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d3ccc97815
Usually sigset_t is exactly 8B which is a "trivial" size and does not warrant using __copy_from_user(). Use __get_user() directly in anticipation of future work to remove the trivial size optimizations from __copy_from_user(). The ppc32 implementation of get_sigset_t() previously called copy_from_user() which, unlike __copy_from_user(), calls access_ok(). Replacing this w/ __get_user() (no access_ok()) is fine here since both callsites in signal_32.c are preceded by an earlier access_ok(). Signed-off-by: Christopher M. Riedl <cmr@codefail.de> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210227011259.11992-11-cmr@codefail.de
186 lines
5.7 KiB
C
186 lines
5.7 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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void __user *get_sigframe(struct ksignal *ksig, struct task_struct *tsk,
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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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static inline int __get_user_sigset(sigset_t *dst, const sigset_t __user *src)
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{
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BUILD_BUG_ON(sizeof(sigset_t) != sizeof(u64));
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return __get_user(dst->sig[0], (u64 __user *)&src->sig[0]);
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}
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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_ckvsx_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_ckvsx_from_user(struct task_struct *task,
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void __user *from);
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unsigned long copy_fpr_to_user(void __user *to, struct task_struct *task);
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unsigned long copy_ckfpr_to_user(void __user *to, struct task_struct *task);
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unsigned long copy_fpr_from_user(struct task_struct *task, void __user *from);
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unsigned long copy_ckfpr_from_user(struct task_struct *task, void __user *from);
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#define unsafe_copy_fpr_to_user(to, task, label) do { \
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struct task_struct *__t = task; \
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u64 __user *buf = (u64 __user *)to; \
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int i; \
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\
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for (i = 0; i < ELF_NFPREG - 1 ; i++) \
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unsafe_put_user(__t->thread.TS_FPR(i), &buf[i], label); \
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unsafe_put_user(__t->thread.fp_state.fpscr, &buf[i], label); \
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} while (0)
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#define unsafe_copy_vsx_to_user(to, task, label) do { \
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struct task_struct *__t = task; \
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u64 __user *buf = (u64 __user *)to; \
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int i; \
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\
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for (i = 0; i < ELF_NVSRHALFREG ; i++) \
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unsafe_put_user(__t->thread.fp_state.fpr[i][TS_VSRLOWOFFSET], \
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&buf[i], label);\
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} while (0)
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#define unsafe_copy_fpr_from_user(task, from, label) do { \
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struct task_struct *__t = task; \
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u64 __user *buf = (u64 __user *)from; \
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int i; \
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\
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for (i = 0; i < ELF_NFPREG - 1; i++) \
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unsafe_get_user(__t->thread.TS_FPR(i), &buf[i], label); \
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unsafe_get_user(__t->thread.fp_state.fpscr, &buf[i], label); \
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} while (0)
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#define unsafe_copy_vsx_from_user(task, from, label) do { \
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struct task_struct *__t = task; \
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u64 __user *buf = (u64 __user *)from; \
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int i; \
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\
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for (i = 0; i < ELF_NVSRHALFREG ; i++) \
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unsafe_get_user(__t->thread.fp_state.fpr[i][TS_VSRLOWOFFSET], \
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&buf[i], label); \
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} while (0)
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#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
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#define unsafe_copy_ckfpr_to_user(to, task, label) do { \
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struct task_struct *__t = task; \
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u64 __user *buf = (u64 __user *)to; \
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int i; \
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\
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for (i = 0; i < ELF_NFPREG - 1 ; i++) \
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unsafe_put_user(__t->thread.TS_CKFPR(i), &buf[i], label);\
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unsafe_put_user(__t->thread.ckfp_state.fpscr, &buf[i], label); \
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} while (0)
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#define unsafe_copy_ckvsx_to_user(to, task, label) do { \
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struct task_struct *__t = task; \
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u64 __user *buf = (u64 __user *)to; \
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int i; \
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\
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for (i = 0; i < ELF_NVSRHALFREG ; i++) \
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unsafe_put_user(__t->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET], \
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&buf[i], label);\
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} while (0)
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#endif
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#elif defined(CONFIG_PPC_FPU_REGS)
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#define unsafe_copy_fpr_to_user(to, task, label) \
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unsafe_copy_to_user(to, (task)->thread.fp_state.fpr, \
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ELF_NFPREG * sizeof(double), label)
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#define unsafe_copy_fpr_from_user(task, from, label) \
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unsafe_copy_from_user((task)->thread.fp_state.fpr, from, \
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ELF_NFPREG * sizeof(double), label)
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static inline unsigned long
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copy_fpr_to_user(void __user *to, struct task_struct *task)
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{
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return __copy_to_user(to, task->thread.fp_state.fpr,
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ELF_NFPREG * sizeof(double));
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}
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static inline unsigned long
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copy_fpr_from_user(struct task_struct *task, void __user *from)
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{
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return __copy_from_user(task->thread.fp_state.fpr, from,
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ELF_NFPREG * sizeof(double));
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}
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#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
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#define unsafe_copy_ckfpr_to_user(to, task, label) \
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unsafe_copy_to_user(to, (task)->thread.ckfp_state.fpr, \
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ELF_NFPREG * sizeof(double), label)
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inline unsigned long copy_ckfpr_to_user(void __user *to, struct task_struct *task)
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{
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return __copy_to_user(to, task->thread.ckfp_state.fpr,
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ELF_NFPREG * sizeof(double));
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}
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static inline unsigned long
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copy_ckfpr_from_user(struct task_struct *task, void __user *from)
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{
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return __copy_from_user(task->thread.ckfp_state.fpr, from,
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ELF_NFPREG * sizeof(double));
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}
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#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
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#else
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#define unsafe_copy_fpr_to_user(to, task, label) do { } while (0)
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#define unsafe_copy_fpr_from_user(task, from, label) do { } while (0)
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static inline unsigned long
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copy_fpr_to_user(void __user *to, struct task_struct *task)
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{
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return 0;
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}
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static inline unsigned long
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copy_fpr_from_user(struct task_struct *task, void __user *from)
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{
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return 0;
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}
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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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extern long sys_rt_sigreturn(void);
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extern long sys_sigreturn(void);
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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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void signal_fault(struct task_struct *tsk, struct pt_regs *regs,
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const char *where, void __user *ptr);
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#endif /* _POWERPC_ARCH_SIGNAL_H */
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