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Misc fixes:

Browse source 
- Fix more generic entry code ABI fallout
  - Fix debug register handling bugs
  - Fix vmalloc mappings on 32-bit kernels
  - Fix kprobes instrumentation output on 32-bit kernels
  - Fix over-eager WARN_ON_ONCE() on !SMAP hardware
  - Fix NUMA debugging
  - Fix Clang related crash on !RETPOLINE kernels
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-urgent-2020-09-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:

 - more generic entry code ABI fallout

 - debug register handling bugfixes

 - fix vmalloc mappings on 32-bit kernels

 - kprobes instrumentation output fix on 32-bit kernels

 - fix over-eager WARN_ON_ONCE() on !SMAP hardware

 - NUMA debugging fix

 - fix Clang related crash on !RETPOLINE kernels

* tag 'x86-urgent-2020-09-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/entry: Unbreak 32bit fast syscall
  x86/debug: Allow a single level of #DB recursion
  x86/entry: Fix AC assertion
  tracing/kprobes, x86/ptrace: Fix regs argument order for i386
  x86, fakenuma: Fix invalid starting node ID
  x86/mm/32: Bring back vmalloc faulting on x86_32
  x86/cmdline: Disable jump tables for cmdline.c
This commit is contained in:
Linus Torvalds 2020-09-06 10:28:00 -07:00
commit 015b3155c4
9 changed files with 213 additions and 63 deletions
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51
include/linux/entry-common.h
View file

@ -110,15 +110,30 @@ static inline __must_check int arch_syscall_enter_tracehook(struct pt_regs *regs
#endif
/**
* syscall_enter_from_user_mode - Check and handle work before invoking
* a syscall
* syscall_enter_from_user_mode_prepare - Establish state and enable interrupts
* @regs: Pointer to currents pt_regs
*
* Invoked from architecture specific syscall entry code with interrupts
* disabled. The calling code has to be non-instrumentable. When the
* function returns all state is correct, interrupts are enabled and the
* subsequent functions can be instrumented.
*
* This handles lockdep, RCU (context tracking) and tracing state.
*
* This is invoked when there is extra architecture specific functionality
* to be done between establishing state and handling user mode entry work.
*/
void syscall_enter_from_user_mode_prepare(struct pt_regs *regs);
/**
* syscall_enter_from_user_mode_work - Check and handle work before invoking
* a syscall
* @regs: Pointer to currents pt_regs
* @syscall: The syscall number
*
* Invoked from architecture specific syscall entry code with interrupts
* disabled. The calling code has to be non-instrumentable. When the
* function returns all state is correct and the subsequent functions can be
* instrumented.
* enabled after invoking syscall_enter_from_user_mode_prepare() and extra
* architecture specific work.
*
* Returns: The original or a modified syscall number
*
@ -127,12 +142,30 @@ static inline __must_check int arch_syscall_enter_tracehook(struct pt_regs *regs
* syscall_set_return_value() first. If neither of those are called and -1
* is returned, then the syscall will fail with ENOSYS.
*
* The following functionality is handled here:
* It handles the following work items:
*
* 1) Establish state (lockdep, RCU (context tracking), tracing)
* 2) TIF flag dependent invocations of arch_syscall_enter_tracehook(),
* 1) TIF flag dependent invocations of arch_syscall_enter_tracehook(),
* __secure_computing(), trace_sys_enter()
* 3) Invocation of audit_syscall_entry()
* 2) Invocation of audit_syscall_entry()
*/
long syscall_enter_from_user_mode_work(struct pt_regs *regs, long syscall);
/**
* syscall_enter_from_user_mode - Establish state and check and handle work
* before invoking a syscall
* @regs: Pointer to currents pt_regs
* @syscall: The syscall number
*
* Invoked from architecture specific syscall entry code with interrupts
* disabled. The calling code has to be non-instrumentable. When the
* function returns all state is correct, interrupts are enabled and the
* subsequent functions can be instrumented.
*
* This is combination of syscall_enter_from_user_mode_prepare() and
* syscall_enter_from_user_mode_work().
*
* Returns: The original or a modified syscall number. See
* syscall_enter_from_user_mode_work() for further explanation.
*/
long syscall_enter_from_user_mode(struct pt_regs *regs, long syscall);