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  1. 31 5月, 2019 6 次提交
    • T
      x86/mce: Fix machine_check_poll() tests for error types · 3d036cba
      由 Tony Luck 提交于 
      [ Upstream commit f19501aa07f18268ab14f458b51c1c6b7f72a134 ]

There has been a lurking "TBD" in the machine check poll routine ever
since it was first split out from the machine check handler. The
potential issue is that the poll routine may have just begun a read from
the STATUS register in a machine check bank when the hardware logs an
error in that bank and signals a machine check.

That race used to be pretty small back when machine checks were
broadcast, but the addition of local machine check means that the poll
code could continue running and clear the error from the bank before the
local machine check handler on another CPU gets around to reading it.

Fix the code to be sure to only process errors that need to be processed
in the poll code, leaving other logged errors alone for the machine
check handler to find and process.

 [ bp: Massage a bit and flip the "== 0" check to the usual !(..) test. ]

Fixes: b79109c3 ("x86, mce: separate correct machine check poller and fatal exception handler")
Fixes: ed7290d0 ("x86, mce: implement new status bits")
Reported-by: NAshok Raj <ashok.raj@intel.com>
Signed-off-by: NTony Luck <tony.luck@intel.com>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Cc: Yazen Ghannam <Yazen.Ghannam@amd.com>
Link: https://lkml.kernel.org/r/20190312170938.GA23035@agluck-deskSigned-off-by: NSasha Levin <sashal@kernel.org>
      3d036cba
    • P
      x86/uaccess, signal: Fix AC=1 bloat · 4614b0bb
      由 Peter Zijlstra 提交于 
      [ Upstream commit 88e4718275c1bddca6f61f300688b4553dc8584b ]

Occasionally GCC is less agressive with inlining and the following is
observed:

  arch/x86/kernel/signal.o: warning: objtool: restore_sigcontext()+0x3cc: call to force_valid_ss.isra.5() with UACCESS enabled
  arch/x86/kernel/signal.o: warning: objtool: do_signal()+0x384: call to frame_uc_flags.isra.0() with UACCESS enabled

Cure this by moving this code out of the AC=1 region, since it really
isn't needed for the user access.
Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: NAndy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
      4614b0bb
    • B
      x86/microcode: Fix the ancient deprecated microcode loading method · a07de9b9
      由 Borislav Petkov 提交于 
      [ Upstream commit 24613a04ad1c0588c10f4b5403ca60a73d164051 ]

Commit

  2613f36e ("x86/microcode: Attempt late loading only when new microcode is present")

added the new define UCODE_NEW to denote that an update should happen
only when newer microcode (than installed on the system) has been found.

But it missed adjusting that for the old /dev/cpu/microcode loading
interface. Fix it.

Fixes: 2613f36e ("x86/microcode: Attempt late loading only when new microcode is present")
Signed-off-by: NBorislav Petkov <bp@suse.de>
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Jann Horn <jannh@google.com>
Link: https://lkml.kernel.org/r/20190405133010.24249-3-bp@alien8.deSigned-off-by: NSasha Levin <sashal@kernel.org>
      a07de9b9
    • T
      x86/irq/64: Limit IST stack overflow check to #DB stack · f843f848
      由 Thomas Gleixner 提交于 
      [ Upstream commit 7dbcf2b0b770eeb803a416ee8dcbef78e6389d40 ]

Commit

  37fe6a42 ("x86: Check stack overflow in detail")

added a broad check for the full exception stack area, i.e. it considers
the full exception stack area as valid.

That's wrong in two aspects:

 1) It does not check the individual areas one by one

 2) #DF, NMI and #MCE are not enabling interrupts which means that a
    regular device interrupt cannot happen in their context. In fact if a
    device interrupt hits one of those IST stacks that's a bug because some
    code path enabled interrupts while handling the exception.

