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Pull XArray fixes from Matthew Wilcox:
"These all fix various bugs, some of which people have tripped over and
some of which have been caught by automatic tools"
* tag 'xarray-5.4' of git://git.infradead.org/users/willy/linux-dax:
idr: Fix idr_alloc_u32 on 32-bit systems
idr: Fix integer overflow in idr_for_each_entry
radix tree: Remove radix_tree_iter_find
idr: Fix idr_get_next_ul race with idr_remove
XArray: Fix xas_next() with a single entry at 0
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Pull drm fixes from Dave Airlie:
"Weekly fixes for drm: amdgpu has a few but they are pretty scattered
fixes, the fbdev one is a build regression fix that we didn't want to
risk leaving out, otherwise a couple of i915, one radeon and a core
atomic fix.
core:
- add missing documentation for GEM shmem madvise helpers
- Fix for a state dereference in atomic self-refresh helpers
fbdev:
- One compilation fix for c2p fbdev helpers
amdgpu:
- Fix navi14 display issue root cause and revert workaround
- GPU reset scheduler interaction fix
- Fix fan boost on multi-GPU
- Gfx10 and sdma5 fixes for navi
- GFXOFF fix for renoir
- Add navi14 PCI ID
- GPUVM fix for arcturus
radeon:
- Port an SI power fix from amdgpu
i915:
- Fix HPD poll to avoid kworker consuming a lot of cpu cycles.
- Do not use TBT type for non Type-C ports"
* tag 'drm-fixes-2019-11-08' of git://anongit.freedesktop.org/drm/drm:
drm/radeon: fix si_enable_smc_cac() failed issue
drm/amdgpu/renoir: move gfxoff handling into gfx9 module
drm/amdgpu: add warning for GRBM 1-cycle delay issue in gfx9
drm/amdgpu: add dummy read by engines for some GCVM status registers in gfx10
drm/amdgpu: register gpu instance before fan boost feature enablment
drm/amd/swSMU: fix smu workload bit map error
drm/shmem: Add docbook comments for drm_gem_shmem_object madvise fields
drm/amdgpu: add navi14 PCI ID
Revert "drm/amd/display: setting the DIG_MODE to the correct value."
drm/amd/display: Add ENGINE_ID_DIGD condition check for Navi14
drm/amdgpu: dont schedule jobs while in reset
drm/amdgpu/arcturus: properly set BANK_SELECT and FRAGMENT_SIZE
drm/atomic: fix self-refresh helpers crtc state dereference
drm/i915/dp: Do not switch aux to TBT mode for non-TC ports
drm/i915: Avoid HPD poll detect triggering a new detect cycle
fbdev: c2p: Fix link failure on non-inlining
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git://anongit.freedesktop.org/drm/drm-misc into drm-fixes
- Some new documentation for GEM shmem madvise helpers
- Fix for a state dereference in atomic self-refresh helpers
- One compilation fix for c2p fbdev helpers
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191107082215.GA34850@gilmour.lan
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Add missing docbook comments to madvise fields in struct
drm_gem_shmem_object which fixes these warnings:
include/drm/drm_gem_shmem_helper.h:87: warning: Function parameter or member 'madv' not described in 'drm_gem_shmem_object'
include/drm/drm_gem_shmem_helper.h:87: warning: Function parameter or member 'madv_list' not described in 'drm_gem_shmem_object'
Fixes: 17acb9f35ed7 ("drm/shmem: Add madvise state and purge helpers")
Reported-by: Sean Paul <sean@poorly.run>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Sean Paul <sean@poorly.run>
Link: https://patchwork.freedesktop.org/patch/msgid/20191101153754.22803-1-robh@kernel.org
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Merge more fixes from Andrew Morton:
"17 fixes"
Mostly mm fixes and one ocfs2 locking fix.
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
mm: memcontrol: fix network errors from failing __GFP_ATOMIC charges
mm/memory_hotplug: fix updating the node span
scripts/gdb: fix debugging modules compiled with hot/cold partitioning
mm: slab: make page_cgroup_ino() to recognize non-compound slab pages properly
MAINTAINERS: update information for "MEMORY MANAGEMENT"
dump_stack: avoid the livelock of the dump_lock
zswap: add Vitaly to the maintainers list
mm/page_alloc.c: ratelimit allocation failure warnings more aggressively
mm/khugepaged: fix might_sleep() warn with CONFIG_HIGHPTE=y
mm, vmstat: reduce zone->lock holding time by /proc/pagetypeinfo
mm, vmstat: hide /proc/pagetypeinfo from normal users
mm/mmu_notifiers: use the right return code for WARN_ON
ocfs2: protect extent tree in ocfs2_prepare_inode_for_write()
mm: thp: handle page cache THP correctly in PageTransCompoundMap
mm, meminit: recalculate pcpu batch and high limits after init completes
mm/gup_benchmark: fix MAP_HUGETLB case
mm: memcontrol: fix NULL-ptr deref in percpu stats flush
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drm_self_refresh_helper_update_avg_times() was incorrectly accessing the
new incoming state after drm_atomic_helper_commit_hw_done(). But this
state might have already been superceeded by an !nonblock atomic update
resulting in dereferencing an already free'd crtc_state.
TODO I *think* this will more or less do the right thing.. althought I'm
not 100% sure if, for example, we enter psr in a nonblock commit, and
then leave psr in a !nonblock commit that overtakes the completion of
the nonblock commit. Not sure if this sort of scenario can happen in
practice. But not crashing is better than crashing, so I guess we
should either take this patch or rever the self-refresh helpers until
Sean can figure out a better solution.
