diff options
| author | Kees Cook <keescook@chromium.org> | 2013-11-12 15:11:17 -0800 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2014-05-19 07:54:30 +0200 |
| commit | 65405bf4b82ddf753dea6569948cf686c33d6dba (patch) | |
| tree | 3106e65ac6169b6af67afb7b4aae567c13a800ab /include | |
| parent | a14cc8a6f5bc2e3c491edc92c07e17ba2f94f1d0 (diff) | |
exec/ptrace: fix get_dumpable() incorrect tests
commit d049f74f2dbe71354d43d393ac3a188947811348 upstream
The get_dumpable() return value is not boolean. Most users of the
function actually want to be testing for non-SUID_DUMP_USER(1) rather than
SUID_DUMP_DISABLE(0). The SUID_DUMP_ROOT(2) is also considered a
protected state. Almost all places did this correctly, excepting the two
places fixed in this patch.
Wrong logic:
if (dumpable == SUID_DUMP_DISABLE) { /* be protective */ }
or
if (dumpable == 0) { /* be protective */ }
or
if (!dumpable) { /* be protective */ }
Correct logic:
if (dumpable != SUID_DUMP_USER) { /* be protective */ }
or
if (dumpable != 1) { /* be protective */ }
Without this patch, if the system had set the sysctl fs/suid_dumpable=2, a
user was able to ptrace attach to processes that had dropped privileges to
that user. (This may have been partially mitigated if Yama was enabled.)
The macros have been moved into the file that declares get/set_dumpable(),
which means things like the ia64 code can see them too.
CVE-2013-2929
Reported-by: Vasily Kulikov <segoon@openwall.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[dannf: backported to Debian's 2.6.32]
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/binfmts.h | 3 | ||||
| -rw-r--r-- | include/linux/sched.h | 4 |
2 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h index 9ffffec7ba08..8eab6288ddf1 100644 --- a/include/linux/binfmts.h +++ b/include/linux/binfmts.h @@ -107,9 +107,6 @@ extern int flush_old_exec(struct linux_binprm * bprm); extern void setup_new_exec(struct linux_binprm * bprm); extern int suid_dumpable; -#define SUID_DUMP_DISABLE 0 /* No setuid dumping */ -#define SUID_DUMP_USER 1 /* Dump as user of process */ -#define SUID_DUMP_ROOT 2 /* Dump as root */ /* Stack area protections */ #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ diff --git a/include/linux/sched.h b/include/linux/sched.h index 73c3b9ba95dc..56e1771eb6c8 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -442,6 +442,10 @@ static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) extern void set_dumpable(struct mm_struct *mm, int value); extern int get_dumpable(struct mm_struct *mm); +#define SUID_DUMP_DISABLE 0 /* No setuid dumping */ +#define SUID_DUMP_USER 1 /* Dump as user of process */ +#define SUID_DUMP_ROOT 2 /* Dump as root */ + /* mm flags */ /* dumpable bits */ #define MMF_DUMPABLE 0 /* core dump is permitted */ |