Limit the check to the #DB stack and consider all other IST stacks as
'overflow' or invalid.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Mitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com>
Cc: Nicolai Stange <nstange@suse.de>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190414160143.682135110@linutronix.deSigned-off-by: NSasha Levin <sashal@kernel.org>
      f843f848
    • K
      x86/build: Move _etext to actual end of .text · 0fcb3cd5
      由 Kees Cook 提交于 
      [ Upstream commit 392bef709659abea614abfe53cf228e7a59876a4 ]

When building x86 with Clang LTO and CFI, CFI jump regions are
automatically added to the end of the .text section late in linking. As a
result, the _etext position was being labelled before the appended jump
regions, causing confusion about where the boundaries of the executable
region actually are in the running kernel, and broke at least the fault
injection code. This moves the _etext mark to outside (and immediately
after) the .text area, as it already the case on other architectures
(e.g. arm64, arm).
Reported-and-tested-by: NSami Tolvanen <samitolvanen@google.com>
Signed-off-by: NKees Cook <keescook@chromium.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20190423183827.GA4012@beastSigned-off-by: NIngo Molnar <mingo@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
      0fcb3cd5
    • N
      x86/modules: Avoid breaking W^X while loading modules · 8715ce03
      由 Nadav Amit 提交于 
      [ Upstream commit f2c65fb3221adc6b73b0549fc7ba892022db9797 ]

When modules and BPF filters are loaded, there is a time window in
which some memory is both writable and executable. An attacker that has
already found another vulnerability (e.g., a dangling pointer) might be
able to exploit this behavior to overwrite kernel code. Prevent having
writable executable PTEs in this stage.

In addition, avoiding having W+X mappings can also slightly simplify the
patching of modules code on initialization (e.g., by alternatives and
static-key), as would be done in the next patch. This was actually the
main motivation for this patch.

To avoid having W+X mappings, set them initially as RW (NX) and after
they are set as RO set them as X as well. Setting them as executable is
done as a separate step to avoid one core in which the old PTE is cached
(hence writable), and another which sees the updated PTE (executable),
which would break the W^X protection.
Suggested-by: NThomas Gleixner <tglx@linutronix.de>
Suggested-by: NAndy Lutomirski <luto@amacapital.net>
Signed-off-by: NNadav Amit <namit@vmware.com>
Signed-off-by: NRick Edgecombe <rick.p.edgecombe@intel.com>
Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: <akpm@linux-foundation.org>
Cc: <ard.biesheuvel@linaro.org>
Cc: <deneen.t.dock@intel.com>
Cc: <kernel-hardening@lists.openwall.com>
Cc: <kristen@linux.intel.com>
Cc: <linux_dti@icloud.com>
Cc: <will.deacon@arm.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Rik van Riel <riel@surriel.com>
Link: https://lkml.kernel.org/r/20190426001143.4983-12-namit@vmware.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
      8715ce03
  3. 26 5月, 2019 1 次提交
  5. 22 5月, 2019 2 次提交
  7. 17 5月, 2019 3 次提交
  9. 15 5月, 2019 18 次提交
  11. 08 5月, 2019 1 次提交
  13. 02 5月, 2019 1 次提交
    • S
      x86/fpu: Don't export __kernel_fpu_{begin,end}() · d4ff57d0
      由 Sebastian Andrzej Siewior 提交于 
      commit 12209993e98c5fa1855c467f22a24e3d5b8be205 upstream.

There is one user of __kernel_fpu_begin() and before invoking it,
it invokes preempt_disable(). So it could invoke kernel_fpu_begin()
right away. The 32bit version of arch_efi_call_virt_setup() and
arch_efi_call_virt_teardown() does this already.

The comment above *kernel_fpu*() claims that before invoking
__kernel_fpu_begin() preemption should be disabled and that KVM is a
good example of doing it. Well, KVM doesn't do that since commit

  f775b13e ("x86,kvm: move qemu/guest FPU switching out to vcpu_run")

so it is not an example anymore.

With EFI gone as the last user of __kernel_fpu_{begin|end}(), both can
be made static and not exported anymore.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Reviewed-by: NRik van Riel <riel@surriel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Nicolai Stange <nstange@suse.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kvm ML <kvm@vger.kernel.org>
Cc: linux-efi <linux-efi@vger.kernel.org>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20181129150210.2k4mawt37ow6c2vq@linutronix.deSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      d4ff57d0
  15. 27 4月, 2019 3 次提交
  17. 20 4月, 2019 5 次提交