Fixes: d4da4e33341c ("drm: Measure Self Refresh Entry/Exit times to avoid thrashing")
Cc: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
[seanpaul fixed up some checkpatch warns]
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191104173737.142558-1-robdclark@gmail.com
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We have a usecase to use tmpfs as QEMU memory backend and we would like
to take the advantage of THP as well. But, our test shows the EPT is
not PMD mapped even though the underlying THP are PMD mapped on host.
The number showed by /sys/kernel/debug/kvm/largepage is much less than
the number of PMD mapped shmem pages as the below:
7f2778200000-7f2878200000 rw-s 00000000 00:14 262232 /dev/shm/qemu_back_mem.mem.Hz2hSf (deleted)
Size: 4194304 kB
[snip]
AnonHugePages: 0 kB
ShmemPmdMapped: 579584 kB
[snip]
Locked: 0 kB
cat /sys/kernel/debug/kvm/largepages
12
And some benchmarks do worse than with anonymous THPs.
By digging into the code we figured out that commit 127393fbe597 ("mm:
thp: kvm: fix memory corruption in KVM with THP enabled") checks if
there is a single PTE mapping on the page for anonymous THP when setting
up EPT map. But the _mapcount < 0 check doesn't work for page cache THP
since every subpage of page cache THP would get _mapcount inc'ed once it
is PMD mapped, so PageTransCompoundMap() always returns false for page
cache THP. This would prevent KVM from setting up PMD mapped EPT entry.
So we need handle page cache THP correctly. However, when page cache
THP's PMD gets split, kernel just remove the map instead of setting up
PTE map like what anonymous THP does. Before KVM calls get_user_pages()
the subpages may get PTE mapped even though it is still a THP since the
page cache THP may be mapped by other processes at the mean time.
Checking its _mapcount and whether the THP has PTE mapped or not.
Although this may report some false negative cases (PTE mapped by other
processes), it looks not trivial to make this accurate.
With this fix /sys/kernel/debug/kvm/largepage would show reasonable
pages are PMD mapped by EPT as the below:
7fbeaee00000-7fbfaee00000 rw-s 00000000 00:14 275464 /dev/shm/qemu_back_mem.mem.SKUvat (deleted)
Size: 4194304 kB
[snip]
AnonHugePages: 0 kB
ShmemPmdMapped: 557056 kB
[snip]
Locked: 0 kB
cat /sys/kernel/debug/kvm/largepages
271
And the benchmarks are as same as anonymous THPs.
[yang.shi@linux.alibaba.com: v4]
Link: http://lkml.kernel.org/r/1571865575-42913-1-git-send-email-yang.shi@linux.alibaba.com
Link: http://lkml.kernel.org/r/1571769577-89735-1-git-send-email-yang.shi@linux.alibaba.com
Fixes: dd78fedde4b9 ("rmap: support file thp")
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
Reported-by: Gang Deng <gavin.dg@linux.alibaba.com>
Tested-by: Gang Deng <gavin.dg@linux.alibaba.com>
Suggested-by: Hugh Dickins <hughd@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: <stable@vger.kernel.org> [4.8+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux
Pull clone3 stack argument update from Christian Brauner:
"This changes clone3() to do basic stack validation and to set up the
stack depending on whether or not it is growing up or down.
With clone3() the expectation is now very simply that the .stack
argument points to the lowest address of the stack and that
.stack_size specifies the initial stack size. This is diferent from
legacy clone() where the "stack" argument had to point to the lowest
or highest address of the stack depending on the architecture.
clone3() was released with 5.3. Currently, it is not documented and
very unclear to userspace how the stack and stack_size argument have
to be passed. After talking to glibc folks we concluded that changing
clone3() to determine stack direction and doing basic validation is
the right course of action.
Note, this is a potentially user visible change. In the very unlikely
case, that it breaks someone's use-case we will revert. (And then e.g.
place the new behavior under an appropriate flag.)
Note that passing an empty stack will continue working just as before.
Breaking someone's use-case is very unlikely. Neither glibc nor musl
currently expose a wrapper for clone3(). There is currently also no
real motivation for anyone to use clone3() directly. First, because
using clone{3}() with stacks requires some assembly (see glibc and
musl). Second, because it does not provide features that legacy
clone() doesn't. New features for clone3() will first happen in v5.5
which is why v5.4 is still a good time to try and make that change now
and backport it to v5.3.
I did a codesearch on https://codesearch.debian.net, github, and
gitlab and could not find any software currently relying directly on
clone3(). I expect this to change once we land CLONE_CLEAR_SIGHAND
which was a request coming from glibc at which point they'll likely
start using it"
* tag 'for-linus-2019-11-05' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux:
clone3: validate stack arguments
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Validate the stack arguments and setup the stack depening on whether or not
it is growing down or up.
Legacy clone() required userspace to know in which direction the stack is
growing and pass down the stack pointer appropriately. To make things more
confusing microblaze uses a variant of the clone() syscall selected by
CONFIG_CLONE_BACKWARDS3 that takes an additional stack_size argument.
IA64 has a separate clone2() syscall which also takes an additional
stack_size argument. Finally, parisc has a stack that is growing upwards.
Userspace therefore has a lot nasty code like the following:
#define __STACK_SIZE (8 * 1024 * 1024)
pid_t sys_clone(int (*fn)(void *), void *arg, int flags, int *pidfd)
{
pid_t ret;
void *stack;
stack = malloc(__STACK_SIZE);
if (!stack)
return -ENOMEM;
#ifdef __ia64__
ret = __clone2(fn, stack, __STACK_SIZE, flags | SIGCHLD, arg, pidfd);
#elif defined(__parisc__) /* stack grows up */
ret = clone(fn, stack, flags | SIGCHLD, arg, pidfd);
#else
ret = clone(fn, stack + __STACK_SIZE, flags | SIGCHLD, arg, pidfd);
#endif
return ret;
}
or even crazier variants such as [3].
