There's some daring kernel code out there which dumps the stack of
another task without first making sure the task is inactive. If the
task happens to be running while the unwinder is reading the stack,
unusual unwinder warnings can result.
There's no race-free way for the unwinder to know whether such a warning
is legitimate, so just disable unwinder warnings for all non-current
tasks.
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Jones <dsj@fb.com>
Cc: Jann Horn <jannh@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: https://lore.kernel.org/r/ec424a2aea1d461eb30cab48a28c6433de2ab784.1587808742.git.jpoimboe@redhat.com
These variables aren't used outside of unwind_orc.c, make them static.
Also annotate some of them with '__ro_after_init', as applicable.
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Jones <dsj@fb.com>
Cc: Jann Horn <jannh@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: https://lore.kernel.org/r/43ae310bf7822b9862e571f36ae3474cfde8f301.1587808742.git.jpoimboe@redhat.com
The LEAQ instruction in rewind_stack_do_exit() moves the stack pointer
directly below the pt_regs at the top of the task stack before calling
do_exit(). Tell the unwinder to expect pt_regs.
Fixes: 8c1f75587a ("x86/entry/64: Add unwind hint annotations")
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Jones <dsj@fb.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: https://lore.kernel.org/r/68c33e17ae5963854916a46f522624f8e1d264f2.1587808742.git.jpoimboe@redhat.com
UNWIND_HINT_FUNC has some limitations: specifically, it doesn't reset
all the registers to undefined. This causes objtool to get confused
about the RBP push in __switch_to_asm(), resulting in bad ORC data.
While __switch_to_asm() does do some stack magic, it's otherwise a
normal callable-from-C function, so just annotate it as a function,
which makes objtool happy and allows it to produces the correct hints
automatically.
Fixes: 8c1f75587a ("x86/entry/64: Add unwind hint annotations")
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Jones <dsj@fb.com>
Cc: Jann Horn <jannh@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: https://lore.kernel.org/r/03d0411920d10f7418f2e909210d8e9a3b2ab081.1587808742.git.jpoimboe@redhat.com
In swapgs_restore_regs_and_return_to_usermode, after the stack is
switched to the trampoline stack, the existing UNWIND_HINT_REGS hint is
no longer valid, which can result in the following ORC unwinder warning:
WARNING: can't dereference registers at 000000003aeb0cdd for ip swapgs_restore_regs_and_return_to_usermode+0x93/0xa0
For full correctness, we could try to add complicated unwind hints so
the unwinder could continue to find the registers, but when when it's
this close to kernel exit, unwind hints aren't really needed anymore and
it's fine to just use an empty hint which tells the unwinder to stop.
For consistency, also move the UNWIND_HINT_EMPTY in
entry_SYSCALL_64_after_hwframe to a similar location.
Fixes: 3e3b9293d3 ("x86/entry/64: Return to userspace from the trampoline stack")
Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Reported-by: Dave Jones <dsj@fb.com>
Reported-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reported-by: Joe Mario <jmario@redhat.com>
Reported-by: Jann Horn <jannh@google.com>
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/60ea8f562987ed2d9ace2977502fe481c0d7c9a0.1587808742.git.jpoimboe@redhat.com
The PUSH_AND_CLEAR_REGS macro zeroes each register immediately after
pushing it. If an NMI or exception hits after a register is cleared,
but before the UNWIND_HINT_REGS annotation, the ORC unwinder will
wrongly think the previous value of the register was zero. This can
confuse the unwinding process and cause it to exit early.
Because ORC is simpler than DWARF, there are a limited number of unwind
annotation states, so it's not possible to add an individual unwind hint
after each push/clear combination. Instead, the register clearing
instructions need to be consolidated and moved to after the
UNWIND_HINT_REGS annotation.
Fixes: 3f01daecd5 ("x86/entry/64: Introduce the PUSH_AND_CLEAN_REGS macro")
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Jones <dsj@fb.com>
Cc: Jann Horn <jannh@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: https://lore.kernel.org/r/68fd3d0bc92ae2d62ff7879d15d3684217d51f08.1587808742.git.jpoimboe@redhat.com
Pull networking fixes from David Miller:
1) Fix memory leak in netfilter flowtable, from Roi Dayan.
2) Ref-count leaks in netrom and tipc, from Xiyu Yang.
3) Fix warning when mptcp socket is never accepted before close, from
Florian Westphal.
4) Missed locking in ovs_ct_exit(), from Tonghao Zhang.
5) Fix large delays during PTP synchornization in cxgb4, from Rahul
Lakkireddy.
6) team_mode_get() can hang, from Taehee Yoo.
7) Need to use kvzalloc() when allocating fw tracer in mlx5 driver,
from Niklas Schnelle.
8) Fix handling of bpf XADD on BTF memory, from Jann Horn.
9) Fix BPF_STX/BPF_B encoding in x86 bpf jit, from Luke Nelson.
10) Missing queue memory release in iwlwifi pcie code, from Johannes
Berg.
11) Fix NULL deref in macvlan device event, from Taehee Yoo.
12) Initialize lan87xx phy correctly, from Yuiko Oshino.
13) Fix looping between VRF and XFRM lookups, from David Ahern.
14) etf packet scheduler assumes all sockets are full sockets, which is
not necessarily true. From Eric Dumazet.
15) Fix mptcp data_fin handling in RX path, from Paolo Abeni.
