. We can simply switch to the __KERNEL32_CS descriptor before invoking firmware services, and run in compatibility mode. This way, if an NMI/MCE does occur the kernel IDT handler will execute correctly, since it'll jump to __KERNEL_CS automatically. However, this change is only possible post-ExitBootServices(). Before then the firmware "owns" the machine and expects for its 32-bit IDT handlers to be left intact to service interrupts, etc. So, we now need to distinguish between early boot and runtime invocations of EFI services. During early boot, we need to restore the GDT that the firmware expects to be present. We can only jump to the __KERNEL32_CS code segment for mixed mode calls after ExitBootServices() has been invoked. A liberal sprinkling of comments in the thunking code should make the differences in early and late environments more apparent. Reported-by:
Andy Lutomirski <luto@amacapital.net> Tested-by:
Matt Fleming <matt.fleming@intel.com> Signed-off-by:
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Thadeu Lima de Souza Cascardo authored
commit 045c47ca upstream. When reading blkio.throttle.io_serviced in a recently created blkio cgroup, it's possible to race against the creation of a throttle policy, which delays the allocation of stats_cpu. Like other functions in the throttle code, just checking for a NULL stats_cpu prevents the following oops caused by that race. [ 1117.285199] Unable to handle kernel paging request for data at address 0x7fb4d0020 [ 1117.285252] Faulting instruction address: 0xc0000000003efa2c [ 1137.733921] Oops: Kernel access of bad area, sig: 11 [#1] [ 1137.733945] SMP NR_CPUS=2048 NUMA PowerNV [ 1137.734025] Modules linked in: bridge stp llc kvm_hv kvm binfmt_misc autofs4 [ 1137.734102] CPU: 3 PID: 5302 Comm: blkcgroup Not tainted 3.19.0 #5 [ 1137.734132] task: c000000f1d188b00 ti: c000000f1d210000 task.ti: c000000f1d210000 [ 1137.734167] NIP: c0000000003efa2c LR: c0000000003ef9f0 CTR: c0000000003ef980 [ 1137.734202] REGS: c000000f1d213500 TRAP: 0300 Not tainted (3.19.0) [ 1137.734230] MSR: 9000000000009032 <SF,HV,EE,ME,IR,DR,RI> CR: 42008884 XER: 20000000 [ 1137.734325] CFAR: 0000000000008458 DAR: 00000007fb4d0020 DSISR: 40000000 SOFTE: 0 GPR00: c0000000003ed3a0 c000000f1d213780 c000000000c59538 0000000000000000 GPR04: 0000000000000800 0000000000000000 0000000000000000 0000000000000000 GPR08: ffffffffffffffff 00000007fb4d0020 00000007fb4d0000 c000000000780808 GPR12: 0000000022000888 c00000000fdc0d80 0000000000000000 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: 000001003e120200 c000000f1d5b0cc0 0000000000000200 0000000000000000 GPR24: 0000000000000001 c000000000c269e0 0000000000000020 c000000f1d5b0c80 GPR28: c000000000ca3a08 c000000000ca3dec c000000f1c667e00 c000000f1d213850 [ 1137.734886] NIP [c0000000003efa2c] .tg_prfill_cpu_rwstat+0xac/0x180 [ 1137.734915] LR [c0000000003ef9f0] .tg_prfill_cpu_rwstat+0x70/0x180 [ 1137.734943] Call Trace: [ 1137.734952] [c000000f1d213780] [d000000005560520] 0xd000000005560520 (unreliable) [ 1137.734996] [c000000f1d2138a0] [c0000000003ed3a0] .blkcg_print_blkgs+0xe0/0x1a0 [ 1137.735039] [c000000f1d213960] [c0000000003efb50] .tg_print_cpu_rwstat+0x50/0x70 [ 1137.735082] [c000000f1d2139e0] [c000000000104b48] .cgroup_seqfile_show+0x58/0x150 [ 1137.735125] [c000000f1d213a70] [c0000000002749dc] .kernfs_seq_show+0x3c/0x50 [ 1137.735161] [c000000f1d213ae0] [c000000000218630] .seq_read+0xe0/0x510 [ 1137.735197] [c000000f1d213bd0] [c000000000275b04] .kernfs_fop_read+0x164/0x200 [ 1137.735240] [c000000f1d213c80] [c0000000001eb8e0] .