d11994314b
Much of the signal code takes a pt_regs on which it operates. Over time the signal code has needed to know more about the thread than what pt_regs can supply, this information is obtained as needed by using 'current'. This approach is not strictly incorrect however it does mean that there is now a hard requirement that the pt_regs being passed around does belong to current, this is never checked. A safer approach is for the majority of the signal functions to take a task_struct from which they can obtain pt_regs and any other information they need. The caveat that the task_struct they are passed must be current doesn't go away but can more easily be checked for. Functions called from outside powerpc signal code are passed a pt_regs and they can confirm that the pt_regs is that of current and pass current to other functions, furthurmore, powerpc signal functions can check that the task_struct they are passed is the same as current avoiding possible corruption of current (or the task they are passed) if this assertion ever fails. CC: paulus@samba.org Signed-off-by: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/*
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* Copyright (c) 2007 Benjamin Herrenschmidt, IBM Corporation
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* Extracted from signal_32.c and signal_64.c
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file README.legal in the main directory of
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* this archive for more details.
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*/
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#ifndef _POWERPC_ARCH_SIGNAL_H
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#define _POWERPC_ARCH_SIGNAL_H
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extern void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags);
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extern void __user *get_sigframe(struct ksignal *ksig, unsigned long sp,
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size_t frame_size, int is_32);
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extern int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
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struct task_struct *tsk);
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extern int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
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struct task_struct *tsk);
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extern unsigned long copy_fpr_to_user(void __user *to,
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struct task_struct *task);
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extern unsigned long copy_transact_fpr_to_user(void __user *to,
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struct task_struct *task);
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extern unsigned long copy_fpr_from_user(struct task_struct *task,
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void __user *from);
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extern unsigned long copy_transact_fpr_from_user(struct task_struct *task,
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void __user *from);
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extern unsigned long get_tm_stackpointer(struct task_struct *tsk);
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#ifdef CONFIG_VSX
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extern unsigned long copy_vsx_to_user(void __user *to,
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struct task_struct *task);
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extern unsigned long copy_transact_vsx_to_user(void __user *to,
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struct task_struct *task);
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extern unsigned long copy_vsx_from_user(struct task_struct *task,
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void __user *from);
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extern unsigned long copy_transact_vsx_from_user(struct task_struct *task,
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void __user *from);
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#endif
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#ifdef CONFIG_PPC64
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extern int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
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struct task_struct *tsk);
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#else /* CONFIG_PPC64 */
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static inline int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
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struct task_struct *tsk)
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{
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return -EFAULT;
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}
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#endif /* !defined(CONFIG_PPC64) */
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#endif /* _POWERPC_ARCH_SIGNAL_H */
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