3.8.13.14 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Kees Cook <keescook@xxxxxxxxxxxx>
commit e579d2c259be42b6f29458327e5153b22414b031 upstream.
The existing SUID_DUMP_* defines duplicate the newer SUID_DUMPABLE_*
defines introduced in 54b501992dd2 ("coredump: warn about unsafe
suid_dumpable / core_pattern combo"). Remove the new ones, and use the
prior values instead.
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reported-by: Chen Gang <gang.chen@xxxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Doug Ledford <dledford@xxxxxxxxxx>
Cc: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
Cc: James Morris <james.l.morris@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
[ kamal: 3.8 stable prereq for
d049f74 exec/ptrace: fix get_dumpable() incorrect tests ]
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
fs/coredump.c | 2 +-
fs/exec.c | 10 +++++-----
fs/proc/internal.h | 3 ++-
include/linux/sched.h | 5 -----
kernel/sysctl.c | 2 +-
5 files changed, 9 insertions(+), 13 deletions(-)
diff --git a/fs/coredump.c b/fs/coredump.c
index 1774932..57b9bd6 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -501,7 +501,7 @@ void do_coredump(siginfo_t *siginfo)
* so we dump it as root in mode 2, and only into a controlled
* environment (pipe handler or fully qualified path).
*/
- if (__get_dumpable(cprm.mm_flags) == SUID_DUMPABLE_SAFE) {
+ if (__get_dumpable(cprm.mm_flags) == SUID_DUMP_ROOT) {
/* Setuid core dump mode */
flag = O_EXCL; /* Stop rewrite attacks */
cred->fsuid = GLOBAL_ROOT_UID; /* Dump root private */
diff --git a/fs/exec.c b/fs/exec.c
index 0b5038a..40418c9 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1114,7 +1114,7 @@ void setup_new_exec(struct linux_binprm * bprm)
current->sas_ss_sp = current->sas_ss_size = 0;
if (uid_eq(current_euid(), current_uid()) && gid_eq(current_egid(), current_gid()))
- set_dumpable(current->mm, SUID_DUMPABLE_ENABLED);
+ set_dumpable(current->mm, SUID_DUMP_USER);
else
set_dumpable(current->mm, suid_dumpable);
@@ -1644,17 +1644,17 @@ EXPORT_SYMBOL(set_binfmt);
void set_dumpable(struct mm_struct *mm, int value)
{
switch (value) {
- case SUID_DUMPABLE_DISABLED:
+ case SUID_DUMP_DISABLE:
clear_bit(MMF_DUMPABLE, &mm->flags);
smp_wmb();
clear_bit(MMF_DUMP_SECURELY, &mm->flags);
break;
- case SUID_DUMPABLE_ENABLED:
+ case SUID_DUMP_USER:
set_bit(MMF_DUMPABLE, &mm->flags);
smp_wmb();
clear_bit(MMF_DUMP_SECURELY, &mm->flags);
break;
- case SUID_DUMPABLE_SAFE:
+ case SUID_DUMP_ROOT:
set_bit(MMF_DUMP_SECURELY, &mm->flags);
smp_wmb();
set_bit(MMF_DUMPABLE, &mm->flags);
@@ -1667,7 +1667,7 @@ int __get_dumpable(unsigned long mm_flags)
int ret;
ret = mm_flags & MMF_DUMPABLE_MASK;
- return (ret > SUID_DUMPABLE_ENABLED) ? SUID_DUMPABLE_SAFE : ret;
+ return (ret > SUID_DUMP_USER) ? SUID_DUMP_ROOT : ret;
}
int get_dumpable(struct mm_struct *mm)
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 252544c..85ff3a4 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -11,6 +11,7 @@
#include <linux/sched.h>
#include <linux/proc_fs.h>
+#include <linux/binfmts.h>
struct ctl_table_header;
struct mempolicy;
@@ -108,7 +109,7 @@ static inline int task_dumpable(struct task_struct *task)
if (mm)
dumpable = get_dumpable(mm);
task_unlock(task);
- if (dumpable == SUID_DUMPABLE_ENABLED)
+ if (dumpable == SUID_DUMP_USER)
return 1;
return 0;
}
diff --git a/include/linux/sched.h b/include/linux/sched.h
index caa76ae..6019ecc 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -378,11 +378,6 @@ static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
extern void set_dumpable(struct mm_struct *mm, int value);
extern int get_dumpable(struct mm_struct *mm);
-/* get/set_dumpable() values */
-#define SUID_DUMPABLE_DISABLED 0
-#define SUID_DUMPABLE_ENABLED 1
-#define SUID_DUMPABLE_SAFE 2
-
/* mm flags */
/* dumpable bits */
#define MMF_DUMPABLE 0 /* core dump is permitted */
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index c88878d..585015f 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2083,7 +2083,7 @@ int proc_dointvec_minmax(struct ctl_table *table, int write,
static void validate_coredump_safety(void)
{
#ifdef CONFIG_COREDUMP
- if (suid_dumpable == SUID_DUMPABLE_SAFE &&
+ if (suid_dumpable == SUID_DUMP_ROOT &&
core_pattern[0] != '/' && core_pattern[0] != '|') {
printk(KERN_WARNING "Unsafe core_pattern used with "\
"suid_dumpable=2. Pipe handler or fully qualified "\
--
1.8.3.2
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