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libselinux: matchpathcon: bad handling of symlinks in /

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The realpath_not_final() function did not properly handle symlinks in
the / directory.  The reason is because when it determined the symlink
was in the root directory it would set the resolved portion of the path
to /, it would then add a / to the end of the resolved portion, and then
append the symlink name.  The fix is to instead set the resolved portion
to "".  Thus when the '/' at the end of the resolved portion is added it
will be correct.

While I am at it, strip extraneous leading / so that //tmp returns /tmp.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2012-06-20 17:44:17 -04:00
parent 5d19b70723
commit 12e2a0f9fc
1 changed files with 7 additions and 1 deletions
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8
libselinux/src/matchpathcon.c
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@ -361,11 +361,17 @@ int realpath_not_final(const char *name, char *resolved_path)
goto out;
}
/* strip leading // */
while (tmp_path[len] && tmp_path[len] == '/' &&
tmp_path[len+1] && tmp_path[len+1] == '/') {
tmp_path++;
len++;
}
last_component = strrchr(tmp_path, '/');
if (last_component == tmp_path) {
last_component++;
p = strcpy(resolved_path, "/");
p = strcpy(resolved_path, "");
} else if (last_component) {
*last_component = '\0';
last_component++;