16) fib_select_default() needs to handle nexthop objects, from David
Ahern.
17) Use GFP_ATOMIC under spinlock in mac80211_hwsim, from Wei Yongjun.
18) vxlan and geneve use wrong nlattr array, from Sabrina Dubroca.
19) Correct rx/tx stats in bcmgenet driver, from Doug Berger.
20) BPF_LDX zero-extension is encoded improperly in x86_32 bpf jit, fix
from Luke Nelson.
* git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (100 commits)
selftests/bpf: Fix a couple of broken test_btf cases
tools/runqslower: Ensure own vmlinux.h is picked up first
bpf: Make bpf_link_fops static
bpftool: Respect the -d option in struct_ops cmd
selftests/bpf: Add test for freplace program with expected_attach_type
bpf: Propagate expected_attach_type when verifying freplace programs
bpf: Fix leak in LINK_UPDATE and enforce empty old_prog_fd
bpf, x86_32: Fix logic error in BPF_LDX zero-extension
bpf, x86_32: Fix clobbering of dst for BPF_JSET
bpf, x86_32: Fix incorrect encoding in BPF_LDX zero-extension
bpf: Fix reStructuredText markup
net: systemport: suppress warnings on failed Rx SKB allocations
net: bcmgenet: suppress warnings on failed Rx SKB allocations
macsec: avoid to set wrong mtu
mac80211: sta_info: Add lockdep condition for RCU list usage
mac80211: populate debugfs only after cfg80211 init
net: bcmgenet: correct per TX/RX ring statistics
net: meth: remove spurious copyright text
net: phy: bcm84881: clear settings on link down
chcr: Fix CPU hard lockup
...
When verifier_zext is true, we don't need to emit code
for zero-extension.
Fixes: 836256bf5f ("x32: bpf: eliminate zero extension code-gen")
Signed-off-by: Wang YanQing <udknight@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200423050637.GA4029@udknight
The current JIT clobbers the destination register for BPF_JSET BPF_X
and BPF_K by using "and" and "or" instructions. This is fine when the
destination register is a temporary loaded from a register stored on
the stack but not otherwise.
This patch fixes the problem (for both BPF_K and BPF_X) by always loading
the destination register into temporaries since BPF_JSET should not
modify the destination register.
This bug may not be currently triggerable as BPF_REG_AX is the only
register not stored on the stack and the verifier uses it in a limited
way.
Fixes: 03f5781be2 ("bpf, x86_32: add eBPF JIT compiler for ia32")
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Luke Nelson <luke.r.nels@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Wang YanQing <udknight@gmail.com>
Link: https://lore.kernel.org/bpf/20200422173630.8351-2-luke.r.nels@gmail.com
The current JIT uses the following sequence to zero-extend into the
upper 32 bits of the destination register for BPF_LDX BPF_{B,H,W},
when the destination register is not on the stack:
EMIT3(0xC7, add_1reg(0xC0, dst_hi), 0);
The problem is that C7 /0 encodes a MOV instruction that requires a 4-byte
immediate; the current code emits only 1 byte of the immediate. This
means that the first 3 bytes of the next instruction will be treated as
the rest of the immediate, breaking the stream of instructions.
This patch fixes the problem by instead emitting "xor dst_hi,dst_hi"
to clear the upper 32 bits. This fixes the problem and is more efficient
than using MOV to load a zero immediate.
This bug may not be currently triggerable as BPF_REG_AX is the only
register not stored on the stack and the verifier uses it in a limited
way, and the verifier implements a zero-extension optimization. But the
JIT should avoid emitting incorrect encodings regardless.
Fixes: 03f5781be2 ("bpf, x86_32: add eBPF JIT compiler for ia32")
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Luke Nelson <luke.r.nels@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Acked-by: Wang YanQing <udknight@gmail.com>
Link: https://lore.kernel.org/bpf/20200422173630.8351-1-luke.r.nels@gmail.com
- fix scripts/config to properly handle ':' in string type CONFIG options
- fix unneeded rebuilds of DT schema check rule
- git rid of ordering dependency between <linux/vermagic.h> and
<linux/module.h> to fix build errors in some network drivers
- clean up generated headers of host arch with 'make ARCH=um mrproper'
-----BEGIN PGP SIGNATURE-----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=3L2c
-----END PGP SIGNATURE-----
Merge tag 'kbuild-fixes-v5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild fixes from Masahiro Yamada:
- fix scripts/config to properly handle ':' in string type CONFIG
options
- fix unneeded rebuilds of DT schema check rule
- git rid of ordering dependency between <linux/vermagic.h> and
<linux/module.h> to fix build errors in some network drivers
- clean up generated headers of host arch with 'make ARCH=um mrproper'
* tag 'kbuild-fixes-v5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
h8300: ignore vmlinux.lds
Documentation: kbuild: fix the section title format
um: ensure `make ARCH=um mrproper` removes arch/$(SUBARCH)/include/generated/
arch: split MODULE_ARCH_VERMAGIC definitions out to <asm/vermagic.h>
kbuild: fix DT binding schema rule again to avoid needless rebuilds
scripts/config: allow colons in option strings for sed
As the bug report [1] pointed out, <linux/vermagic.h> must be included
after <linux/module.h>.
I believe we should not impose any include order restriction. We often
sort include directives alphabetically, but it is just coding style
convention. Technically, we can include header files in any order by
making every header self-contained.