With clone3() we have the ability to validate the stack. We can check that
when stack_size is passed, the stack pointer is valid and the other way
around. We can also check that the memory area userspace gave us is fine to
use via access_ok(). Furthermore, we probably should not require
userspace to know in which direction the stack is growing. It is easy
for us to do this in the kernel and I couldn't find the original
reasoning behind exposing this detail to userspace.
/* Intentional user visible API change */
clone3() was released with 5.3. Currently, it is not documented and very
unclear to userspace how the stack and stack_size argument have to be
passed. After talking to glibc folks we concluded that trying to change
clone3() to setup the stack instead of requiring userspace to do this is
the right course of action.
Note, that this is an explicit change in user visible behavior we introduce
with this patch. If it breaks someone's use-case we will revert! (And then
e.g. place the new behavior under an appropriate flag.)
Breaking someone's use-case is very unlikely though. First, neither glibc
nor musl currently expose a wrapper for clone3(). Second, there is no real
motivation for anyone to use clone3() directly since it does not provide
features that legacy clone doesn't. New features for clone3() will first
happen in v5.5 which is why v5.4 is still a good time to try and make that
change now and backport it to v5.3. Searches on [4] did not reveal any
packages calling clone3().
[1]: https://lore.kernel.org/r/CAG48ez3q=BeNcuVTKBN79kJui4vC6nw0Bfq6xc-i0neheT17TA@mail.gmail.com
[2]: https://lore.kernel.org/r/20191028172143.4vnnjpdljfnexaq5@wittgenstein
[3]: https://github.com/systemd/systemd/blob/5238e9575906297608ff802a27e2ff9effa3b338/src/basic/raw-clone.h#L31
[4]: https://codesearch.debian.net
Fixes: 7f192e3cd316 ("fork: add clone3")
Cc: Kees Cook <keescook@chromium.org>
Cc: Jann Horn <jannh@google.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-api@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: <stable@vger.kernel.org> # 5.3
Cc: GNU C Library <libc-alpha@sourceware.org>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Aleksa Sarai <cyphar@cyphar.com>
Link: https://lore.kernel.org/r/20191031113608.20713-1-christian.brauner@ubuntu.com
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If there is an entry at INT_MAX then idr_for_each_entry() will increment
id after handling it. This is undefined behaviour, and is caught by
UBSAN. Adding 1U to id forces the operation to be carried out as an
unsigned addition which (when assigned to id) will result in INT_MIN.
Since there is never an entry stored at INT_MIN, idr_get_next() will
return NULL, ending the loop as expected.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
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This API is unsafe to use under the RCU lock. With no in-tree users
remaining, remove it to prevent future bugs.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
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Pull networking fixes from David Miller:
1) Fix free/alloc races in batmanadv, from Sven Eckelmann.
2) Several leaks and other fixes in kTLS support of mlx5 driver, from
Tariq Toukan.
3) BPF devmap_hash cost calculation can overflow on 32-bit, from Toke
Høiland-Jørgensen.
4) Add an r8152 device ID, from Kazutoshi Noguchi.
5) Missing include in ipv6's addrconf.c, from Ben Dooks.
6) Use siphash in flow dissector, from Eric Dumazet. Attackers can
easily infer the 32-bit secret otherwise etc.
7) Several netdevice nesting depth fixes from Taehee Yoo.
8) Fix several KCSAN reported errors, from Eric Dumazet. For example,
when doing lockless skb_queue_empty() checks, and accessing
sk_napi_id/sk_incoming_cpu lockless as well.
9) Fix jumbo packet handling in RXRPC, from David Howells.
10) Bump SOMAXCONN and tcp_max_syn_backlog values, from Eric Dumazet.
11) Fix DMA synchronization in gve driver, from Yangchun Fu.
12) Several bpf offload fixes, from Jakub Kicinski.
13) Fix sk_page_frag() recursion during memory reclaim, from Tejun Heo.
14) Fix ping latency during high traffic rates in hisilicon driver, from
Jiangfent Xiao.
* git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (146 commits)
net: fix installing orphaned programs
net: cls_bpf: fix NULL deref on offload filter removal
selftests: bpf: Skip write only files in debugfs
selftests: net: reuseport_dualstack: fix uninitalized parameter
r8169: fix wrong PHY ID issue with RTL8168dp
net: dsa: bcm_sf2: Fix IMP setup for port different than 8
net: phylink: Fix phylink_dbg() macro
gve: Fixes DMA synchronization.
inet: stop leaking jiffies on the wire
ixgbe: Remove duplicate clear_bit() call
Documentation: networking: device drivers: Remove stray asterisks
e1000: fix memory leaks
i40e: Fix receive buffer starvation for AF_XDP
igb: Fix constant media auto sense switching when no cable is connected
net: ethernet: arc: add the missed clk_disable_unprepare
igb: Enable media autosense for the i350.
igb/igc: Don't warn on fatal read failures when the device is removed
tcp: increase tcp_max_syn_backlog max value
net: increase SOMAXCONN to 4096
netdevsim: Fix use-after-free during device dismantle
...
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Pull NFS client bugfixes from Anna Schumaker:
"This contains two delegation fixes (with the RCU lock leak fix marked
for stable), and three patches to fix destroying the the sunrpc back
channel.
