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If a directory is world-writable or is not owned by root, skip it

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and emit a warning.  This is a security measure since ldconfig
influences the shared libraries used by all programs.

I think the check should be made even more stringent by also
ignoring group-writable directories.  I will make that change soon
unless we encounter a good reason not to do it.

Submitted by:	Maxime Henrion <mhenrion@cybercable.fr>
This commit is contained in:
John Polstra 2000-07-26 04:47:17 +00:00
parent dc2475c540
commit fa0c86aadc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=63872
3 changed files with 35 additions and 5 deletions
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17
sbin/ldconfig/elfhints.c
View File

@ -57,7 +57,22 @@ static int ndirs;
static void
add_dir(const char *hintsfile, const char *name)
{
int i;
struct stat stbuf;
int i;
/* Do some security checks */
if (stat(name, &stbuf) == -1) {
warn("%s", name);
return;
}
if (stbuf.st_uid != 0) {
warnx("%s: not owned by root", name);
return;
}
if ((stbuf.st_mode & S_IWOTH) != 0) {
warnx("%s: ignoring world-writable directory", name);
return;
}
for (i = 0; i < ndirs; i++)
if (strcmp(dirs[i], name) == 0)

8
sbin/ldconfig/ldconfig.8
View File

@ -61,7 +61,10 @@ line. Blank lines and lines starting with the comment character
.Ql \&#
are ignored.
.Pp
The shared libraries so found will be automatically available for loading
For security reasons, directories which are world-writable or which
are not owned by root produce warning messages and are skipped.
.Pp
The shared libraries which are found will be automatically available for loading
if needed by the program being prepared for execution.
This obviates the need
for storing search paths within the executable.
@ -137,9 +140,6 @@ In
addition to building a set of hints for quick lookup, it also serves to
specify the trusted collection of directories from which shared objects can
be safely loaded.
It is presumed that the set of directories specified to
.Nm ldconfig
are under control of the system's administrator.
.Sh ENVIRONMENT
.Bl -tag -width OBJFORMATxxx -compact
.It Ev OBJFORMAT

15
sbin/ldconfig/ldconfig.c
View File

@ -259,6 +259,7 @@ int silent;
{
DIR *dd;
struct dirent *dp;
struct stat stbuf;
char name[MAXPATHLEN];
int dewey[MAXDEWEY], ndewey;
@ -269,6 +270,20 @@ int silent;
return -1;
}
/* Do some security checks */
if (fstat(dirfd(dd), &stbuf) == -1) {
warn("%s", dir);
return -1;
}
if (stbuf.st_uid != 0) {
warnx("%s: not owned by root", dir);
return -1;
}
if ((stbuf.st_mode & S_IWOTH) != 0) {
warnx("%s: ignoring world-writable directory", dir);
return -1;
}
while ((dp = readdir(dd)) != NULL) {
register int n;
register char *cp;