Currently, arch-specific MODULE_ARCH_VERMAGIC is defined in
<asm/module.h>, which is not included from <linux/vermagic.h>.
Hence, the straight-forward fix-up would be as follows:
|--- a/include/linux/vermagic.h
|+++ b/include/linux/vermagic.h
|@@ -1,5 +1,6 @@
| /* SPDX-License-Identifier: GPL-2.0 */
| #include <generated/utsrelease.h>
|+#include <linux/module.h>
|
| /* Simply sanity version stamp for modules. */
| #ifdef CONFIG_SMP
This works enough, but for further cleanups, I split MODULE_ARCH_VERMAGIC
definitions into <asm/vermagic.h>.
With this, <linux/module.h> and <linux/vermagic.h> will be orthogonal,
and the location of MODULE_ARCH_VERMAGIC definitions will be consistent.
For arc and ia64, MODULE_PROC_FAMILY is only used for defining
MODULE_ARCH_VERMAGIC. I squashed it.
For hexagon, nds32, and xtensa, I removed <asm/modules.h> entirely
because they contained nothing but MODULE_ARCH_VERMAGIC definition.
Kbuild will automatically generate <asm/modules.h> at build-time,
wrapping <asm-generic/module.h>.
[1] https://lore.kernel.org/lkml/20200411155623.GA22175@zn.tnic
Reported-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Jessica Yu <jeyu@kernel.org>
Merge misc fixes from Andrew Morton:
"15 fixes"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
tools/vm: fix cross-compile build
coredump: fix null pointer dereference on coredump
mm: shmem: disable interrupt when acquiring info->lock in userfaultfd_copy path
shmem: fix possible deadlocks on shmlock_user_lock
vmalloc: fix remap_vmalloc_range() bounds checks
mm/shmem: fix build without THP
mm/ksm: fix NULL pointer dereference when KSM zero page is enabled
tools/build: tweak unused value workaround
checkpatch: fix a typo in the regex for $allocFunctions
mm, gup: return EINTR when gup is interrupted by fatal signals
mm/hugetlb: fix a addressing exception caused by huge_pte_offset
MAINTAINERS: add an entry for kfifo
mm/userfaultfd: disable userfaultfd-wp on x86_32
slub: avoid redzone when choosing freepointer location
sh: fix build error in mm/init.c
This patch fixes an encoding bug in emit_stx for BPF_B when the source
register is BPF_REG_FP.
The current implementation for BPF_STX BPF_B in emit_stx saves one REX
byte when the operands can be encoded using Mod-R/M alone. The lower 8
bits of registers %rax, %rbx, %rcx, and %rdx can be accessed without using
a REX prefix via %al, %bl, %cl, and %dl, respectively. Other registers,
(e.g., %rsi, %rdi, %rbp, %rsp) require a REX prefix to use their 8-bit
equivalents (%sil, %dil, %bpl, %spl).
The current code checks if the source for BPF_STX BPF_B is BPF_REG_1
or BPF_REG_2 (which map to %rdi and %rsi), in which case it emits the
required REX prefix. However, it misses the case when the source is
BPF_REG_FP (mapped to %rbp).
The result is that BPF_STX BPF_B with BPF_REG_FP as the source operand
will read from register %ch instead of the correct %bpl. This patch fixes
the problem by fixing and refactoring the check on which registers need
the extra REX byte. Since no BPF registers map to %rsp, there is no need
to handle %spl.
Fixes: 622582786c ("net: filter: x86: internal BPF JIT")
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Luke Nelson <luke.r.nels@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200418232655.23870-1-luke.r.nels@gmail.com
Frame pointers are completely broken by vmenter.S because it clobbers
RBP:
arch/x86/kvm/svm/vmenter.o: warning: objtool: __svm_vcpu_run()+0xe4: BP used as a scratch register
That's unavoidable, so just skip checking that file when frame pointers
are configured in.
On the other hand, ORC can handle that code just fine, so leave objtool
enabled in the !FRAME_POINTER case.
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Message-Id: <01fae42917bacad18be8d2cbc771353da6603473.1587398610.git.jpoimboe@redhat.com>
Tested-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Fixes: 199cd1d7b5 ("KVM: SVM: Split svm_vcpu_run inline assembly to separate file")
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
objtool:
- Ignore the double UD2 which is emitted in BUG() when CONFIG_UBSAN_TRAP
is enabled.
- Support clang non-section symbols in objtool ORC dump
- Fix switch table detection in .text.unlikely
- Make the BP scratch register warning more robust.
x86:
- Increase microcode maximum patch size for AMD to cope with new CPUs
which have a larger patch size.
- Fix a crash in the resource control filesystem when the removal of the
default resource group is attempted.
- Preserve Code and Data Prioritization enabled state accross CPU
hotplug.
- Update split lock cpu matching to use the new X86_MATCH macros.
- Change the split lock enumeration as Intel finaly decided that the
IA32_CORE_CAPABILITIES bits are not architectural contrary to what
the SDM claims. !@#%$^!
- Add Tremont CPU models to the split lock detection cpu match.
- Add a missing static attribute to make sparse happy.
-----BEGIN PGP SIGNATURE-----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=raUm
-----END PGP SIGNATURE-----
Merge tag 'x86-urgent-2020-04-19' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 and objtool fixes from Thomas Gleixner:
"A set of fixes for x86 and objtool:
objtool:
- Ignore the double UD2 which is emitted in BUG() when
CONFIG_UBSAN_TRAP is enabled.