Stable bugfixes:
- Fix an RCU lock leak in nfs4_refresh_delegation_stateid()
Other fixes:
- The TCP back channel mustn't disappear while requests are
outstanding
- The RDMA back channel mustn't disappear while requests are
outstanding
- Destroy the back channel when we destroy the host transport
- Don't allow a cached open with a revoked delegation"
* tag 'nfs-for-5.4-3' of git://git.linux-nfs.org/projects/anna/linux-nfs:
NFS: Fix an RCU lock leak in nfs4_refresh_delegation_stateid()
NFSv4: Don't allow a cached open with a revoked delegation
SUNRPC: Destroy the back channel when we destroy the host transport
SUNRPC: The RDMA back channel mustn't disappear while requests are outstanding
SUNRPC: The TCP back channel mustn't disappear while requests are outstanding
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Ingo Molnar:
"Misc fixes: an ABI fix for a reserved field, AMD IBS fixes, an Intel
uncore PMU driver fix and a header typo fix"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/headers: Fix spelling s/EACCESS/EACCES/, s/privilidge/privilege/
perf/x86/uncore: Fix event group support
perf/x86/amd/ibs: Handle erratum #420 only on the affected CPU family (10h)
perf/x86/amd/ibs: Fix reading of the IBS OpData register and thus precise RIP validity
perf/core: Start rejecting the syscall with attr.__reserved_2 set
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull EFI fixes from Ingo Molnar:
"Various fixes all over the map: prevent boot crashes on HyperV,
classify UEFI randomness as bootloader randomness, fix EFI boot for
the Raspberry Pi2, fix efi_test permissions, etc"
* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
efi/efi_test: Lock down /dev/efi_test and require CAP_SYS_ADMIN
x86, efi: Never relocate kernel below lowest acceptable address
efi: libstub/arm: Account for firmware reserved memory at the base of RAM
efi/random: Treat EFI_RNG_PROTOCOL output as bootloader randomness
efi/tpm: Return -EINVAL when determining tpm final events log size fails
efi: Make CONFIG_EFI_RCI2_TABLE selectable on x86 only
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Pull rdma fixes from Jason Gunthorpe:
"A number of bug fixes and a regression fix:
- Various issues from static analysis in hfi1, uverbs, hns, and cxgb4
- Fix for deadlock in a case when the new auto RDMA module loading is
used
- Missing _irq notation in a prior -rc patch found by lockdep
- Fix a locking and lifetime issue in siw
- Minor functional bug fixes in cxgb4, mlx5, qedr
- Fix a regression where vlan interfaces no longer worked with RDMA
CM in some cases"
* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
RDMA/hns: Prevent memory leaks of eq->buf_list
RDMA/iw_cxgb4: Avoid freeing skb twice in arp failure case
RDMA/mlx5: Use irq xarray locking for mkey_table
IB/core: Avoid deadlock during netlink message handling
RDMA/nldev: Skip counter if port doesn't match
RDMA/uverbs: Prevent potential underflow
IB/core: Use rdma_read_gid_l2_fields to compare GID L2 fields
RDMA/qedr: Fix reported firmware version
RDMA/siw: free siw_base_qp in kref release routine
RDMA/iwcm: move iw_rem_ref() calls out of spinlock
iw_cxgb4: fix ECN check on the passive accept
IB/hfi1: Use a common pad buffer for 9B and 16B packets
IB/hfi1: Avoid excessive retry for TID RDMA READ request
RDMA/mlx5: Clear old rate limit when closing QP
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SOMAXCONN is /proc/sys/net/core/somaxconn default value.
It has been defined as 128 more than 20 years ago.
Since it caps the listen() backlog values, the very small value has
caused numerous problems over the years, and many people had
to raise it on their hosts after beeing hit by problems.
Google has been using 1024 for at least 15 years, and we increased
this to 4096 after TCP listener rework has been completed, more than
4 years ago. We got no complain of this change breaking any
legacy application.
Many applications indeed setup a TCP listener with listen(fd, -1);
meaning they let the system select the backlog.
Raising SOMAXCONN lowers chance of the port being unavailable under
even small SYNFLOOD attack, and reduces possibilities of side channel
vulnerabilities.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Yue Cao <ycao009@ucr.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The driver exposes EFI runtime services to user-space through an IOCTL
interface, calling the EFI services function pointers directly without
using the efivar API.
Disallow access to the /dev/efi_test character device when the kernel is
locked down to prevent arbitrary user-space to call EFI runtime services.
Also require CAP_SYS_ADMIN to open the chardev to prevent unprivileged
users to call the EFI runtime services, instead of just relying on the
chardev file mode bits for this.
The main user of this driver is the fwts [0] tool that already checks if
the effective user ID is 0 and fails otherwise. So this change shouldn't
cause any regression to this tool.
[0]: https://wiki.ubuntu.com/FirmwareTestSuite/Reference/uefivarinfo
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Acked-by: Matthew Garrett <mjg59@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: https://lkml.kernel.org/r/20191029173755.27149-7-ardb@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Currently, kernel fails to boot on some HyperV VMs when using EFI.
And it's a potential issue on all x86 platforms.
It's caused by broken kernel relocation on EFI systems, when below three
conditions are met:
1. Kernel image is not loaded to the default address (LOAD_PHYSICAL_ADDR)
by the loader.
2. There isn't enough room to contain the kernel, starting from the
default load address (eg. something else occupied part the region).
3. In the memmap provided by EFI firmware, there is a memory region
starts below LOAD_PHYSICAL_ADDR, and suitable for containing the
kernel.
EFI stub will perform a kernel relocation when condition 1 is met. But
due to condition 2, EFI stub can't relocate kernel to the preferred
address, so it fallback to ask EFI firmware to alloc lowest usable memory
region, got the low region mentioned in condition 3, and relocated
kernel there.
It's incorrect to relocate the kernel below LOAD_PHYSICAL_ADDR. This
is the lowest acceptable kernel relocation address.
The first thing goes wrong is in arch/x86/boot/compressed/head_64.S.