__vfs_read+0x30/0x80 [ 1137.735276] [c000000f1d213cf0] [c0000000001eb9c4] .vfs_read+0x94/0x1b0 [ 1137.735312] [c000000f1d213d90] [c0000000001ebb38] .SyS_read+0x58/0x100 [ 1137.735349] [c000000f1d213e30] [c000000000009218] syscall_exit+0x0/0x98 [ 1137.735383] Instruction dump: [ 1137.735405] 7c6307b4 7f891800 409d00b8 60000000 60420000 3d420004 392a63b0 786a1f24 [ 1137.735471] 7d49502a e93e01c8 7d495214 7d2ad214 <7cead02a> e9090008 e9490010 e9290018 And here is one code that allows to easily reproduce this, although this has first been found by running docker. void run(pid_t pid) { int n; int status; int fd; char *buffer; buffer = memalign(BUFFER_ALIGN, BUFFER_SIZE); n = snprintf(buffer, BUFFER_SIZE, "%d\n", pid); fd = open(CGPATH "/test/tasks", O_WRONLY); write(fd, buffer, n); close(fd); if (fork() > 0) { fd = open("/dev/sda", O_RDONLY | O_DIRECT); read(fd, buffer, 512); close(fd); wait(&status); } else { fd = open(CGPATH "/test/blkio.throttle.io_serviced", O_RDONLY); n = read(fd, buffer, BUFFER_SIZE); close(fd); } free(buffer); exit(0); } void test(void) { int status; mkdir(CGPATH "/test", 0666); if (fork() > 0) wait(&status); else run(getpid()); rmdir(CGPATH "/test"); } int main(int argc, char **argv) { int i; for (i = 0; i < NR_TESTS; i++) test(); return 0; } Reported-by:
Ricardo Marin Matinata <rmm@br.ibm.com> Signed-off-by:
Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com> Signed-off-by:
Jens Axboe <axboe@fb.com> Signed-off-by:
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Filipe Manana authored
commit 1a4bcf47 upstream. We have a scenario where after the fsync log replay we can lose file data that had been previously fsync'ed if we added an hard link for our inode and after that we sync'ed the fsync log (for example by fsync'ing some other file or directory). This is because when adding an hard link we updated the inode item in the log tree with an i_size value of 0. At that point the new inode item was in memory only and a subsequent fsync log replay would not make us lose the file data. However if after adding the hard link we sync the log tree to disk, by fsync'ing some other file or directory for example, we ended up losing the file data after log replay, because the inode item in the persisted log tree had an an i_size of zero. This is easy to reproduce, and the following excerpt from my test for xfstests shows this: _scratch_mkfs >> $seqres.full 2>&1 _init_flakey _mount_flakey # Create one file with data and fsync it. # This made the btrfs fsync log persist the data and the inode metadata with # a correct inode->i_size (4096 bytes). $XFS_IO_PROG -f -c "pwrite -S 0xaa -b 4K 0 4K" -c "fsync" \ $SCRATCH_MNT/foo | _filter_xfs_io # Now add one hard link to our file. This made the btrfs code update the fsync # log, in memory only, with an inode metadata having a size of 0. ln $SCRATCH_MNT/foo $SCRATCH_MNT/foo_link # Now force persistence of the fsync log to disk, for example, by fsyncing some # other file. touch $SCRATCH_MNT/bar $XFS_IO_PROG -c "fsync" $SCRATCH_MNT/bar # Before a power loss or crash, we could read the 4Kb of data from our file as # expected. echo "File content before:" od -t x1 $SCRATCH_MNT/foo # Simulate a crash/power loss. _load_flakey_table $FLAKEY_DROP_WRITES _unmount_flakey _load_flakey_table $FLAKEY_ALLOW_WRITES _mount_flakey # After the fsync log replay, because the fsync log had a value of 0 for our # inode's i_size, we couldn't read anymore the 4Kb of data that we previously # wrote and fsync'ed. The size of the file became 0 after the fsync log replay. echo "File content after:" od -t x1 $SCRATCH_MNT/foo Another alternative test, that doesn't need to fsync an inode in the same transaction it was created, is: _scratch_mkfs >> $seqres.full 2>&1 _init_flakey _mount_flakey # Create our test file with some data. $XFS_IO_PROG -f -c "pwrite -S 0xaa -b 8K 0 8K" \ $SCRATCH_MNT/foo | _filter_xfs_io # Make sure the file is durably persisted. sync # Append some data to our file, to increase its size. $XFS_IO_PROG -f -c "pwrite -S 0xcc -b 4K 8K 4K" \ $SCRATCH_MNT/foo | _filter_xfs_io # Fsync the file, so from this point on if a crash/power failure happens, our # new data is guaranteed to be there next time the fs is mounted. $XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foo # Add one hard link to our file. This made btrfs write into the in memory fsync # log a special inode with generation 0 and an i_size