- Support clang non-section symbols in objtool ORC dump
- Fix switch table detection in .text.unlikely
- Make the BP scratch register warning more robust.
x86:
- Increase microcode maximum patch size for AMD to cope with new CPUs
which have a larger patch size.
- Fix a crash in the resource control filesystem when the removal of
the default resource group is attempted.
- Preserve Code and Data Prioritization enabled state accross CPU
hotplug.
- Update split lock cpu matching to use the new X86_MATCH macros.
- Change the split lock enumeration as Intel finaly decided that the
IA32_CORE_CAPABILITIES bits are not architectural contrary to what
the SDM claims. !@#%$^!
- Add Tremont CPU models to the split lock detection cpu match.
- Add a missing static attribute to make sparse happy"
* tag 'x86-urgent-2020-04-19' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/split_lock: Add Tremont family CPU models
x86/split_lock: Bits in IA32_CORE_CAPABILITIES are not architectural
x86/resctrl: Preserve CDP enable over CPU hotplug
x86/resctrl: Fix invalid attempt at removing the default resource group
x86/split_lock: Update to use X86_MATCH_INTEL_FAM6_MODEL()
x86/umip: Make umip_insns static
x86/microcode/AMD: Increase microcode PATCH_MAX_SIZE
objtool: Make BP scratch register warning more robust
objtool: Fix switch table detection in .text.unlikely
objtool: Support Clang non-section symbols in ORC generation
objtool: Support Clang non-section symbols in ORC dump
objtool: Fix CONFIG_UBSAN_TRAP unreachable warnings
Tremont CPUs support IA32_CORE_CAPABILITIES bits to indicate whether
specific SKUs have support for split lock detection.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200416205754.21177-4-tony.luck@intel.com
The Intel Software Developers' Manual erroneously listed bit 5 of the
IA32_CORE_CAPABILITIES register as an architectural feature. It is not.
Features enumerated by IA32_CORE_CAPABILITIES are model specific and
implementation details may vary in different cpu models. Thus it is only
safe to trust features after checking the CPU model.
Icelake client and server models are known to implement the split lock
detect feature even though they don't enumerate IA32_CORE_CAPABILITIES
[ tglx: Use switch() for readability and massage comments ]
Fixes: 6650cdd9a8 ("x86/split_lock: Enable split lock detection by kernel")
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200416205754.21177-3-tony.luck@intel.com
Resctrl assumes that all CPUs are online when the filesystem is mounted,
and that CPUs remember their CDP-enabled state over CPU hotplug.
This goes wrong when resctrl's CDP-enabled state changes while all the
CPUs in a domain are offline.
When a domain comes online, enable (or disable!) CDP to match resctrl's
current setting.
Fixes: 5ff193fbde ("x86/intel_rdt: Add basic resctrl filesystem support")
Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20200221162105.154163-1-james.morse@arm.com
Linux 3.14 unconditionally reads the RAPL PMU MSRs on boot, without handling
General Protection Faults on reading those MSRs. Rather than injecting a #GP,
which prevents boot, handle the MSRs by returning 0 for their data. Zero was
checked to be safe by code review of the RAPL PMU driver and in discussion
with the original driver author (eranian@google.com).
Signed-off-by: Venkatesh Srinivas <venkateshs@google.com>
Signed-off-by: Jon Cargille <jcargill@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Message-Id: <20200416184254.248374-1-jcargill@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Fixes a NULL pointer dereference, caused by the PIT firing an interrupt
before the interrupt table has been initialized.
SET_PIT2 can race with the creation of the IRQchip. In particular,
if SET_PIT2 is called with a low PIT timer period (after the creation of
the IOAPIC, but before the instantiation of the irq routes), the PIT can
fire an interrupt at an uninitialized table.
Signed-off-by: Steve Rutherford <srutherford@google.com>
Signed-off-by: Jon Cargille <jcargill@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Message-Id: <20200416191152.259434-1-jcargill@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The default resource group ("rdtgroup_default") is associated with the
root of the resctrl filesystem and should never be removed. New resource
groups can be created as subdirectories of the resctrl filesystem and
they can be removed from user space.
There exists a safeguard in the directory removal code
(rdtgroup_rmdir()) that ensures that only subdirectories can be removed
by testing that the directory to be removed has to be a child of the
root directory.
A possible deadlock was recently fixed with
334b0f4e9b ("x86/resctrl: Fix a deadlock due to inaccurate reference").
This fix involved associating the private data of the "mon_groups"
and "mon_data" directories to the resource group to which they belong
instead of NULL as before. A consequence of this change was that
the original safeguard code preventing removal of "mon_groups" and
"mon_data" found in the root directory failed resulting in attempts to
remove the default resource group that ends in a BUG:
kernel BUG at mm/slub.c:3969!
invalid opcode: 0000 [#1] SMP PTI
Call Trace:
rdtgroup_rmdir+0x16b/0x2c0
kernfs_iop_rmdir+0x5c/0x90
vfs_rmdir+0x7a/0x160
do_rmdir+0x17d/0x1e0
do_syscall_64+0x55/0x1d0
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Fix this by improving the directory removal safeguard to ensure that
subdirectories of the resctrl root directory can only be removed if they
are a child of the resctrl filesystem's root _and_ not associated with
the default resource group.
