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https://github.com/checkpoint-restore/criu.git
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70833bcf29
Acked-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Adrian Reber <areber@redhat.com>
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
#ifndef ZDTM_FS_H_
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#define ZDTM_FS_H_
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#ifndef _BSD_SOURCE
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#define _BSD_SOURCE
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#endif
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#include <sys/types.h>
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#include <sys/sysmacros.h>
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#include <limits.h>
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#define KDEV_MINORBITS 20
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#define KDEV_MINORMASK ((1UL << KDEV_MINORBITS) - 1)
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#define MKKDEV(ma, mi) (((ma) << KDEV_MINORBITS) | (mi))
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static inline unsigned int kdev_major(unsigned int kdev)
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{
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return kdev >> KDEV_MINORBITS;
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}
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static inline unsigned int kdev_minor(unsigned int kdev)
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{
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return kdev & KDEV_MINORMASK;
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}
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static inline dev_t kdev_to_odev(unsigned int kdev)
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{
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/*
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* New kernels encode devices in a new form.
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* See kernel's fs/stat.c for details, there
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* choose_32_64 helpers which are the key.
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*/
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unsigned major = kdev_major(kdev);
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unsigned minor = kdev_minor(kdev);
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return makedev(major, minor);
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}
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typedef struct {
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int mnt_id;
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int parent_mnt_id;
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unsigned int s_dev;
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char root[PATH_MAX];
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char mountpoint[PATH_MAX];
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char fsname[64];
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} mnt_info_t;
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extern mnt_info_t *mnt_info_alloc(void);
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extern void mnt_info_free(mnt_info_t **m);
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extern mnt_info_t *get_cwd_mnt_info(void);
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/*
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* get_cwd_check_perm is called to check that cwd is actually usable for a calling
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* process.
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*
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* Example output of a stat command on a '/root' path shows file access bits:
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* > stat /root
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* File: ‘/root’
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* ...
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* Access: (0550/dr-xr-x---) Uid: ( 0/root) Gid: ( 0/root)
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* ^- no 'x' bit for other
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*
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* Here we can see that '/root' dir (that often can be part of cwd path) does not
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* allow non-root user and non-root group to list contents of this directory.
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* Calling process matching 'other' access category may succeed getting cwd path, but will
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* fail performing further filesystem operations based on this path with confusing errors.
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*
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* This function calls get_current_dir_name and explicitly checks that bit 'x' is enabled for
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* a calling process and logs the error.
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*
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* If check passes, stores get_current_dir's result in *result and returns 0
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* If check fails, stores 0 in *result and returns -1
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*/
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extern int get_cwd_check_perm(char **result);
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#endif /* ZDTM_FS_H_ */
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