of 0 too. Note that this # didn't update the inode in the fsync log on disk. ln $SCRATCH_MNT/foo $SCRATCH_MNT/foo_link # Now make sure the in memory fsync log is durably persisted. # Creating and fsync'ing another file will do it. touch $SCRATCH_MNT/bar $XFS_IO_PROG -c "fsync" $SCRATCH_MNT/bar # As expected, before the crash/power failure, we should be able to read the # 12Kb of file data. echo "File content before:" od -t x1 $SCRATCH_MNT/foo # Simulate a crash/power loss. _load_flakey_table $FLAKEY_DROP_WRITES _unmount_flakey _load_flakey_table $FLAKEY_ALLOW_WRITES _mount_flakey # After mounting the fs again, the fsync log was replayed. # The btrfs fsync log replay code didn't update the i_size of the persisted # inode because the inode item in the log had a special generation with a # value of 0 (and it couldn't know the correct i_size, since that inode item # had a 0 i_size too). This made the last 4Kb of file data inaccessible and # effectively lost. echo "File content after:" od -t x1 $SCRATCH_MNT/foo This isn't a new issue/regression. This problem has been around since the log tree code was added in 2008: Btrfs: Add a write ahead tree log to optimize synchronous operations (commit e02119d5) Test cases for xfstests follow soon. Signed-off-by:
Filipe Manana <fdmanana@suse.com> Signed-off-by:
Chris Mason <clm@fb.com> Signed-off-by:
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David Sterba authored
commit 381cf658 upstream. If btrfs_find_item is called with NULL path it allocates one locally but does not free it. Affected paths are inserting an orphan item for a file and for a subvol root. Move the path allocation to the callers. Fixes: 3f870c28 ("btrfs: expand btrfs_find_item() to include find_orphan_item functionality") Signed-off-by:
David Sterba <dsterba@suse.cz> Signed-off-by:
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David Sterba authored
commit 5efa0490 upstream. This has been confusing people for too long, the message is really just informative. Signed-off-by:
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Ilya Dryomov authored
commit 7eb71e03 upstream. It turns out it's possible to get __remove_osd() called twice on the same OSD. That doesn't sit well with rb_erase() - depending on the shape of the tree we can get a NULL dereference, a soft lockup or a random crash at some point in the future as we end up touching freed memory. One scenario that I was able to reproduce is as follows: <osd3 is idle, on the osd lru list> <con reset - osd3> con_fault_finish() osd_reset() <osdmap - osd3 down> ceph_osdc_handle_map() <takes map_sem> kick_requests() <takes request_mutex> reset_changed_osds() __reset_osd() __remove_osd() <releases request_mutex> <releases map_sem> <takes map_sem> <takes request_mutex> __kick_osd_requests() __reset_osd() __remove_osd() <-- !!! A case can be made that osd refcounting is imperfect and reworking it would be a proper resolution, but for now Sage and I decided to fix this by adding a safe guard around __remove_osd(). Fixes: http://tracker.ceph.com/issues/8087 Cc: Sage Weil <sage@redhat.com> Signed-off-by:
Ilya Dryomov <idryomov@gmail.com> Reviewed-by:
Sage Weil <sage@redhat.com> Reviewed-by:
Alex Elder <elder@linaro.org> Signed-off-by:
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Hans de Goede authored
commit 4690555e upstream. Since kernel 3.14 the backlight control has been broken on various Samsung Atom based netbooks. This has been bisected and this problem happens since commit b35684b8 ("drm/i915: do full backlight setup at enable time") This has been reported and discussed in detail here: http://lists.freedesktop.org/archives/intel-gfx/2014-July/049395.html Unfortunately no-one has been able to fix this. This only affects Samsung Atom netbooks, and the Linux kernel and the BIOS of those laptops have never worked well together. All affected laptops already have a quirk to avoid using the standard acpi-video interface and instead use the samsung specific SABI