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691b4a4e7e
Any filesystem syscall, that needs to navigate to inode by it's absolute path performs successive lookup operations for each part of the path. Lookup operation includes access rights check. Usually but not always zdtm tests processes fall under 'other' access category. Also, usually directories don't have 'x' bit set for other. In case when bit 'x' is not set and user-ID and group-ID of a process relate it to 'other', test's will not succeed in performing these syscalls which are most of filesystem api, that has const char *path as part of it arguments (open, openat, mkdir, bind, etc). The observable behavior of that is that zdtm tests fail at file creation ops on one system and pass on the other. The above is not immediately clear to the developer by just looking at failed test's logs. Investigation of that is also not quick for a developer due to the complex structure of zdtm runtime where nested clones with NAMESPACE flags take place alongside with bind-mounts. As an additional note: 'get_current_dir_name' is documented as returning EACCESS in case when some part of the path lacks read/list permissions. But in fact it's not always so. Practice shows, that test processes can get false success on this operation only to fail on later call to something like mkdir/mknod/bind with a given path in arguments. 'get_cwd_check_perm' is a wrapper around 'get_current_dir_name'. It also checks for permissions on the given filepath and logs the error. This directs the developer towards the right investigation path or even eliminates the need for investigation completely. Signed-off-by: Valeriy Vdovin <valeriy.vdovin@virtuozzo.com> |
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| .. | ||
| compel | ||
| exhaustive | ||
| inhfd | ||
| javaTests | ||
| jenkins | ||
| others | ||
| pki | ||
| zdtm | ||
| .gitignore | ||
| abrt.sh | ||
| check_actions.py | ||
| crit-recode.py | ||
| empty-netns-prep.sh | ||
| groups.desc | ||
| inhfd.desc | ||
| Makefile | ||
| pycriu | ||
| show_action.sh | ||
| umount2.c | ||
| zdtm.desc | ||
| zdtm.py | ||
| zdtm_ct.c | ||
| zdtm_mount_cgroups | ||
| zdtm_umount_cgroups | ||