mirror of
https://github.com/checkpoint-restore/criu.git
synced 2026-07-23 18:19:39 +00:00
beb158a66e
Dumping is simple. All but secbits can be read from proc, secbits are got from parasite. Restoring is a bit tricky -- when you change anything on kernel cred's struct it performs sophisticated checks and can change some more stuff than requested, so the creds restoration procedure is carefully commented step-by-step. Another thing to mention is that creds are restored after everything else, i.e. right before performing final threads sync and sigreturns. This is done to avoid potential problems with insufficient caps for restoring other stuff (e.g. CAP_DAC_OVERRIDE or zero euid is most likely required for opening any image file and the notorious control /proc/sys/kernel/ns_last_pid, which in turn is performed till the very last moment). Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
151 lines
3.8 KiB
C
151 lines
3.8 KiB
C
#ifndef CRTOOLS_H_
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#define CRTOOLS_H_
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#include <sys/types.h>
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#include "types.h"
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#include "list.h"
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#include "image.h"
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extern struct page_entry zero_page_entry;
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extern void free_pstree(struct list_head *pstree_list);
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#define CR_FD_PERM (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH)
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#define CR_FD_PERM_DUMP (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)
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enum {
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/*
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* Task entries
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*/
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CR_FD_FDINFO,
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CR_FD_PAGES,
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CR_FD_PAGES_SHMEM,
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CR_FD_CORE,
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CR_FD_PIPES,
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CR_FD_SHMEM,
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CR_FD_SIGACT,
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CR_FD_UNIXSK,
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CR_FD_INETSK,
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CR_FD_ITIMERS,
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CR_FD_CREDS,
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/*
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* Global entries
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*/
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CR_FD_PSTREE,
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CR_FD_UTSNS,
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CR_FD_MAX
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};
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enum cr_task_state {
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CR_TASK_RUN,
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CR_TASK_STOP,
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CR_TASK_KILL,
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};
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struct cr_options {
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enum cr_task_state final_state;
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char *show_dump_file;
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bool leader_only;
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bool show_pages_content;
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bool restore_detach;
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bool with_namespaces;
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};
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/* file descriptors template */
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struct cr_fd_desc_tmpl {
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const char *fmt; /* format for the name */
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u32 magic; /* magic in the header */
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};
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extern struct cr_fd_desc_tmpl fdset_template[CR_FD_MAX];
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#define FMT_FNAME_FDINFO "fdinfo-%d.img"
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#define FMT_FNAME_PAGES "pages-%d.img"
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#define FMT_FNAME_PAGES_SHMEM "pages-shmem-%d.img"
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#define FMT_FNAME_CORE "core-%d.img"
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#define FMT_FNAME_CORE_OUT "core-%d.img.out"
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#define FMT_FNAME_PIPES "pipes-%d.img"
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#define FMT_FNAME_PSTREE "pstree-%d.img"
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#define FMT_FNAME_SHMEM "shmem-%d.img"
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#define FMT_FNAME_VMAS "vmas-%d.img"
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#define FMT_FNAME_SIGACTS "sigacts-%d.img"
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#define FMT_FNAME_UNIXSK "unixsk-%d.img"
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#define FMT_FNAME_INETSK "inetsk-%d.img"
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#define FMT_FNAME_ITIMERS "itimers-%d.img"
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#define FMT_FNAME_CREDS "creds-%d.img"
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#define FMT_FNAME_UTSNS "utsns-%d.img"
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extern int get_image_path(char *path, int size, const char *fmt, int pid);
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extern char image_dir[];
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extern int open_image_ro(int type, int pid);
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extern int open_image_ro_nocheck(const char *fmt, int pid);
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#define LAST_PID_PATH "/proc/sys/kernel/ns_last_pid"
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#define LAST_PID_PERM 0666
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struct cr_fdset {
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int fds[CR_FD_MAX];
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};
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#define CR_FD_DESC_USE(type) ((1 << (type)))
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#define CR_FD_DESC_CORE CR_FD_DESC_USE(CR_FD_CORE)
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#define CR_FD_DESC_PSTREE CR_FD_DESC_USE(CR_FD_PSTREE)
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#define CR_FD_DESC_TASK (\
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CR_FD_DESC_USE(CR_FD_FDINFO) |\
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CR_FD_DESC_USE(CR_FD_PAGES) |\
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CR_FD_DESC_USE(CR_FD_PAGES_SHMEM) |\
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CR_FD_DESC_USE(CR_FD_CORE) |\
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CR_FD_DESC_USE(CR_FD_PIPES) |\
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CR_FD_DESC_USE(CR_FD_SHMEM) |\
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CR_FD_DESC_USE(CR_FD_SIGACT) |\
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CR_FD_DESC_USE(CR_FD_UNIXSK) |\
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CR_FD_DESC_USE(CR_FD_INETSK) |\
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CR_FD_DESC_USE(CR_FD_ITIMERS) |\
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CR_FD_DESC_USE(CR_FD_CREDS) )
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#define CR_FD_DESC_NS (\
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CR_FD_DESC_USE(CR_FD_UTSNS) )
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#define CR_FD_DESC_NONE (0)
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int cr_dump_tasks(pid_t pid, struct cr_options *opts);
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int cr_restore_tasks(pid_t pid, struct cr_options *opts);
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int cr_show(unsigned long pid, struct cr_options *opts);
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int convert_to_elf(char *elf_path, int fd_core);
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struct cr_fdset *cr_fdset_open(int pid, unsigned long use_mask, struct cr_fdset *);
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struct cr_fdset *prep_cr_fdset_for_restore(int pid, unsigned long use_mask);
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void close_cr_fdset(struct cr_fdset **cr_fdset);
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void free_mappings(struct list_head *vma_area_list);
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struct vma_area {
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struct list_head list;
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struct vma_entry vma;
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unsigned long shmid;
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int vm_file_fd;
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};
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#define vma_area_is(vma_area, s) vma_entry_is(&((vma_area)->vma), s)
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#define vma_area_len(vma_area) vma_entry_len(&((vma_area)->vma))
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struct pstree_item {
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struct list_head list;
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pid_t pid; /* leader pid */
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u32 nr_children; /* number of children */
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u32 nr_threads; /* number of threads */
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u32 *threads; /* array of threads */
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u32 *children; /* array of children */
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};
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static inline int in_vma_area(struct vma_area *vma, unsigned long addr)
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{
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return addr >= (unsigned long)vma->vma.start &&
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addr < (unsigned long)vma->vma.end;
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}
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#endif /* CRTOOLS_H_ */
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