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A set of fixes for X86:

Browse Source 
- Prevent sending the wrong signal when protection keys are enabled and
    the kernel handles a fault in the vsyscall emulation.
 
  - Invoke early_reserve_memory() before invoking e820_memory_setup() which
    is required to make the Xen dom0 e820 hooks work correctly.
 
  - Use the correct data type for the SETZ operand in the EMQCMDS
    instruction wrapper.
 
  - Prevent undefined behaviour to the potential unaligned accesss in the
    instroction decoder library.
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Merge tag 'x86-urgent-2021-09-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Thomas Gleixner:
 "A set of fixes for X86:

   - Prevent sending the wrong signal when protection keys are enabled
     and the kernel handles a fault in the vsyscall emulation.

   - Invoke early_reserve_memory() before invoking e820_memory_setup()
     which is required to make the Xen dom0 e820 hooks work correctly.

   - Use the correct data type for the SETZ operand in the EMQCMDS
     instruction wrapper.

   - Prevent undefined behaviour to the potential unaligned accesss in
     the instruction decoder library"

* tag 'x86-urgent-2021-09-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/insn, tools/x86: Fix undefined behavior due to potential unaligned accesses
  x86/asm: Fix SETZ size enqcmds() build failure
  x86/setup: Call early_reserve_memory() earlier
  x86/fault: Fix wrong signal when vsyscall fails with pkey
This commit is contained in:
Linus Torvalds 2021-09-26 10:09:20 -07:00
commit 5bb7b2107f
7 changed files with 39 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/pkeys.h
View File

@ -2,8 +2,6 @@
#ifndef _ASM_X86_PKEYS_H
#define _ASM_X86_PKEYS_H
#define ARCH_DEFAULT_PKEY 0
/*
* If more than 16 keys are ever supported, a thorough audit
* will be necessary to ensure that the types that store key

2
arch/x86/include/asm/special_insns.h
View File

@ -275,7 +275,7 @@ static inline int enqcmds(void __iomem *dst, const void *src)
{
const struct { char _[64]; } *__src = src;
struct { char _[64]; } __iomem *__dst = dst;
int zf;
bool zf;
/*
* ENQCMDS %(rdx), rax

26
arch/x86/kernel/setup.c
View File

@ -830,6 +830,20 @@ void __init setup_arch(char **cmdline_p)
x86_init.oem.arch_setup();
/*
* Do some memory reservations *before* memory is added to memblock, so
* memblock allocations won't overwrite it.
*
* After this point, everything still needed from the boot loader or
* firmware or kernel text should be early reserved or marked not RAM in
* e820. All other memory is free game.
*
* This call needs to happen before e820__memory_setup() which calls the
* xen_memory_setup() on Xen dom0 which relies on the fact that those
* early reservations have happened already.
*/
early_reserve_memory();
iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
e820__memory_setup();
parse_setup_data();
@ -876,18 +890,6 @@ void __init setup_arch(char **cmdline_p)
parse_early_param();
/*
* Do some memory reservations *before* memory is added to
* memblock, so memblock allocations won't overwrite it.
* Do it after early param, so we could get (unlikely) panic from
* serial.
*
* After this point everything still needed from the boot loader or
* firmware or kernel text should be early reserved or marked not
* RAM in e820. All other memory is free game.
*/
early_reserve_memory();
#ifdef CONFIG_MEMORY_HOTPLUG
/*
* Memory used by the kernel cannot be hot-removed because Linux

4
arch/x86/lib/insn.c
View File

@ -37,10 +37,10 @@
((insn)->next_byte + sizeof(t) + n <= (insn)->end_kaddr)
#define __get_next(t, insn) \
({ t r = *(t*)insn->next_byte; insn->next_byte += sizeof(t); leXX_to_cpu(t, r); })
({ t r; memcpy(&r, insn->next_byte, sizeof(t)); insn->next_byte += sizeof(t); leXX_to_cpu(t, r); })
#define __peek_nbyte_next(t, insn, n) \
({ t r = *(t*)((insn)->next_byte + n); leXX_to_cpu(t, r); })
({ t r; memcpy(&r, (insn)->next_byte + n, sizeof(t)); leXX_to_cpu(t, r); })
#define get_next(t, insn) \
({ if (unlikely(!validate_next(t, insn, 0))) goto err_out; __get_next(t, insn); })