Fixes: 334b0f4e9b ("x86/resctrl: Fix a deadlock due to inaccurate reference")
Reported-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Tested-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/884cbe1773496b5dbec1b6bd11bb50cffa83603d.1584461853.git.reinette.chatre@intel.com
The SPLIT_LOCK_CPU() macro escaped the tree-wide sweep for old-style
initialization. Update to use X86_MATCH_INTEL_FAM6_MODEL().
Fixes: 6650cdd9a8 ("x86/split_lock: Enable split lock detection by kernel")
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200416205754.21177-2-tony.luck@intel.com
-----BEGIN PGP SIGNATURE-----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=dC6l
-----END PGP SIGNATURE-----
Merge tag 'efi-urgent-2020-04-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull EFI fixes from Ingo Molnar:
"Misc EFI fixes, including the boot failure regression caused by the
BSS section not being cleared by the loaders"
* tag 'efi-urgent-2020-04-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
efi/x86: Revert struct layout change to fix kexec boot regression
efi/x86: Don't remap text<->rodata gap read-only for mixed mode
efi/x86: Fix the deletion of variables in mixed mode
efi/libstub/file: Merge file name buffers to reduce stack usage
Documentation/x86, efi/x86: Clarify EFI handover protocol and its requirements
efi/arm: Deal with ADR going out of range in efi_enter_kernel()
efi/x86: Always relocate the kernel for EFI handover entry
efi/x86: Move efi stub globals from .bss to .data
efi/libstub/x86: Remove redundant assignment to pointer hdr
efi/cper: Use scnprintf() for avoiding potential buffer overflow
The function returns no value.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Fixes: 199cd1d7b5 ("KVM: SVM: Split svm_vcpu_run inline assembly to separate file")
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Message-Id: <20200409114926.1407442-1-ubizjak@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
__svm_vcpu_run is a leaf function and does not need
a frame pointer. %rbp is also destroyed a few instructions
later when guest registers are loaded.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Message-Id: <20200409120440.1427215-1-ubizjak@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Fix:
arch/x86/kvm/svm/sev.c: In function ‘sev_pin_memory’:
arch/x86/kvm/svm/sev.c:360:3: error: implicit declaration of function ‘release_pages’;\
did you mean ‘reclaim_pages’? [-Werror=implicit-function-declaration]
360 | release_pages(pages, npinned);
| ^~~~~~~~~~~~~
| reclaim_pages
because svm.c includes pagemap.h but the carved out sev.c needs it too.
Triggered by a randconfig build.
Fixes: eaf78265a4 ("KVM: SVM: Move SEV code to separate file")
Signed-off-by: Borislav Petkov <bp@suse.de>
Message-Id: <20200411160927.27954-1-bp@alien8.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
svm_vcpu_run does not change stack or frame pointer anymore.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Message-Id: <20200414113612.104501-1-ubizjak@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
nested_vmx_exit_reflected() returns a bool, not int. As such, refer to
the return values as true/false in the comment instead of 1/0.
Signed-off-by: Oliver Upton <oupton@google.com>
Message-Id: <20200414221241.134103-1-oupton@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
According to SDM 26.6.2, it is possible to inject an MTF VM-exit via the
VM-entry interruption-information field regardless of the 'monitor trap
flag' VM-execution control. KVM appropriately copies the VM-entry
interruption-information field from vmcs12 to vmcs02. However, if L1
has not set the 'monitor trap flag' VM-execution control, KVM fails to
reflect the subsequent MTF VM-exit into L1.
Fix this by consulting the VM-entry interruption-information field of
vmcs12 to determine if L1 has injected the MTF VM-exit. If so, reflect
the exit, regardless of the 'monitor trap flag' VM-execution control.
Fixes: 5f3d45e7f2 ("kvm/x86: add support for MONITOR_TRAP_FLAG")
Signed-off-by: Oliver Upton <oupton@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Message-Id: <20200414224746.240324-1-oupton@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Fix the following sparse warning:
arch/x86/kernel/umip.c:84:12: warning: symbol 'umip_insns' was not declared.
Should it be static?
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Link: https://lkml.kernel.org/r/20200413082213.22934-1-yanaijie@huawei.com
-----BEGIN PGP SIGNATURE-----
iQFHBAABCAAxFiEEIbPD0id6easf0xsudhRwX5BBoF4FAl6ViNsTHHdlaS5saXVA
a2VybmVsLm9yZwAKCRB2FHBfkEGgXuXIB/4nuYRCt4d/XaeHF6dCWU45ThG+tNs7
p/OnBPZmknI0SnZ4uR/XW5caHEFj7g9ndYh+M1afZ/zKdsc+syMSDT5XhuhC/GKV
fQRW0qO8N+IAqXbLzJxyBg6fH2anwfe3w2uy2cKDEZk6d4FD5atTWhRY6R4ISq0l
g7pUyvQN1q+G6KH2snmOaZL8mybFkbHrmwtAZzcjzdzqasdLFiQB8EEFkONG66t9
HeNTyUF0mnbGBIePQLSZSHLj5p4yHG/9pa3jgqO5dsmIdsBvoaVNqEi3pCm1s/5n
BH9FWn6fTwpcKvtF385yzBiFFlzBVgXbetxuSmxxOkWW4P+db5B/GL2Y
=fjSF
-----END PGP SIGNATURE-----
Merge tag 'hyperv-fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
Pull hyperv fixes from Wei Liu:
- a series from Tianyu Lan to fix crash reporting on Hyper-V
- three miscellaneous cleanup patches
* tag 'hyperv-fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
x86/Hyper-V: Report crash data in die() when panic_on_oops is set
x86/Hyper-V: Report crash register data when sysctl_record_panic_msg is not set
x86/Hyper-V: Report crash register data or kmsg before running crash kernel
x86/Hyper-V: Trigger crash enlightenment only once during system crash.
