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https://github.com/checkpoint-restore/criu.git
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b65ba9a8d6
The munmap syscall must be executed from a process memory. The code can be injected in memory and then removed. But we can avoid all these actions, if the code will be in the blob and a process will be trapped on the exit from the munmap syscall. Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
119 lines
4.2 KiB
C
119 lines
4.2 KiB
C
#ifndef __CR_PARASITE_SYSCALL_H__
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#define __CR_PARASITE_SYSCALL_H__
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#define BUILTIN_SYSCALL_SIZE 8
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#include "pstree.h"
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struct parasite_dump_thread;
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struct parasite_dump_misc;
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struct parasite_drain_fd;
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struct vm_area_list;
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struct pstree_item;
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struct _CredsEntry;
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struct _CoreEntry;
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struct list_head;
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struct cr_fdset;
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struct fd_opts;
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struct pid;
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/* parasite control block */
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struct parasite_ctl {
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struct pid pid;
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void *remote_map;
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void *local_map;
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unsigned long map_length;
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/* thread leader data */
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bool daemonized;
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user_regs_struct_t regs_orig; /* original registers */
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k_rtsigset_t sig_blocked;
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void *rstack; /* thread leader stack*/
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struct rt_sigframe *sigframe;
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struct rt_sigframe *rsigframe; /* address in a parasite */
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void *r_thread_stack; /* stack for non-leader threads */
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unsigned long parasite_ip; /* service routine start ip */
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unsigned long syscall_ip; /* entry point of infection */
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u8 code_orig[BUILTIN_SYSCALL_SIZE];
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unsigned int *addr_cmd; /* addr for command */
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void *addr_args; /* address for arguments */
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unsigned long args_size;
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int tsock; /* transport socket for transfering fds */
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struct list_head pre_list;
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struct page_pipe *mem_pp;
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};
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extern int parasite_dump_sigacts_seized(struct parasite_ctl *ctl, struct cr_fdset *cr_fdset);
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extern int parasite_dump_itimers_seized(struct parasite_ctl *ctl, struct cr_fdset *cr_fdset);
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struct proc_posix_timers_stat;
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extern int parasite_dump_posix_timers_seized(struct proc_posix_timers_stat *proc_args, struct parasite_ctl *ctl, struct cr_fdset *cr_fdset);
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#define parasite_args(ctl, type) \
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({ \
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BUILD_BUG_ON(sizeof(type) > PARASITE_ARG_SIZE_MIN); \
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ctl->addr_args; \
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})
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extern void *parasite_args_s(struct parasite_ctl *ctl, int args_size);
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extern int parasite_send_fd(struct parasite_ctl *ctl, int fd);
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/*
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* Execute a command in parasite when it's in daemon mode.
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* The __-ed version is asyncronous (doesn't wait for ack).
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*/
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extern int parasite_execute_daemon(unsigned int cmd, struct parasite_ctl *ctl);
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extern int __parasite_execute_daemon(unsigned int cmd, struct parasite_ctl *ctl);
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extern int __parasite_wait_daemon_ack(unsigned int cmd,
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struct parasite_ctl *ctl);
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extern int parasite_dump_misc_seized(struct parasite_ctl *ctl, struct parasite_dump_misc *misc);
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extern int parasite_dump_creds(struct parasite_ctl *ctl, struct _CredsEntry *ce);
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extern int parasite_dump_thread_seized(struct parasite_ctl *ctl, int id,
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struct pid *tid, struct _CoreEntry *core);
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extern int dump_thread_core(int pid, CoreEntry *core, const struct parasite_dump_thread *dt);
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extern int parasite_drain_fds_seized(struct parasite_ctl *ctl,
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struct parasite_drain_fd *dfds,
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int *lfds, struct fd_opts *flags);
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extern int parasite_get_proc_fd_seized(struct parasite_ctl *ctl);
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extern int parasite_cure_remote(struct parasite_ctl *ctl);
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extern int parasite_cure_local(struct parasite_ctl *ctl);
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extern int parasite_cure_seized(struct parasite_ctl *ctl);
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extern struct parasite_ctl *parasite_infect_seized(pid_t pid,
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struct pstree_item *item,
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struct vm_area_list *vma_area_list,
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struct parasite_drain_fd *dfds,
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int timer_n);
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extern struct parasite_ctl *parasite_prep_ctl(pid_t pid,
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struct vm_area_list *vma_area_list);
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extern int parasite_map_exchange(struct parasite_ctl *ctl, unsigned long size);
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extern struct parasite_tty_args *parasite_dump_tty(struct parasite_ctl *ctl, int fd);
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extern int parasite_init_threads_seized(struct parasite_ctl *ctl, struct pstree_item *item);
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extern int parasite_fini_threads_seized(struct parasite_ctl *ctl);
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extern int syscall_seized(struct parasite_ctl *ctl, int nr, unsigned long *ret,
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unsigned long arg1, unsigned long arg2,
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unsigned long arg3, unsigned long arg4,
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unsigned long arg5, unsigned long arg6);
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extern int __parasite_execute_syscall(struct parasite_ctl *ctl,
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user_regs_struct_t *regs);
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extern bool arch_can_dump_task(pid_t pid);
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extern int parasite_fixup_vdso(struct parasite_ctl *ctl, pid_t pid,
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struct vm_area_list *vma_area_list);
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extern int parasite_stop_on_syscall(int tasks, int sys_nr);
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extern int parasite_unmap(struct parasite_ctl *ctl, unsigned long addr);
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#endif /* __CR_PARASITE_SYSCALL_H__ */
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