interface which samsung-laptop uses. It seems that recent fixes to the i915 driver have also broken backlight control through the SABI interface. The intel_backlight driver OTOH works fine, and also allows for finer grained backlight control. So add a new use_native_backlight quirk, and replace the broken_acpi_video quirk with this quirk for affected models. This new quirk disables acpi-video as before and also stops samsung-laptop from registering the SABI based samsung_laptop backlight interface, leaving only the working intel_backlight interface. This commit enables this new quirk for 3 models which are known to be affected, chances are that it needs to be used on other models too. BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1094948 # N145P BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1115713 # N250P Reported-by: Bertrik Sikken <bertrik@sikken.nl> # N150P Cc: stable@vger.kernel.org # 3.16 Signed-off-by:
Hans de Goede <hdegoede@redhat.com> Signed-off-by:
Darren Hart <dvhart@linux.intel.com> Signed-off-by:
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Chen Jie authored
commit 164c2406 upstream. sm->offset maybe wrong but magic maybe right, the offset do not have CRC. Badness at c00c7580 [verbose debug info unavailable] NIP: c00c7580 LR: c00c718c CTR: 00000014 REGS: df07bb40 TRAP: 0700 Not tainted (2.6.34.13-WR4.3.0.0_standard) MSR: 00029000 <EE,ME,CE> CR: 22084f84 XER: 00000000 TASK = df84d6e0[908] 'mount' THREAD: df07a000 GPR00: 00000001 df07bbf0 df84d6e0 00000000 00000001 00000000 df07bb58 00000041 GPR08: 00000041 c0638860 00000000 00000010 22084f88 100636c8 df814ff8 00000000 GPR16: df84d6e0 dfa558cc c05adb90 00000048 c0452d30 00000000 000240d0 000040d0 GPR24: 00000014 c05ae734 c05be2e0 00000000 00000001 00000000 00000000 c05ae730 NIP [c00c7580] __alloc_pages_nodemask+0x4d0/0x638 LR [c00c718c] __alloc_pages_nodemask+0xdc/0x638 Call Trace: [df07bbf0] [c00c718c] __alloc_pages_nodemask+0xdc/0x638 (unreliable) [df07bc90] [c00c7708] __get_free_pages+0x20/0x48 [df07bca0] [c00f4a40] __kmalloc+0x15c/0x1ec [df07bcd0] [c01fc880] jffs2_scan_medium+0xa58/0x14d0 [df07bd70] [c01ff38c] jffs2_do_mount_fs+0x1f4/0x6b4 [df07bdb0] [c020144c] jffs2_do_fill_super+0xa8/0x260 [df07bdd0] [c020230c] jffs2_fill_super+0x104/0x184 [df07be00] [c0335814] get_sb_mtd_aux+0x9c/0xec [df07be20] [c033596c] get_sb_mtd+0x84/0x1e8 [df07be60] [c0201ed0] jffs2_get_sb+0x1c/0x2c [df07be70] [c0103898] vfs_kern_mount+0x78/0x1e8 [df07bea0] [c0103a58] do_kern_mount+0x40/0x100 [df07bec0] [c011fe90] do_mount+0x240/0x890 [df07bf10] [c0120570] sys_mount+0x90/0xd8 [df07bf40] [c00110d8] ret_from_syscall+0x0/0x4 === Exception: c01 at 0xff61a34 LR = 0x100135f0 Instruction dump: 38800005 38600000 48010f41 4bfffe1c 4bfc2d15 4bfffe8c 72e90200 4082fc28 3d20c064 39298860 8809000d 68000001 <0f000000> 2f800000 419efc0c 38000001 mount: mounting /dev/mtdblock3 on /common failed: Input/output error Signed-off-by:
Chen Jie <chenjie6@huawei.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
David Woodhouse <David.Woodhouse@intel.com> Signed-off-by:
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Daniel J Blueman authored
commit 0c510cc8 upstream. When DRAM errors occur on memory controllers after EDAC_MAX_MCS (16), the kernel fatally dereferences unallocated structures, see splat below; this occurs on at least NumaConnect systems. Fix by checking if a memory controller info structure was found. BUG: unable to handle kernel NULL pointer dereference at 0000000000000320 IP: [<ffffffff819f714f>] decode_bus_error+0x2f/0x2b0 PGD 2f8b5a3067 PUD 2f8b5a2067 PMD 0 Oops: 0000 [#2] SMP Modules linked in: CPU: 224 PID: 11930 Comm: stream_c.exe.gn Tainted: G D 3.19.0 #1 Hardware name: Supermicro H8QGL/H8QGL, BIOS 3.5b 01/28/2015 task: ffff8807dbfb8c00 ti: ffff8807dd16c000 task.ti: ffff8807dd16c000 RIP: 0010:[<ffffffff819f714f>] [<ffffffff819f714f>] decode_bus_error+0x2f/0x2b0 RSP: 0000:ffff8907dfc03c48 EFLAGS: 00010297 RAX: 0000000000000001 RBX: 9c67400010080a13 RCX: 