x86/Hyper-V: Free hv_panic_page when fail to register kmsg dump
x86/Hyper-V: Unload vmbus channel in hv panic callback
x86: hyperv: report value of misc_features
hv_debugfs: Make hv_debug_root static
hv: hyperv_vmbus.h: Replace zero-length array with flexible-array member
There is no reason to limit the use of do_machine_check
to 64bit targets. MCE handling works for both target familes.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: stable@vger.kernel.org
Fixes: a0861c02a9 ("KVM: Add VT-x machine check support")
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Message-Id: <20200414071414.45636-1-ubizjak@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Manipulate IF around vmload/vmsave to remove the confusing usage of
local_irq_enable where interrupts are actually disabled via GIF.
And stuff the RSB immediately without waiting for a RET to avoid
Spectre-v2 attacks.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Use svm_sev_enabled() in order to cull all calls to PSP code. Otherwise,
compilation fails with undefined symbols if the PSP device driver is compiled
as a module and KVM is not.
Reported-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Commit
0a67361dcd ("efi/x86: Remove runtime table address from kexec EFI setup data")
removed the code that retrieves the non-remapped UEFI runtime services
pointer from the data structure provided by kexec, as it was never really
needed on the kexec boot path: mapping the runtime services table at its
non-remapped address is only needed when calling SetVirtualAddressMap(),
which never happens during a kexec boot in the first place.
However, dropping the 'runtime' member from struct efi_setup_data was a
mistake. That struct is shared ABI between the kernel and the kexec tooling
for x86, and so we cannot simply change its layout. So let's put back the
removed field, but call it 'unused' to reflect the fact that we never look
at its contents. While at it, add a comment to remind our future selves
that the layout is external ABI.
Fixes: 0a67361dcd ("efi/x86: Remove runtime table address from kexec EFI setup data")
Reported-by: Theodore Ts'o <tytso@mit.edu>
Tested-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Commit
d9e3d2c4f1 ("efi/x86: Don't map the entire kernel text RW for mixed mode")
updated the code that creates the 1:1 memory mapping to use read-only
attributes for the 1:1 alias of the kernel's text and rodata sections, to
protect it from inadvertent modification. However, it failed to take into
account that the unused gap between text and rodata is given to the page
allocator for general use.
If the vmap'ed stack happens to be allocated from this region, any by-ref
output arguments passed to EFI runtime services that are allocated on the
stack (such as the 'datasize' argument taken by GetVariable() when invoked
from efivar_entry_size()) will be referenced via a read-only mapping,
resulting in a page fault if the EFI code tries to write to it:
BUG: unable to handle page fault for address: 00000000386aae88
#PF: supervisor write access in kernel mode
#PF: error_code(0x0003) - permissions violation
PGD fd61063 P4D fd61063 PUD fd62063 PMD 386000e1
Oops: 0003 [#1] SMP PTI
CPU: 2 PID: 255 Comm: systemd-sysv-ge Not tainted 5.6.0-rc4-default+ #22
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
RIP: 0008:0x3eaeed95
Code: ... <89> 03 be 05 00 00 80 a1 74 63 b1 3e 83 c0 48 e8 44 d2 ff ff eb 05
RSP: 0018:000000000fd73fa0 EFLAGS: 00010002
RAX: 0000000000000001 RBX: 00000000386aae88 RCX: 000000003e9f1120
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 000000000fd73fd8 R08: 00000000386aae88 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc0f040220000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f21160ac940(0000) GS:ffff9cf23d500000(0000) knlGS:0000000000000000
CS: 0008 DS: 0018 ES: 0018 CR0: 0000000080050033
CR2: 00000000386aae88 CR3: 000000000fd6c004 CR4: 00000000003606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Modules linked in:
CR2: 00000000386aae88
---[ end trace a8bfbd202e712834 ]---
Let's fix this by remapping text and rodata individually, and leave the
gaps mapped read-write.
Fixes: d9e3d2c4f1 ("efi/x86: Don't map the entire kernel text RW for mixed mode")
Reported-by: Jiri Slaby <jslaby@suse.cz>
Tested-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200409130434.6736-10-ardb@kernel.org
efi_thunk_set_variable() treated the NULL "data" pointer as an invalid
parameter, and this broke the deletion of variables in mixed mode.
This commit fixes the check of data so that the userspace program can
delete a variable in mixed mode.
Fixes: 8319e9d5ad ("efi/x86: Handle by-ref arguments covering multiple pages in mixed mode")
Signed-off-by: Gary Lin <glin@suse.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200408081606.1504-1-glin@suse.com
Link: https://lore.kernel.org/r/20200409130434.6736-9-ardb@kernel.org
detection feature.
It addressed the case where a KVM guest triggers a split lock #AC and KVM
reinjects it into the guest which is not prepared to handle it.
Adds proper sanity checks which prevent the unconditional injection into
the guest and handles the #AC on the host side in the same way as user
space detections are handled. Depending on the detection mode it either
warns and disables detection for the task or kills the task if the mode is
set to fatal.
