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dpkg: prevent important directories from being removed

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busybox will remove directory symlinks, which is at
odds with common layouts that have some of
bin/lib/lib32/lib64 symlinked.

this adds a exludelist for critcal and often symlinked
directories.

Fixes: Bug 12551

function                                             old     new   delta
remove_file_array                                    139     231     +92

Signed-off-by: Norbert Lange <nolange79@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Norbert Lange 2020-02-14 22:15:07 +01:00 committed by Denys Vlasenko
parent a16c8ef212
commit 86a633ef9a
1 changed files with 23 additions and 0 deletions
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23
archival/dpkg.c
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@ -1204,6 +1204,27 @@ static char **create_list(const char *filename)
return file_list;
}
/** This tests if the filename is an "important" directory, which might be symlinked.
* Debians dpkg test if directories are used by other packages, this
* implementation doesn't and would remove for ex. an lib -> usr/lib symlink.
*/
static int is_builtin_exclude(const char *name)
{
if (*name++ != '/')
return 0;
if (index_in_strings(".\0" "etc\0" "opt\0" "srv\0" "var\0" "var/lib\0",
name) >= 0)
return 1;
if (is_prefixed_with(name, "usr/")) {
name += sizeof("usr/") - 1;
if (is_prefixed_with(name, "local/"))
name += sizeof("local/") - 1;
}
return index_in_strings("bin\0" "lib\0" "lib32\0" "lib64\0" "sbin\0",
name) >= 0;
}
/* maybe i should try and hook this into remove_file.c somehow */
static int remove_file_array(char **remove_names, char **exclude_names)
{
@ -1215,6 +1236,8 @@ static int remove_file_array(char **remove_names, char **exclude_names)
return 0;
}
for (i = 0; remove_names[i] != NULL; i++) {
if (is_builtin_exclude(remove_names[i]))
continue;
if (exclude_names != NULL) {
for (j = 0; exclude_names[j] != NULL; j++) {
if (strcmp(remove_names[i], exclude_names[j]) == 0) {