0000000000001dc6 RDX: 000000001dc61dc6 RSI: ffff8907dfc03df0 RDI: 000000000000001c RBP: ffff8907dfc03ce8 R08: 0000000000000000 R09: 0000000000000022 R10: ffff891fffa30380 R11: 00000000001cfc90 R12: 0000000000000008 R13: 0000000000000000 R14: 000000000000001c R15: 00009c6740001000 FS: 00007fa97ee18700(0000) GS:ffff8907dfc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000320 CR3: 0000003f889b8000 CR4: 00000000000407e0 Stack: 0000000000000000 ffff8907dfc03df0 0000000000000008 9c67400010080a13 000000000000001c 00009c6740001000 ffff8907dfc03c88 ffffffff810e4f9a ffff8907dfc03ce8 ffffffff81b375b9 0000000000000000 0000000000000010 Call Trace: <IRQ> ? vprintk_default ? printk amd_decode_mce notifier_call_chain atomic_notifier_call_chain mce_log machine_check_poll mce_timer_fn ? mce_cpu_restart call_timer_fn.isra.29 run_timer_softirq __do_softirq irq_exit smp_apic_timer_interrupt apic_timer_interrupt <EOI> ? down_read_trylock __do_page_fault ? __schedule do_page_fault page_fault Signed-off-by:
Daniel J Blueman <daniel@numascale.com> Link: http://lkml.kernel.org/r/1424144078-24589-1-git-send-email-daniel@numascale.com [ Boris: massage commit message ] Signed-off-by:
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Borislav Petkov authored
commit 11249e73 upstream. d0585cd8 ("sb_edac: Claim a different PCI device") changed the probing of sb_edac to look for PCI device 0x3ca0: 3f:0e.0 System peripheral: Intel Corporation Xeon E5/Core i7 Processor Home Agent (rev 07) 00: 86 80 a0 3c 00 00 00 00 07 00 80 08 00 00 80 00 ... but we're matching for 0x3ca8, i.e. PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TA in sbridge_probe() therefore the probing fails. Changing it to probe for 0x3ca0 (PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_HA0), .i.e., the 14.0 device, fixes the issue and driver loads successfully again: [ 2449.013120] EDAC DEBUG: sbridge_init: [ 2449.017029] EDAC sbridge: Seeking for: PCI ID 8086:3ca0 [ 2449.022368] EDAC DEBUG: sbridge_get_onedevice: Detected 8086:3ca0 [ 2449.028498] EDAC sbridge: Seeking for: PCI ID 8086:3ca0 [ 2449.033768] EDAC sbridge: Seeking for: PCI ID 8086:3ca8 [ 2449.039028] EDAC DEBUG: sbridge_get_onedevice: Detected 8086:3ca8 [ 2449.045155] EDAC sbridge: Seeking for: PCI ID 8086:3ca8 ... Add a debug printk while at it to be able to catch the failure in the future and dump driver version on successful load. Fixes: d0585cd8 ("sb_edac: Claim a different PCI device") Acked-by:
Aristeu Rozanski <aris@redhat.com> Cc: Tony Luck <tony.luck@intel.com> Acked-by:
Mauro Carvalho Chehab <m.chehab@samsung.com> Signed-off-by:
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Tomáš Hodek authored
commit d1901ef0 upstream. When a drive is marked write-mostly it should only be the target of reads if there is no other option. This behaviour was broken by commit 9dedf603 md/raid1: read balance chooses idlest disk for SSD which causes a write-mostly device to be *preferred* is some cases. Restore correct behaviour by checking and setting best_dist_disk and best_pending_disk rather than best_disk. We only need to test one of these as they are both changed from -1 or >=0 at the same time. As we leave min_pending and best_dist unchanged, any non-write-mostly device will appear better than the write-mostly device. Reported-by:
Tomáš Hodek <tomas.hodek@volny.cz> Reported-by:
Dark Penguin <darkpenguin@yandex.ru> Signed-off-by:
NeilBrown <neilb@suse.de> Link: http://marc.info/?l=linux-raid&m=135982797322422 Fixes: 9dedf603Signed-off-by:
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NeilBrown authored
commit 26ac1073 upstream. Commit a7854487: md: When RAID5 is dirty, force reconstruct-write instead of read-modify-write. Causes an RCW cycle to be forced even when the array is degraded. A degraded array cannot support RCW as that requires reading all data blocks, and one may be missing. Forcing an RCW when it is not possible causes a live-lock and the code spins, repeatedly deciding to do something that cannot succeed. So change the condition to only force RCW on non-degraded arrays. Reported-by:
