Pull perf fixes from Ingo Molnar: "Six fixes for bugs that were found via fuzzing, and a trivial hw-enablement patch for AMD Family-17h CPU PMUs" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86/intel/uncore: Allow only a single PMU/box within an events group perf/x86/intel: Cure bogus unwind from PEBS entries perf/x86: Restore TASK_SIZE check on frame pointer perf/core: Fix address filter parser perf/x86: Add perf support for AMD family-17h processors perf/x86/uncore: Fix crash by removing bogus event_list[] handling for SNB client uncore IMC perf/core: Do not set cpuctx->cgrp for unscheduled cgroups
Exactly because for_each_thread() in autogroup_move_group() can't see it and update its ->sched_task_group before _put() and possibly free(). So the exiting task needs another sched_move_task() before exit_notify() and we need to re-introduce the PF_EXITING (or similar) check removed by the previous change for another reason. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: hartsjc@redhat.com Cc: vbendel@redhat.com Cc: vlovejoy@redhat.com Link: http://lkml.kernel.org/r/20161114184612.GA15968@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
The PF_EXITING check in task_wants_autogroup() is no longer needed. Remove
it, but see the next patch.
However the comment is correct in that autogroup_move_group() must always
change task_group() for every thread so the sysctl_ check is very wrong;
we can race with cgroups and even sys_setsid() is not safe because a task
running with task_group() == ag->tg must participate in refcounting:
int main(void)
{
int sctl = open("/proc/sys/kernel/sched_autogroup_enabled", O_WRONLY);
assert(sctl > 0);
if (fork()) {
wait(NULL); // destroy the child's ag/tg
pause();
}
assert(pwrite(sctl, "1\n", 2, 0) == 2);
assert(setsid() > 0);
if (fork())
pause();
kill(getppid(), SIGKILL);
sleep(1);
// The child has gone, the grandchild runs with kref == 1
assert(pwrite(sctl, "0\n", 2, 0) == 2);
assert(setsid() > 0);
// runs with the freed ag/tg
for (;;)
sleep(1);
return 0;
}
crashes the kernel. It doesn't really need sleep(1), it doesn't matter if
autogroup_move_group() actually frees the task_group or this happens later.
Reported-by: Vern Lovejoy <vlovejoy@redhat.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: hartsjc@redhat.com
Cc: vbendel@redhat.com
Link: http://lkml.kernel.org/r/20161114184609.GA15965@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Pull sparc fixes from David Miller:
1) With modern networking cards we can run out of 32-bit DMA space, so
support 64-bit DMA addressing when possible on sparc64. From Dave
Tushar.
2) Some signal frame validation checks are inverted on sparc32, fix
from Andreas Larsson.
3) Lockdep tables can get too large in some circumstances on sparc64,
add a way to adjust the size a bit. From Babu Moger.
4) Fix NUMA node probing on some sun4v systems, from Thomas Tai.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
sparc: drop duplicate header scatterlist.h
lockdep: Limit static allocations if PROVE_LOCKING_SMALL is defined
config: Adding the new config parameter CONFIG_PROVE_LOCKING_SMALL for sparc
sunbmac: Fix compiler warning
sunqe: Fix compiler warnings
sparc64: Enable 64-bit DMA
sparc64: Enable sun4v dma ops to use IOMMU v2 APIs
sparc64: Bind PCIe devices to use IOMMU v2 service
sparc64: Initialize iommu_map_table and iommu_pool
sparc64: Add ATU (new IOMMU) support
sparc64: Add FORCE_MAX_ZONEORDER and default to 13
sparc64: fix compile warning section mismatch in find_node()
sparc32: Fix inverted invalid_frame_pointer checks on sigreturns
sparc64: Fix find_node warning if numa node cannot be found
Pull networking fixes from David Miller:
1) Clear congestion control state when changing algorithms on an
existing socket, from Florian Westphal.
2) Fix register bit values in altr_tse_pcs portion of stmmac driver,
from Jia Jie Ho.
3) Fix PTP handling in stammc driver for GMAC4, from Giuseppe
CAVALLARO.
4) Fix udplite multicast delivery handling, it ignores the udp_table
parameter passed into the lookups, from Pablo Neira Ayuso.
5) Synchronize the space estimated by rtnl_vfinfo_size and the space
actually used by rtnl_fill_vfinfo. From Sabrina Dubroca.
6) Fix memory leak in fib_info when splitting nodes, from Alexander
Duyck.
7) If a driver does a napi_hash_del() explicitily and not via
netif_napi_del(), it must perform RCU synchronization as needed. Fix
this in virtio-net and bnxt drivers, from Eric Dumazet.
8) Likewise, it is not necessary to invoke napi_hash_del() is we are
also doing neif_napi_del() in the same code path. Remove such calls
from be2net and cxgb4 drivers, also from Eric Dumazet.
9) Don't allocate an ID in peernet2id_alloc() if the netns is dead,
from WANG Cong.
10) Fix OF node and device struct leaks in of_mdio, from Johan Hovold.
11) We cannot cache routes in ip6_tunnel when using inherited traffic
classes, from Paolo Abeni.
12) Fix several crashes and leaks in cpsw driver, from Johan Hovold.
13) Splice operations cannot use freezable blocking calls in AF_UNIX,
from WANG Cong.
