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2404269bc4
This reverts commit 73ac5d6a2b.
The work pending loop can call set_fs after addr_limit_user_check
removed the _TIF_FSCHECK flag. This may happen at anytime based on how
ARM handles alignment exceptions. It leads to an infinite loop condition.
After discussion, it has been agreed that the generic approach is not
tailored to the ARM architecture and any fix might not be complete. This
patch will be replaced by an architecture specific implementation. The
work flag approach will be kept for other architectures.
Reported-by: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Thomas Garnier <thgarnie@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Pratyush Anand <panand@redhat.com>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: Will Drewry <wad@chromium.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: David Howells <dhowells@redhat.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-api@vger.kernel.org
Cc: Yonghong Song <yhs@fb.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1504798247-48833-3-git-send-email-keescook@chromium.org
174 lines
5.2 KiB
C
174 lines
5.2 KiB
C
/*
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* arch/arm/include/asm/thread_info.h
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*
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* Copyright (C) 2002 Russell King.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_THREAD_INFO_H
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#define __ASM_ARM_THREAD_INFO_H
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#ifdef __KERNEL__
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#include <linux/compiler.h>
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#include <asm/fpstate.h>
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#include <asm/page.h>
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#define THREAD_SIZE_ORDER 1
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#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
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#define THREAD_START_SP (THREAD_SIZE - 8)
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#ifndef __ASSEMBLY__
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struct task_struct;
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#include <asm/types.h>
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typedef unsigned long mm_segment_t;
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struct cpu_context_save {
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__u32 r4;
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__u32 r5;
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__u32 r6;
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__u32 r7;
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__u32 r8;
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__u32 r9;
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__u32 sl;
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__u32 fp;
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__u32 sp;
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__u32 pc;
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__u32 extra[2]; /* Xscale 'acc' register, etc */
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};
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/*
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* low level task data that entry.S needs immediate access to.
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* __switch_to() assumes cpu_context follows immediately after cpu_domain.
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*/
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struct thread_info {
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unsigned long flags; /* low level flags */
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int preempt_count; /* 0 => preemptable, <0 => bug */
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mm_segment_t addr_limit; /* address limit */
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struct task_struct *task; /* main task structure */
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__u32 cpu; /* cpu */
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__u32 cpu_domain; /* cpu domain */
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struct cpu_context_save cpu_context; /* cpu context */
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__u32 syscall; /* syscall number */
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__u8 used_cp[16]; /* thread used copro */
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unsigned long tp_value[2]; /* TLS registers */
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#ifdef CONFIG_CRUNCH
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struct crunch_state crunchstate;
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#endif
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union fp_state fpstate __attribute__((aligned(8)));
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union vfp_state vfpstate;
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#ifdef CONFIG_ARM_THUMBEE
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unsigned long thumbee_state; /* ThumbEE Handler Base register */
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#endif
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};
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task = &tsk, \
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.flags = 0, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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.addr_limit = KERNEL_DS, \
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}
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#define init_thread_info (init_thread_union.thread_info)
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#define init_stack (init_thread_union.stack)
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/*
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* how to get the current stack pointer in C
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*/
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register unsigned long current_stack_pointer asm ("sp");
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/*
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* how to get the thread information struct from C
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*/
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static inline struct thread_info *current_thread_info(void) __attribute_const__;
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static inline struct thread_info *current_thread_info(void)
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{
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return (struct thread_info *)
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(current_stack_pointer & ~(THREAD_SIZE - 1));
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}
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#define thread_saved_pc(tsk) \
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((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
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#define thread_saved_sp(tsk) \
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((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
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#ifndef CONFIG_THUMB2_KERNEL
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#define thread_saved_fp(tsk) \
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((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
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#else
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#define thread_saved_fp(tsk) \
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((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
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#endif
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extern void crunch_task_disable(struct thread_info *);
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extern void crunch_task_copy(struct thread_info *, void *);
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extern void crunch_task_restore(struct thread_info *, void *);
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extern void crunch_task_release(struct thread_info *);
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extern void iwmmxt_task_disable(struct thread_info *);
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extern void iwmmxt_task_copy(struct thread_info *, void *);
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extern void iwmmxt_task_restore(struct thread_info *, void *);
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extern void iwmmxt_task_release(struct thread_info *);
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extern void iwmmxt_task_switch(struct thread_info *);
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extern void vfp_sync_hwstate(struct thread_info *);
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extern void vfp_flush_hwstate(struct thread_info *);
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struct user_vfp;
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struct user_vfp_exc;
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extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
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struct user_vfp_exc __user *);
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extern int vfp_restore_user_hwstate(struct user_vfp __user *,
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struct user_vfp_exc __user *);
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#endif
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/*
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* thread information flags:
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* TIF_USEDFPU - FPU was used by this task this quantum (SMP)
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* TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
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*/
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#define TIF_SIGPENDING 0 /* signal pending */
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#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
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#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
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#define TIF_UPROBE 3 /* breakpointed or singlestepping */
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#define TIF_SYSCALL_TRACE 4 /* syscall trace active */
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#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
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#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
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#define TIF_SECCOMP 7 /* seccomp syscall filtering active */
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#define TIF_NOHZ 12 /* in adaptive nohz mode */
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#define TIF_USING_IWMMXT 17
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#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
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#define TIF_RESTORE_SIGMASK 20
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#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
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#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
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#define _TIF_UPROBE (1 << TIF_UPROBE)
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#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
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#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
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#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
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#define _TIF_SECCOMP (1 << TIF_SECCOMP)
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#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
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/* Checks for any syscall work in entry-common.S */
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#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
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_TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
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/*
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* Change these and you break ASM code in entry-common.S
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*/
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#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
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_TIF_NOTIFY_RESUME | _TIF_UPROBE)
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#endif /* __KERNEL__ */
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#endif /* __ASM_ARM_THREAD_INFO_H */
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