Manibalan P <pmanibalan@amiindia.co.in> Bisected-by:
Jes Sorensen <Jes.Sorensen@redhat.com> Tested-by:
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Adrian Hunter authored
commit 48536c91 upstream. Commit f6edb53c converted the probe to a CPU wide event first (pid == -1). For kernels that do not support the PERF_FLAG_FD_CLOEXEC flag the probe fails with EINVAL. Since this errno is not handled pid is not reset to 0 and the subsequent use of pid = -1 as an argument brings in an additional failure path if perf_event_paranoid > 0: $ perf record -- sleep 1 perf_event_open(..., 0) failed unexpectedly with error 13 (Permission denied) [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.007 MB /tmp/perf.data (11 samples) ] Also, ensure the fd of the confirmation check is closed and comment why pid = -1 is used. Needs to go to 3.18 stable tree as well. Signed-off-by:
Adrian Hunter <adrian.hunter@intel.com> Based-on-patch-by:
David Ahern <david.ahern@oracle.com> Acked-by:
Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by:
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Matthias Brugger authored
commit d4a19eb3 upstream. We have two race conditions in the probe code which could lead to a null pointer dereference in the interrupt handler. The interrupt handler accesses the clockevent device, which may not yet be registered. First race condition happens when the interrupt handler gets registered before the interrupts get disabled. The second race condition happens when the interrupts get enabled, but the clockevent device is not yet registered. Fix that by disabling the interrupts before we register the interrupt and enable the interrupts after the clockevent device got registered. Reported-by:
Gongbae Park <yongbae2@gmail.com> Signed-off-by:
Matthias Brugger <matthias.bgg@gmail.com> Signed-off-by:
Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by:
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James Hogan authored
commit c2996cb2 upstream. The KSTK_EIP() and KSTK_ESP() macros should return the user program counter (PC) and stack pointer (A0StP) of the given task. These are used to determine which VMA corresponds to the user stack in /proc/<pid>/maps, and for the user PC & A0StP in /proc/<pid>/stat. However for Meta the PC & A0StP from the task's kernel context are used, resulting in broken output. For example in following /proc/<pid>/maps output, the 3afff000-3b021000 VMA should be described as the stack: # cat /proc/self/maps ... 100b0000-100b1000 rwxp 00000000 00:00 0 [heap] 3afff000-3b021000 rwxp 00000000 00:00 0 And in the following /proc/<pid>/stat output, the PC is in kernel code (1074234964 = 0x40078654) and the A0StP is in the kernel heap (1335981392 = 0x4fa17550): # cat /proc/self/stat 51 (cat) R ... 1335981392 1074234964 ... Fix the definitions of KSTK_EIP() and KSTK_ESP() to use task_pt_regs(tsk)->ctx rather than (tsk)->thread.kernel_context. This gets the registers from the user context stored after the thread info at the base of the kernel stack, which is from the last entry into the kernel from userland, regardless of where in the kernel the task may have been interrupted, which results in the following more correct /proc/<pid>/maps output: # cat /proc/self/maps ... 0800b000-08070000 r-xp 00000000 00:02 207 /lib/libuClibc-0.9.34-git.so ... 100b0000-100b1000 rwxp 00000000 00:00 0 [heap] 3afff000-3b021000 rwxp 00000000 00:00 0 [stack] And /proc/<pid>/stat now correctly reports the PC in libuClibc (134320308 = 0x80190b4) and the A0StP in the [stack] region (989864576 = 0x3b002280): # cat /proc/self/stat 51 (cat) R ... 989864576 134320308 ... Reported-by:
Alexey Brodkin <Alexey.Brodkin@synopsys.com> Reported-by:
Vineet Gupta <Vineet.Gupta1@synopsys.com> Signed-off-by:
James Hogan <james.hogan@imgtec.com> Cc: linux-metag@vger.kernel.org Signed-off-by:
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