14) Link dump filtering by master device and kind support added an error
in loop index updates during the dump if we actually do filter, fix
from Zhang Shengju.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (59 commits)
tcp: zero ca_priv area when switching cc algorithms
net: l2tp: Treat NET_XMIT_CN as success in l2tp_eth_dev_xmit
ethernet: stmmac: make DWMAC_STM32 depend on it's associated SoC
tipc: eliminate obsolete socket locking policy description
rtnl: fix the loop index update error in rtnl_dump_ifinfo()
l2tp: fix racy SOCK_ZAPPED flag check in l2tp_ip{,6}_bind()
net: macb: add check for dma mapping error in start_xmit()
rtnetlink: fix FDB size computation
netns: fix get_net_ns_by_fd(int pid) typo
af_unix: conditionally use freezable blocking calls in read
net: ethernet: ti: cpsw: fix fixed-link phy probe deferral
net: ethernet: ti: cpsw: add missing sanity check
net: ethernet: ti: cpsw: fix secondary-emac probe error path
net: ethernet: ti: cpsw: fix of_node and phydev leaks
net: ethernet: ti: cpsw: fix deferred probe
net: ethernet: ti: cpsw: fix mdio device reference leak
net: ethernet: ti: cpsw: fix bad register access in probe error path
net: sky2: Fix shutdown crash
cfg80211: limit scan results cache size
net sched filters: pass netlink message flags in event notification
...
The token table passed into match_token() must be null-terminated, which
it currently is not in the perf's address filter string parser, as caught
by Vince's perf_fuzzer and KASAN.
It doesn't blow up otherwise because of the alignment padding of the table
to the next element in the .rodata, which is luck.
Fixing by adding a null-terminator to the token table.
Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Tested-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dvyukov@google.com
Cc: stable@vger.kernel.org # v4.7+
Fixes: 375637bc524 ("perf/core: Introduce address range filtering")
Link: http://lkml.kernel.org/r/877f81f264.fsf@ashishki-desk.ger.corp.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reduce the size of data structure for lockdep entries by half if PROVE_LOCKING_SMALL if defined. This is used only for sparc. Signed-off-by: Babu Moger <babu.moger@oracle.com> Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
I made some invalid assumptions with BPF_AND and BPF_MOD that could result in invalid accesses to bpf map entries. Fix this up by doing a few things 1) Kill BPF_MOD support. This doesn't actually get used by the compiler in real life and just adds extra complexity. 2) Fix the logic for BPF_AND, don't allow AND of negative numbers and set the minimum value to 0 for positive AND's. 3) Don't do operations on the ranges if they are set to the limits, as they are by definition undefined, and allowing arithmetic operations on those values could make them appear valid when they really aren't. This fixes the testcase provided by Jann as well as a few other theoretical problems. Reported-by: Jann Horn <jannh@google.com> Signed-off-by: Josef Bacik <jbacik@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Pull tracing fixes from Steven Rostedt: "Alexei discovered a race condition in modules failing to load that can cause a ftrace check to trigger and disable ftrace. This is because of the way modules are registered to ftrace. Their functions are loaded in the ftrace function tables but set to "disabled" since they are still in the process of being loaded by the module. After the module is finished, it calls back into the ftrace infrastructure to enable it. Looking deeper into the locations that access all the functions in the table, I found more locations that should ignore the disabled ones" * tag 'trace-v4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: ftrace: Add more checks for FTRACE_FL_DISABLED in processing ip records ftrace: Ignore FTRACE_FL_DISABLED while walking dyn_ftrace records
Commit:
db4a835601b7 ("perf/core: Set cgroup in CPU contexts for new cgroup events")
failed to verify that event->cgrp is actually the scheduled cgroup
in a CPU before setting cpuctx->cgrp. This patch fixes that.
Now that there is a different path for scheduled and unscheduled
cgroup, add a warning to catch when cpuctx->cgrp is still set after
the last cgroup event has been unsheduled.
To verify the bug:
# Create 2 cgroups.
mkdir /dev/cgroups/devices/g1
mkdir /dev/cgroups/devices/g2
# launch a task, bind it to a cpu and move it to g1
CPU=2
while :; do : ; done &
P=$!
taskset -pc $CPU $P
echo $P > /dev/cgroups/devices/g1/tasks
# monitor g2 (it runs no tasks) and observe output
perf stat -e cycles -I 1000 -C $CPU -G g2
# time counts unit events
1.000091408 7,579,527 cycles g2
2.000350111 <not counted> cycles g2
3.000589181 <not counted> cycles g2
4.000771428 <not counted> cycles g2
# note first line that displays that a task run in g2, despite
# g2 having no tasks. This is because cpuctx->cgrp was wrongly
# set when context of new event was installed.
# After applying the fix we obtain the right output:
perf stat -e cycles -I 1000 -C $CPU -G g2
# time counts unit events
1.000119615 <not counted> cycles g2
2.000389430 <not counted> cycles g2
3.000590962 <not counted> cycles g2
Signed-off-by: David Carrillo-Cisneros <davidcc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vegard Nossum <vegard.nossum@gmail.com>
Link: http://lkml.kernel.org/r/1478026378-86083-1-git-send-email-davidcc@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>