Kernel decompression will force use LOAD_PHYSICAL_ADDR as the output
address if kernel is located below it. Then the relocation before
decompression, which move kernel to the end of the decompression buffer,
will overwrite other memory region, as there is no enough memory there.
To fix it, just don't let EFI stub relocate the kernel to any address
lower than lowest acceptable address.
[ ardb: introduce efi_low_alloc_above() to reduce the scope of the change ]
Signed-off-by: Kairui Song <kasong@redhat.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: https://lkml.kernel.org/r/20191029173755.27149-6-ardb@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
|
git://git.infradead.org/users/vkoul/slave-dma
Pull dmaengine fixes from Vinod Koul:
"A few fixes to the dmaengine drivers:
- fix in sprd driver for link list and potential memory leak
- tegra transfer failure fix
- imx size check fix for script_number
- xilinx fix for 64bit AXIDMA and control reg update
- qcom bam dma resource leak fix
- cppi slave transfer fix when idle"
* tag 'dmaengine-fix-5.4-rc6' of git://git.infradead.org/users/vkoul/slave-dma:
dmaengine: cppi41: Fix cppi41_dma_prep_slave_sg() when idle
dmaengine: qcom: bam_dma: Fix resource leak
dmaengine: sprd: Fix the possible memory leak issue
dmaengine: xilinx_dma: Fix control reg update in vdma_channel_set_config
dmaengine: xilinx_dma: Fix 64-bit simple AXIDMA transfer
dmaengine: imx-sdma: fix size check for sdma script_number
dmaengine: tegra210-adma: fix transfer failure
dmaengine: sprd: Fix the link-list pointer register configuration issue
|
|
We already annotated most accesses to sk->sk_napi_id
We missed sk_mark_napi_id() and sk_mark_napi_id_once()
which might be called without socket lock held in UDP stack.
KCSAN reported :
BUG: KCSAN: data-race in udpv6_queue_rcv_one_skb / udpv6_queue_rcv_one_skb
write to 0xffff888121c6d108 of 4 bytes by interrupt on cpu 0:
sk_mark_napi_id include/net/busy_poll.h:125 [inline]
__udpv6_queue_rcv_skb net/ipv6/udp.c:571 [inline]
udpv6_queue_rcv_one_skb+0x70c/0xb40 net/ipv6/udp.c:672
udpv6_queue_rcv_skb+0xb5/0x400 net/ipv6/udp.c:689
udp6_unicast_rcv_skb.isra.0+0xd7/0x180 net/ipv6/udp.c:832
__udp6_lib_rcv+0x69c/0x1770 net/ipv6/udp.c:913
udpv6_rcv+0x2b/0x40 net/ipv6/udp.c:1015
ip6_protocol_deliver_rcu+0x22a/0xbe0 net/ipv6/ip6_input.c:409
ip6_input_finish+0x30/0x50 net/ipv6/ip6_input.c:450
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
ip6_input+0x177/0x190 net/ipv6/ip6_input.c:459
dst_input include/net/dst.h:442 [inline]
ip6_rcv_finish+0x110/0x140 net/ipv6/ip6_input.c:76
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
ipv6_rcv+0x1a1/0x1b0 net/ipv6/ip6_input.c:284
__netif_receive_skb_one_core+0xa7/0xe0 net/core/dev.c:5010
__netif_receive_skb+0x37/0xf0 net/core/dev.c:5124
process_backlog+0x1d3/0x420 net/core/dev.c:5955
napi_poll net/core/dev.c:6392 [inline]
net_rx_action+0x3ae/0xa90 net/core/dev.c:6460
write to 0xffff888121c6d108 of 4 bytes by interrupt on cpu 1:
sk_mark_napi_id include/net/busy_poll.h:125 [inline]
__udpv6_queue_rcv_skb net/ipv6/udp.c:571 [inline]
udpv6_queue_rcv_one_skb+0x70c/0xb40 net/ipv6/udp.c:672
udpv6_queue_rcv_skb+0xb5/0x400 net/ipv6/udp.c:689
udp6_unicast_rcv_skb.isra.0+0xd7/0x180 net/ipv6/udp.c:832
__udp6_lib_rcv+0x69c/0x1770 net/ipv6/udp.c:913
udpv6_rcv+0x2b/0x40 net/ipv6/udp.c:1015
ip6_protocol_deliver_rcu+0x22a/0xbe0 net/ipv6/ip6_input.c:409
ip6_input_finish+0x30/0x50 net/ipv6/ip6_input.c:450
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
ip6_input+0x177/0x190 net/ipv6/ip6_input.c:459
dst_input include/net/dst.h:442 [inline]
ip6_rcv_finish+0x110/0x140 net/ipv6/ip6_input.c:76
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
ipv6_rcv+0x1a1/0x1b0 net/ipv6/ip6_input.c:284
__netif_receive_skb_one_core+0xa7/0xe0 net/core/dev.c:5010
__netif_receive_skb+0x37/0xf0 net/core/dev.c:5124
process_backlog+0x1d3/0x420 net/core/dev.c:5955
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10890 Comm: syz-executor.0 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Fixes: e68b6e50fa35 ("udp: enable busy polling for all sockets")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
This socket field can be read and written by concurrent cpus.
Use READ_ONCE() and WRITE_ONCE() annotations to document this,
and avoid some compiler 'optimizations'.