22
arch/x86/mm/fault.c
View File

@ -710,7 +710,8 @@ oops:
static noinline void
kernelmode_fixup_or_oops(struct pt_regs *regs, unsigned long error_code,
unsigned long address, int signal, int si_code)
unsigned long address, int signal, int si_code,
u32 pkey)
{
WARN_ON_ONCE(user_mode(regs));
@ -735,9 +736,13 @@ kernelmode_fixup_or_oops(struct pt_regs *regs, unsigned long error_code,
set_signal_archinfo(address, error_code);
if (si_code == SEGV_PKUERR) {
force_sig_pkuerr((void __user *)address, pkey);
} else {
/* XXX: hwpoison faults will set the wrong code. */
force_sig_fault(signal, si_code, (void __user *)address);
}
}
/*
* Barring that, we can do the fixup and be happy.
@ -798,7 +803,8 @@ __bad_area_nosemaphore(struct pt_regs *regs, unsigned long error_code,
struct task_struct *tsk = current;
if (!user_mode(regs)) {
kernelmode_fixup_or_oops(regs, error_code, address, pkey, si_code);
kernelmode_fixup_or_oops(regs, error_code, address,
SIGSEGV, si_code, pkey);
return;
}
@ -930,7 +936,8 @@ do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address,
{
/* Kernel mode? Handle exceptions or die: */
if (!user_mode(regs)) {
kernelmode_fixup_or_oops(regs, error_code, address, SIGBUS, BUS_ADRERR);
kernelmode_fixup_or_oops(regs, error_code, address,
SIGBUS, BUS_ADRERR, ARCH_DEFAULT_PKEY);
return;
}
@ -1396,7 +1403,8 @@ good_area:
*/
if (!user_mode(regs))
kernelmode_fixup_or_oops(regs, error_code, address,
SIGBUS, BUS_ADRERR);
SIGBUS, BUS_ADRERR,
ARCH_DEFAULT_PKEY);
return;
}
@ -1416,7 +1424,8 @@ good_area:
return;
if (fatal_signal_pending(current) && !user_mode(regs)) {
kernelmode_fixup_or_oops(regs, error_code, address, 0, 0);
kernelmode_fixup_or_oops(regs, error_code, address,
0, 0, ARCH_DEFAULT_PKEY);
return;
}
@ -1424,7 +1433,8 @@ good_area:
/* Kernel mode? Handle exceptions or die: */
if (!user_mode(regs)) {
kernelmode_fixup_or_oops(regs, error_code, address,
SIGSEGV, SEGV_MAPERR);
SIGSEGV, SEGV_MAPERR,
ARCH_DEFAULT_PKEY);
return;
}

2
include/linux/pkeys.h
View File

@ -4,6 +4,8 @@
#include <linux/mm.h>
#define ARCH_DEFAULT_PKEY 0
#ifdef CONFIG_ARCH_HAS_PKEYS
#include <asm/pkeys.h>
#else /* ! CONFIG_ARCH_HAS_PKEYS */

4
tools/arch/x86/lib/insn.c
View File

@ -37,10 +37,10 @@
((insn)->next_byte + sizeof(t) + n <= (insn)->end_kaddr)
#define __get_next(t, insn) \
({ t r = *(t*)insn->next_byte; insn->next_byte += sizeof(t); leXX_to_cpu(t, r); })
({ t r; memcpy(&r, insn->next_byte, sizeof(t)); insn->next_byte += sizeof(t); leXX_to_cpu(t, r); })
#define __peek_nbyte_next(t, insn, n) \
({ t r = *(t*)((insn)->next_byte + n); leXX_to_cpu(t, r); })
({ t r; memcpy(&r, (insn)->next_byte + n, sizeof(t)); leXX_to_cpu(t, r); })
#define get_next(t, insn) \
({ if (unlikely(!validate_next(t, insn, 0))) goto err_out; __get_next(t, insn); })