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d39bd00dea
populate_seccomp_data is expensive: it works by inspecting task_pt_regs and various other bits to piece together all the information, and it's does so in multiple partially redundant steps. Arch-specific code in the syscall entry path can do much better. Admittedly this adds a bit of additional room for error, but the speedup should be worth it. Signed-off-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Kees Cook <keescook@chromium.org>
99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
#ifndef _LINUX_SECCOMP_H
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#define _LINUX_SECCOMP_H
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#include <uapi/linux/seccomp.h>
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#define SECCOMP_FILTER_FLAG_MASK (SECCOMP_FILTER_FLAG_TSYNC)
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#ifdef CONFIG_SECCOMP
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#include <linux/thread_info.h>
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#include <asm/seccomp.h>
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struct seccomp_filter;
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/**
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* struct seccomp - the state of a seccomp'ed process
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*
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* @mode: indicates one of the valid values above for controlled
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* system calls available to a process.
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* @filter: must always point to a valid seccomp-filter or NULL as it is
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* accessed without locking during system call entry.
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*
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* @filter must only be accessed from the context of current as there
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* is no read locking.
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*/
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struct seccomp {
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int mode;
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struct seccomp_filter *filter;
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};
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#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
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extern int __secure_computing(void);
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static inline int secure_computing(void)
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{
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if (unlikely(test_thread_flag(TIF_SECCOMP)))
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return __secure_computing();
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return 0;
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}
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#define SECCOMP_PHASE1_OK 0
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#define SECCOMP_PHASE1_SKIP 1
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extern u32 seccomp_phase1(struct seccomp_data *sd);
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int seccomp_phase2(u32 phase1_result);
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#else
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extern void secure_computing_strict(int this_syscall);
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#endif
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extern long prctl_get_seccomp(void);
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extern long prctl_set_seccomp(unsigned long, char __user *);
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static inline int seccomp_mode(struct seccomp *s)
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{
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return s->mode;
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}
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#else /* CONFIG_SECCOMP */
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#include <linux/errno.h>
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struct seccomp { };
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struct seccomp_filter { };
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#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
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static inline int secure_computing(void) { return 0; }
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#else
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static inline void secure_computing_strict(int this_syscall) { return; }
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#endif
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static inline long prctl_get_seccomp(void)
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{
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return -EINVAL;
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}
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static inline long prctl_set_seccomp(unsigned long arg2, char __user *arg3)
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{
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return -EINVAL;
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}
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static inline int seccomp_mode(struct seccomp *s)
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{
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return 0;
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}
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#endif /* CONFIG_SECCOMP */
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#ifdef CONFIG_SECCOMP_FILTER
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extern void put_seccomp_filter(struct task_struct *tsk);
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extern void get_seccomp_filter(struct task_struct *tsk);
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#else /* CONFIG_SECCOMP_FILTER */
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static inline void put_seccomp_filter(struct task_struct *tsk)
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{
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return;
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}
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static inline void get_seccomp_filter(struct task_struct *tsk)
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{
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return;
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}
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#endif /* CONFIG_SECCOMP_FILTER */
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#endif /* _LINUX_SECCOMP_H */
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