KCSAN reported :
BUG: KCSAN: data-race in tcp_v4_rcv / tcp_v4_rcv
write to 0xffff88812220763c of 4 bytes by interrupt on cpu 0:
sk_incoming_cpu_update include/net/sock.h:953 [inline]
tcp_v4_rcv+0x1b3c/0x1bb0 net/ipv4/tcp_ipv4.c:1934
ip_protocol_deliver_rcu+0x4d/0x420 net/ipv4/ip_input.c:204
ip_local_deliver_finish+0x110/0x140 net/ipv4/ip_input.c:231
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
ip_local_deliver+0x133/0x210 net/ipv4/ip_input.c:252
dst_input include/net/dst.h:442 [inline]
ip_rcv_finish+0x121/0x160 net/ipv4/ip_input.c:413
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
ip_rcv+0x18f/0x1a0 net/ipv4/ip_input.c:523
__netif_receive_skb_one_core+0xa7/0xe0 net/core/dev.c:5010
__netif_receive_skb+0x37/0xf0 net/core/dev.c:5124
process_backlog+0x1d3/0x420 net/core/dev.c:5955
napi_poll net/core/dev.c:6392 [inline]
net_rx_action+0x3ae/0xa90 net/core/dev.c:6460
__do_softirq+0x115/0x33f kernel/softirq.c:292
do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082
do_softirq.part.0+0x6b/0x80 kernel/softirq.c:337
do_softirq kernel/softirq.c:329 [inline]
__local_bh_enable_ip+0x76/0x80 kernel/softirq.c:189
read to 0xffff88812220763c of 4 bytes by interrupt on cpu 1:
sk_incoming_cpu_update include/net/sock.h:952 [inline]
tcp_v4_rcv+0x181a/0x1bb0 net/ipv4/tcp_ipv4.c:1934
ip_protocol_deliver_rcu+0x4d/0x420 net/ipv4/ip_input.c:204
ip_local_deliver_finish+0x110/0x140 net/ipv4/ip_input.c:231
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
ip_local_deliver+0x133/0x210 net/ipv4/ip_input.c:252
dst_input include/net/dst.h:442 [inline]
ip_rcv_finish+0x121/0x160 net/ipv4/ip_input.c:413
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
ip_rcv+0x18f/0x1a0 net/ipv4/ip_input.c:523
__netif_receive_skb_one_core+0xa7/0xe0 net/core/dev.c:5010
__netif_receive_skb+0x37/0xf0 net/core/dev.c:5124
process_backlog+0x1d3/0x420 net/core/dev.c:5955
napi_poll net/core/dev.c:6392 [inline]
net_rx_action+0x3ae/0xa90 net/core/dev.c:6460
__do_softirq+0x115/0x33f kernel/softirq.c:292
run_ksoftirqd+0x46/0x60 kernel/softirq.c:603
smpboot_thread_fn+0x37d/0x4a0 kernel/smpboot.c:165
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
When we're destroying the host transport mechanism, we should ensure
that we do not leak memory by failing to release any back channel
slots that might still exist.
Reported-by: Neil Brown <neilb@suse.de>
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
|
|
The union should contain the extended dest and counter list.
Remove the resevered 0x40 bits which is redundant.
This change doesn't break any functionally.
Everything works today because the code in fs_cmd.c is using
the correct structs if extended dest or the basic dest.
Fixes: 1b115498598f ("net/mlx5: Introduce extended destination fields")
Signed-off-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse
Pull fuse fixes from Miklos Szeredi:
"Mostly virtiofs fixes, but also fixes a regression and couple of
longstanding data/metadata writeback ordering issues"
* tag 'fuse-fixes-5.4-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
fuse: redundant get_fuse_inode() calls in fuse_writepages_fill()
fuse: Add changelog entries for protocols 7.1 - 7.8
fuse: truncate pending writes on O_TRUNC
fuse: flush dirty data/metadata before non-truncate setattr
virtiofs: Remove set but not used variable 'fc'
virtiofs: Retry request submission from worker context
virtiofs: Count pending forgets as in_flight forgets
virtiofs: Set FR_SENT flag only after request has been sent
virtiofs: No need to check fpq->connected state
virtiofs: Do not end request in submission context
fuse: don't advise readdirplus for negative lookup
fuse: don't dereference req->args on finished request
virtio-fs: don't show mount options
virtio-fs: Change module name to virtiofs.ko
|
|
sk_page_frag() optimizes skb_frag allocations by using per-task
skb_frag cache when it knows it's the only user. The condition is
determined by seeing whether the socket allocation mask allows
blocking - if the allocation may block, it obviously owns the task's
context and ergo exclusively owns current->task_frag.
Unfortunately, this misses recursion through memory reclaim path.
Please take a look at the following backtrace.
[2] RIP: 0010:tcp_sendmsg_locked+0xccf/0xe10
...