-----BEGIN PGP SIGNATURE-----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=8FbL
-----END PGP SIGNATURE-----
Merge tag 'x86-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Thomas Gleixner:
"A set of three patches to fix the fallout of the newly added split
lock detection feature.
It addressed the case where a KVM guest triggers a split lock #AC and
KVM reinjects it into the guest which is not prepared to handle it.
Add proper sanity checks which prevent the unconditional injection
into the guest and handles the #AC on the host side in the same way as
user space detections are handled. Depending on the detection mode it
either warns and disables detection for the task or kills the task if
the mode is set to fatal"
* tag 'x86-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
KVM: VMX: Extend VMXs #AC interceptor to handle split lock #AC in guest
KVM: x86: Emulate split-lock access as a write in emulator
x86/split_lock: Provide handle_guest_split_lock()
- Fix the perf event cgroup tracking which tries to track the cgroup even
for disabled events.
- Add Ice Lake server support for uncore events
- Disable pagefaults when retrieving the physical address in the sampling
code.
-----BEGIN PGP SIGNATURE-----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=5kqD
-----END PGP SIGNATURE-----
Merge tag 'perf-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Thomas Gleixner:
"Three fixes/updates for perf:
- Fix the perf event cgroup tracking which tries to track the cgroup
even for disabled events.
- Add Ice Lake server support for uncore events
- Disable pagefaults when retrieving the physical address in the
sampling code"
* tag 'perf-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/core: Disable page faults when getting phys address
perf/x86/intel/uncore: Add Ice Lake server uncore support
perf/cgroup: Correct indirection in perf_less_group_idx()
perf/core: Fix event cgroup tracking
- raise minimum supported binutils version to 2.23
- remove old CONFIG_AS_* macros that we know binutils >= 2.23 supports
- move remaining CONFIG_AS_* tests to Kconfig from Makefile
- enable -Wtautological-compare warnings to catch more issues
- do not support GCC plugins for GCC <= 4.7
- fix various breakages of 'make xconfig'
- include the linker version used for linking the kernel into
LINUX_COMPILER, which is used for the banner, and also exposed to
/proc/version
- link lib-y objects to vmlinux forcibly when CONFIG_MODULES=y,
which allows us to remove the lib-ksyms.o workaround, and to
solve the last known issue of the LLVM linker
- add dummy tools in scripts/dummy-tools/ to enable all compiler
tests in Kconfig, which will be useful for distro maintainers
- support the single switch, LLVM=1 to use Clang and all LLVM utilities
instead of GCC and Binutils.
- support LLVM_IAS=1 to enable the integrated assembler, which is still
experimental
-----BEGIN PGP SIGNATURE-----
iQJJBAABCgAzFiEEbmPs18K1szRHjPqEPYsBB53g2wYFAl6RNqEVHG1hc2FoaXJv
eUBrZXJuZWwub3JnAAoJED2LAQed4NsGZPEP/3affmzIWJuKGF1RErOHK3KCe/uX
PmLjoRZ7im7V+J4b3W+p+re6BOXIXhW+rtKoP/Ijuys9g80WeeAb2nB4h0ESOtff
3NgN97v28mh4tVtbluJambFDXItei+UwDp1sgg2sZ7ehaSBVny9hgNmPRn5YcyoS
O3Juy85q70l8awBWThjEHgSxEw2Rzh9PLE6YmMt40rHTxVEDjMOPSuBlp/+TWj3X
ugF/wInp+J5mCAKCwJI4L6PavdwIwf9hg3Cv/DpoOw60TxwH+7Rq6RueDKBgHhe3
UEPHrXyPCsF/JQwwSFxN7k481RV2PjkXFwA3U5vH+3WIRb4ETX0+fmBIrLPSAX4z
6rZiEvdrGS4TVvW2i8mrkJUrLPHNyQ90q/FU0V18A1k77Cv7mWJjSebTAVYNvz/v
f/DxApaepwprdtHcNYJMN/TVnwxNexJK+U+bkuXsmDggvZYCxwLQUjtI3Sab1Rv9
C6Y8WgqKx8yP6NbqVtUMkwXdEhBiHgybVxkl9hseUEbhUElIViuq5rlrHa0FVt2Q
w4orgFXOd7k5iuDr7ka+wa3p20KLQQuB+vwLaCpi35+4vepQ7P0i2tFNwSclo7lO
+iNy4Bq20W0/cmQeUJIzctJGibwro1I3HPN1UJ7gp0fZ2WVGzV0SKpwQ0tLOVuuU
y9yPsL1ciDpKQKMh
=jpyF
-----END PGP SIGNATURE-----
Merge tag 'kbuild-v5.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull more Kbuild updates from Masahiro Yamada:
- raise minimum supported binutils version to 2.23
- remove old CONFIG_AS_* macros that we know binutils >= 2.23 supports
- move remaining CONFIG_AS_* tests to Kconfig from Makefile
- enable -Wtautological-compare warnings to catch more issues
- do not support GCC plugins for GCC <= 4.7
- fix various breakages of 'make xconfig'
- include the linker version used for linking the kernel into
LINUX_COMPILER, which is used for the banner, and also exposed to
/proc/version
- link lib-y objects to vmlinux forcibly when CONFIG_MODULES=y, which
allows us to remove the lib-ksyms.o workaround, and to solve the last
known issue of the LLVM linker
- add dummy tools in scripts/dummy-tools/ to enable all compiler tests
in Kconfig, which will be useful for distro maintainers
- support the single switch, LLVM=1 to use Clang and all LLVM utilities
instead of GCC and Binutils.
