86 lines
2.8 KiB
Diff
86 lines
2.8 KiB
Diff
Fix for CVE-2010-3847.
|
|
|
|
2010-10-18 Andreas Schwab <schwab@redhat.com>
|
|
|
|
* elf/dl-load.c (is_dst): Remove last parameter.
|
|
(_dl_dst_count): Ignore $ORIGIN in privileged programs.
|
|
(_dl_dst_substitute): Likewise.
|
|
---
|
|
elf/dl-load.c | 30 +++++++++++++-----------------
|
|
1 files changed, 13 insertions(+), 17 deletions(-)
|
|
|
|
diff --git a/elf/dl-load.c b/elf/dl-load.c
|
|
index a7162eb..776f7e4 100644
|
|
--- a/elf/dl-load.c
|
|
+++ b/elf/dl-load.c
|
|
@@ -169,8 +169,7 @@ local_strdup (const char *s)
|
|
|
|
|
|
static size_t
|
|
-is_dst (const char *start, const char *name, const char *str,
|
|
- int is_path, int secure)
|
|
+is_dst (const char *start, const char *name, const char *str, int is_path)
|
|
{
|
|
size_t len;
|
|
bool is_curly = false;
|
|
@@ -199,11 +198,6 @@ is_dst (const char *start, const char *name, const char *str,
|
|
&& (!is_path || name[len] != ':'))
|
|
return 0;
|
|
|
|
- if (__builtin_expect (secure, 0)
|
|
- && ((name[len] != '\0' && (!is_path || name[len] != ':'))
|
|
- || (name != start + 1 && (!is_path || name[-2] != ':'))))
|
|
- return 0;
|
|
-
|
|
return len;
|
|
}
|
|
|
|
@@ -218,13 +212,12 @@ _dl_dst_count (const char *name, int is_path)
|
|
{
|
|
size_t len;
|
|
|
|
- /* $ORIGIN is not expanded for SUID/GUID programs (except if it
|
|
- is $ORIGIN alone) and it must always appear first in path. */
|
|
+ /* $ORIGIN is not expanded for SUID/GUID programs. */
|
|
++name;
|
|
- if ((len = is_dst (start, name, "ORIGIN", is_path,
|
|
- INTUSE(__libc_enable_secure))) != 0
|
|
- || (len = is_dst (start, name, "PLATFORM", is_path, 0)) != 0
|
|
- || (len = is_dst (start, name, "LIB", is_path, 0)) != 0)
|
|
+ if (((len = is_dst (start, name, "ORIGIN", is_path)) != 0
|
|
+ && !INTUSE(__libc_enable_secure))
|
|
+ || (len = is_dst (start, name, "PLATFORM", is_path)) != 0
|
|
+ || (len = is_dst (start, name, "LIB", is_path)) != 0)
|
|
++cnt;
|
|
|
|
name = strchr (name + len, '$');
|
|
@@ -256,9 +249,12 @@ _dl_dst_substitute (struct link_map *l, const char *name, char *result,
|
|
size_t len;
|
|
|
|
++name;
|
|
- if ((len = is_dst (start, name, "ORIGIN", is_path,
|
|
- INTUSE(__libc_enable_secure))) != 0)
|
|
+ if ((len = is_dst (start, name, "ORIGIN", is_path)) != 0)
|
|
{
|
|
+ /* Ignore this path element in SUID/SGID programs. */
|
|
+ if (INTUSE(__libc_enable_secure))
|
|
+ repl = (const char *) -1;
|
|
+ else
|
|
#ifndef SHARED
|
|
if (l == NULL)
|
|
repl = _dl_get_origin ();
|
|
@@ -266,9 +262,9 @@ _dl_dst_substitute (struct link_map *l, const char *name, char *result,
|
|
#endif
|
|
repl = l->l_origin;
|
|
}
|
|
- else if ((len = is_dst (start, name, "PLATFORM", is_path, 0)) != 0)
|
|
+ else if ((len = is_dst (start, name, "PLATFORM", is_path)) != 0)
|
|
repl = GLRO(dl_platform);
|
|
- else if ((len = is_dst (start, name, "LIB", is_path, 0)) != 0)
|
|
+ else if ((len = is_dst (start, name, "LIB", is_path)) != 0)
|
|
repl = DL_DST_LIB;
|
|
|
|
if (repl != NULL && repl != (const char *) -1)
|
|
--
|
|
1.7.2.3
|