tcp_sendmsg+0x27/0x40
sock_sendmsg+0x30/0x40
sock_xmit.isra.24+0xa1/0x170 [nbd]
nbd_send_cmd+0x1d2/0x690 [nbd]
nbd_queue_rq+0x1b5/0x3b0 [nbd]
__blk_mq_try_issue_directly+0x108/0x1b0
blk_mq_request_issue_directly+0xbd/0xe0
blk_mq_try_issue_list_directly+0x41/0xb0
blk_mq_sched_insert_requests+0xa2/0xe0
blk_mq_flush_plug_list+0x205/0x2a0
blk_flush_plug_list+0xc3/0xf0
[1] blk_finish_plug+0x21/0x2e
_xfs_buf_ioapply+0x313/0x460
__xfs_buf_submit+0x67/0x220
xfs_buf_read_map+0x113/0x1a0
xfs_trans_read_buf_map+0xbf/0x330
xfs_btree_read_buf_block.constprop.42+0x95/0xd0
xfs_btree_lookup_get_block+0x95/0x170
xfs_btree_lookup+0xcc/0x470
xfs_bmap_del_extent_real+0x254/0x9a0
__xfs_bunmapi+0x45c/0xab0
xfs_bunmapi+0x15/0x30
xfs_itruncate_extents_flags+0xca/0x250
xfs_free_eofblocks+0x181/0x1e0
xfs_fs_destroy_inode+0xa8/0x1b0
destroy_inode+0x38/0x70
dispose_list+0x35/0x50
prune_icache_sb+0x52/0x70
super_cache_scan+0x120/0x1a0
do_shrink_slab+0x120/0x290
shrink_slab+0x216/0x2b0
shrink_node+0x1b6/0x4a0
do_try_to_free_pages+0xc6/0x370
try_to_free_mem_cgroup_pages+0xe3/0x1e0
try_charge+0x29e/0x790
mem_cgroup_charge_skmem+0x6a/0x100
__sk_mem_raise_allocated+0x18e/0x390
__sk_mem_schedule+0x2a/0x40
[0] tcp_sendmsg_locked+0x8eb/0xe10
tcp_sendmsg+0x27/0x40
sock_sendmsg+0x30/0x40
___sys_sendmsg+0x26d/0x2b0
__sys_sendmsg+0x57/0xa0
do_syscall_64+0x42/0x100
entry_SYSCALL_64_after_hwframe+0x44/0xa9
In [0], tcp_send_msg_locked() was using current->page_frag when it
called sk_wmem_schedule(). It already calculated how many bytes can
be fit into current->page_frag. Due to memory pressure,
sk_wmem_schedule() called into memory reclaim path which called into
xfs and then IO issue path. Because the filesystem in question is
backed by nbd, the control goes back into the tcp layer - back into
tcp_sendmsg_locked().
nbd sets sk_allocation to (GFP_NOIO | __GFP_MEMALLOC) which makes
sense - it's in the process of freeing memory and wants to be able to,
e.g., drop clean pages to make forward progress. However, this
confused sk_page_frag() called from [2]. Because it only tests
whether the allocation allows blocking which it does, it now thinks
current->page_frag can be used again although it already was being
used in [0].
After [2] used current->page_frag, the offset would be increased by
the used amount. When the control returns to [0],
current->page_frag's offset is increased and the previously calculated
number of bytes now may overrun the end of allocated memory leading to
silent memory corruptions.
Fix it by adding gfpflags_normal_context() which tests sleepable &&
!reclaim and use it to determine whether to use current->task_frag.
v2: Eric didn't like gfp flags being tested twice. Introduce a new
helper gfpflags_normal_context() and combine the two tests.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
Some paths call skb_queue_empty() without holding
the queue lock. We must use a barrier in order
to not let the compiler do strange things, and avoid
KCSAN splats.
Adding a barrier in skb_queue_empty() might be overkill,
I prefer adding a new helper to clearly identify
points where the callers might be lockless. This might
help us finding real bugs.
The corresponding WRITE_ONCE() should add zero cost
for current compilers.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
Pull virtio fixes from Michael Tsirkin:
"Some minor fixes"
* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
vringh: fix copy direction of vringh_iov_push_kern()
vsock/virtio: remove unused 'work' field from 'struct virtio_vsock_pkt'
virtio_ring: fix stalls for packed rings
|
|
As per POSIX, the correct spelling of the error code is EACCES:
include/uapi/asm-generic/errno-base.h:#define EACCES 13 /* Permission denied */
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Kosina <trivial@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: https://lkml.kernel.org/r/20191024122904.12463-1-geert+renesas@glider.be
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
|
The 'work' field was introduced with commit 06a8fc78367d0
("VSOCK: Introduce virtio_vsock_common.ko")
but it is never used in the code, so we can remove it to save
memory allocated in the per-packet 'struct virtio_vsock_pkt'
Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
|
|
Pablo Neira Ayuso says:
====================
Netfilter/IPVS fixes for net
The following patchset contains Netfilter/IPVS fixes for net:
1) Fix crash on flowtable due to race between garbage collection
and insertion.
2) Restore callback unbinding in netfilter offloads.
3) Fix races on IPVS module removal, from Davide Caratti.
4) Make old_secure_tcp per-netns to fix sysbot report,
from Eric Dumazet.
5) Validate matching length in netfilter offloads, from wenxu.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
Daniel Borkmann says:
====================
pull-request: bpf 2019-10-27
The following pull-request contains BPF updates for your *net* tree.
We've added 7 non-merge commits during the last 11 day(s) which contain
a total of 7 files changed, 66 insertions(+), 16 deletions(-).
The main changes are:
1) Fix two use-after-free bugs in relation to RCU in jited symbol exposure to
kallsyms, from Daniel Borkmann.
2) Fix NULL pointer dereference in AF_XDP rx-only sockets, from Magnus Karlsson.
3) Fix hang in netdev unregister for hash based devmap as well as another overflow
bug on 32 bit archs in memlock cost calculation, from Toke Høiland-Jørgensen.
4) Fix wrong memory access in LWT BPF programs on reroute due to invalid dst.
Also fix BPF selftests to use more compatible nc options, from Jiri Benc.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core fix from Greg KH:
"Here is a single sysfs fix for 5.4-rc5.
It resolves an error if you actually try to use the __BIN_ATTR_WO()
macro, seems I never tested it properly before :(
This has been in linux-next for a while with no reported issues"
* tag 'driver-core-5.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
sysfs: Fixes __BIN_ATTR_WO() macro
|
|
In rtnl_net_notifyid(), we certainly can't pass a null GFP flag to
rtnl_notify(). A GFP_KERNEL flag would be fine in most circumstances,
but there are a few paths calling rtnl_net_notifyid() from atomic
context or from RCU critical sections. The later also precludes the use
of gfp_any() as it wouldn't detect the RCU case. Also, the nlmsg_new()
call is wrong too, as it uses GFP_KERNEL unconditionally.
Therefore, we need to pass the GFP flags as parameter and propagate it
through function calls until the proper flags can be determined.