- support LLVM_IAS=1 to enable the integrated assembler, which is still
experimental
* tag 'kbuild-v5.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (36 commits)
kbuild: fix comment about missing include guard detection
kbuild: support LLVM=1 to switch the default tools to Clang/LLVM
kbuild: replace AS=clang with LLVM_IAS=1
kbuild: add dummy toolchains to enable all cc-option etc. in Kconfig
kbuild: link lib-y objects to vmlinux forcibly when CONFIG_MODULES=y
MIPS: fw: arc: add __weak to prom_meminit and prom_free_prom_memory
kbuild: remove -I$(srctree)/tools/include from scripts/Makefile
kbuild: do not pass $(KBUILD_CFLAGS) to scripts/mkcompile_h
Documentation/llvm: fix the name of llvm-size
kbuild: mkcompile_h: Include $LD version in /proc/version
kconfig: qconf: Fix a few alignment issues
kconfig: qconf: remove some old bogus TODOs
kconfig: qconf: fix support for the split view mode
kconfig: qconf: fix the content of the main widget
kconfig: qconf: Change title for the item window
kconfig: qconf: clean deprecated warnings
gcc-plugins: drop support for GCC <= 4.7
kbuild: Enable -Wtautological-compare
x86: update AS_* macros to binutils >=2.23, supporting ADX and AVX2
crypto: x86 - clean up poly1305-x86_64-cryptogams.S by 'make clean'
...
When oops happens with panic_on_oops unset, the oops
thread is killed by die() and system continues to run.
In such case, guest should not report crash register
data to host since system still runs. Check panic_on_oops
and return directly in hyperv_report_panic() when the function
is called in the die() and panic_on_oops is unset. Fix it.
Fixes: 7ed4325a44 ("Drivers: hv: vmbus: Make panic reporting to be more useful")
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20200406155331.2105-7-Tianyu.Lan@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
We want to notify Hyper-V when a Linux guest VM crash occurs, so
there is a record of the crash even when kdump is enabled. But
crash_kexec_post_notifiers defaults to "false", so the kdump kernel
runs before the notifiers and Hyper-V never gets notified. Fix this by
always setting crash_kexec_post_notifiers to be true for Hyper-V VMs.
Fixes: 81b18bce48 ("Drivers: HV: Send one page worth of kmsg dump over Hyper-V during panic")
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
Link: https://lore.kernel.org/r/20200406155331.2105-5-Tianyu.Lan@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Two types of #AC can be generated in Intel CPUs:
1. legacy alignment check #AC
2. split lock #AC
Reflect #AC back into the guest if the guest has legacy alignment checks
enabled or if split lock detection is disabled.
If the #AC is not a legacy one and split lock detection is enabled, then
invoke handle_guest_split_lock() which will either warn and disable split
lock detection for this task or force SIGBUS on it.
[ tglx: Switch it to handle_guest_split_lock() and rename the misnamed
helper function. ]
Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Link: https://lkml.kernel.org/r/20200410115517.176308876@linutronix.de
Without at least minimal handling for split lock detection induced #AC,
VMX will just run into the same problem as the VMWare hypervisor, which
was reported by Kenneth.
It will inject the #AC blindly into the guest whether the guest is
prepared or not.
Provide a function for guest mode which acts depending on the host
SLD mode. If mode == sld_warn, treat it like user space, i.e. emit a
warning, disable SLD and mark the task accordingly. Otherwise force
SIGBUS.
[ bp: Add a !CPU_SUP_INTEL stub for handle_guest_split_lock(). ]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Link: https://lkml.kernel.org/r/20200410115516.978037132@linutronix.de
Link: https://lkml.kernel.org/r/20200402123258.895628824@linutronix.de
Merge yet more updates from Andrew Morton:
- Almost all of the rest of MM (memcg, slab-generic, slab, pagealloc,
gup, hugetlb, pagemap, memremap)
- Various other things (hfs, ocfs2, kmod, misc, seqfile)
* akpm: (34 commits)
ipc/util.c: sysvipc_find_ipc() should increase position index
kernel/gcov/fs.c: gcov_seq_next() should increase position index
fs/seq_file.c: seq_read(): add info message about buggy .next functions
drivers/dma/tegra20-apb-dma.c: fix platform_get_irq.cocci warnings
change email address for Pali Rohár
selftests: kmod: test disabling module autoloading
selftests: kmod: fix handling test numbers above 9
docs: admin-guide: document the kernel.modprobe sysctl
fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn_once()
kmod: make request_module() return an error when autoloading is disabled
mm/memremap: set caching mode for PCI P2PDMA memory to WC
mm/memory_hotplug: add pgprot_t to mhp_params
powerpc/mm: thread pgprot_t through create_section_mapping()
x86/mm: introduce __set_memory_prot()
x86/mm: thread pgprot_t through init_memory_mapping()
mm/memory_hotplug: rename mhp_restrictions to mhp_params
mm/memory_hotplug: drop the flags field from struct mhp_restrictions
mm/special: create generic fallbacks for pte_special() and pte_mkspecial()
mm/vma: introduce VM_ACCESS_FLAGS
mm/vma: define a default value for VM_DATA_DEFAULT_FLAGS
...
