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Restrict filesystem creation if name referred either '.' or '..'

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This change restricts filesystem creation if the given name
contains either '.' or '..'

Reviewed-by: Matt Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Richard Elling <Richard.Elling@RichardElling.com>
Signed-off-by: TulsiJain <tulsi.jain@delphix.com>
Closes #8842 
Closes #8564
This commit is contained in:
Tulsi Jain
2019-06-13 08:56:15 -07:00
committed by Brian Behlendorf
parent 3475724ea4
commit 9c7da9a95a
4 changed files with 36 additions and 1 deletions
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module/zcommon/zfs_namecheck.c
+21
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@@ -232,6 +232,27 @@ entity_namecheck(const char *path, namecheck_err_t *why, char *what)
}
}
if (*end == '\0' || *end == '/') {
int component_length = end - start;
/* Validate the contents of this component is not '.' */
if (component_length == 1) {
if (start[0] == '.') {
if (why)
*why = NAME_ERR_SELF_REF;
return (-1);
}
}
/* Validate the content of this component is not '..' */
if (component_length == 2) {
if (start[0] == '.' && start[1] == '.') {
if (why)
*why = NAME_ERR_PARENT_REF;
return (-1);
}
}
}
/* Snapshot or bookmark delimiter found */
if (*end == '@' || *end == '#') {
/* Multiple delimiters are not allowed */