In most cases, GFP_KERNEL is fine. The exceptions are:
* openvswitch: ovs_vport_cmd_get() and ovs_vport_cmd_dump()
indirectly call rtnl_net_notifyid() from RCU critical section,
* rtnetlink: rtmsg_ifinfo_build_skb() already receives GFP flags as
parameter.
Also, in ovs_vport_cmd_build_info(), let's change the GFP flags used
by nlmsg_new(). The function is allowed to sleep, so better make the
flags consistent with the ones used in the following
ovs_vport_cmd_fill_info() call.
Found by code inspection.
Fixes: 9a9634545c70 ("netns: notify netns id events")
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
If CONFIG_NET_HWBM is not set, then these stub functions in
<net/hwbm.h> should be declared static to avoid trying to
export them from any driver that includes this.
Fixes the following sparse warnings:
./include/net/hwbm.h:24:6: warning: symbol 'hwbm_buf_free' was not declared. Should it be static?
./include/net/hwbm.h:25:5: warning: symbol 'hwbm_pool_refill' was not declared. Should it be static?
./include/net/hwbm.h:26:5: warning: symbol 'hwbm_pool_add' was not declared. Should it be static?
Signed-off-by: Ben Dooks (Codethink) <ben.dooks@codethink.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux
Pull modules fixes from Jessica Yu:
- Revert __ksymtab_$namespace.$symbol naming scheme back to
__ksymtab_$symbol, as it was causing issues with depmod.
Instead, have modpost extract a symbol's namespace from __kstrtabns
and __ksymtab_strings.
- Fix `make nsdeps` for out of tree kernel builds (make O=...) caused
by unescaped '/'.
Use a different sed delimiter to avoid this problem.
* tag 'modules-for-v5.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux:
scripts/nsdeps: use alternative sed delimiter
symbol namespaces: revert to previous __ksymtab name scheme
modpost: make updating the symbol namespace explicit
modpost: delegate updating namespaces to separate function
|
|
This patch removes variables and callback these are related to the nested
device structure.
devices that can be nested have their own nest_level variable that
represents the depth of nested devices.
In the previous patch, new {lower/upper}_level variables are added and
they replace old private nest_level variable.
So, this patch removes all 'nest_level' variables.
In order to avoid lockdep warning, ->ndo_get_lock_subclass() was added
to get lockdep subclass value, which is actually lower nested depth value.
But now, they use the dynamic lockdep key to avoid lockdep warning instead
of the subclass.
So, this patch removes ->ndo_get_lock_subclass() callback.
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
Current vxlan code doesn't limit the number of nested devices.
Nested devices would be handled recursively and this routine needs
huge stack memory. So, unlimited nested devices could make
stack overflow.
In order to fix this issue, this patch adds adjacent links.
The adjacent link APIs internally check the depth level.
Test commands:
ip link add dummy0 type dummy
ip link add vxlan0 type vxlan id 0 group 239.1.1.1 dev dummy0 \
dstport 4789
for i in {1..100}
do
let A=$i-1
ip link add vxlan$i type vxlan id $i group 239.1.1.1 \
dev vxlan$A dstport 4789
done
ip link del dummy0
The top upper link is vxlan100 and the lowest link is vxlan0.
When vxlan0 is deleting, the upper devices will be deleted recursively.
It needs huge stack memory so it makes stack overflow.
Splat looks like:
[ 229.628477] =============================================================================
[ 229.629785] BUG page->ptl (Not tainted): Padding overwritten. 0x0000000026abf214-0x0000000091f6abb2
[ 229.629785] -----------------------------------------------------------------------------
[ 229.629785]
[ 229.655439] ==================================================================
[ 229.629785] INFO: Slab 0x00000000ff7cfda8 objects=19 used=19 fp=0x00000000fe33776c flags=0x200000000010200
[ 229.655688] BUG: KASAN: stack-out-of-bounds in unmap_single_vma+0x25a/0x2e0
[ 229.655688] Read of size 8 at addr ffff888113076928 by task vlan-network-in/2334
[ 229.655688]
[ 229.629785] Padding 0000000026abf214: 00 80 14 0d 81 88 ff ff 68 91 81 14 81 88 ff ff ........h.......
[ 229.629785] Padding 0000000001e24790: 38 91 81 14 81 88 ff ff 68 91 81 14 81 88 ff ff 8.......h.......
[ 229.629785] Padding 00000000b39397c8: 33 30 62 a7 ff ff ff ff ff eb 60 22 10 f1 ff 1f 30b.......`"....
[ 229.629785] Padding 00000000bc98f53a: 80 60 07 13 81 88 ff ff 00 80 14 0d 81 88 ff ff .`..............
[ 229.629785] Padding 000000002aa8123d: 68 91 81 14 81 88 ff ff f7 21 17 a7 ff ff ff ff h........!......
[ 229.629785] Padding 000000001c8c2369: 08 81 14 0d 81 88 ff ff 03 02 00 00 00 00 00 00 ................
[ 229.629785] Padding 000000004e290c5d: 21 90 a2 21 10 ed ff ff 00 00 00 00 00 fc ff df !..!............
[ 229.629785] Padding 000000000e25d731: 18 60 07 13 81 88 ff ff c0 8b 13 05 81 88 ff ff .`..............
[ 229.629785] Padding 000000007adc7ab3: b3 8a b5 41 00 00 00 00 ...A....
[ 229.629785] FIX page->ptl: Restoring 0x0000000026abf214-0x0000000091f6abb2=0x5a
[ ... ]
Fixes: acaf4e70997f ("net: vxlan: when lower dev unregisters remove vxlan dev as well")
Signed-off-by: Taehee Yoo <ap42 |
