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authorKees Cook <keescook@chromium.org>2013-02-27 17:03:15 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-27 19:10:11 -0800
commite579d2c259be42b6f29458327e5153b22414b031 (patch)
treeac3babd0f075ddfeb5e6fa083651852b34a0a79f
parent5d1fadc1472396d602f0eeb10d37519e2a14e8bc (diff)
downloadlinux-linaro-stable-e579d2c259be42b6f29458327e5153b22414b031.tar.gz
coredump: remove redundant defines for dumpable states
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@chromium.org> Reported-by: Chen Gang <gang.chen@asianux.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Alan Cox <alan@linux.intel.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Doug Ledford <dledford@redhat.com> Cc: Serge Hallyn <serge.hallyn@canonical.com> Cc: James Morris <james.l.morris@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/coredump.c2
-rw-r--r--fs/exec.c10
-rw-r--r--fs/proc/internal.h3
-rw-r--r--include/linux/sched.h5
-rw-r--r--kernel/sysctl.c2
5 files changed, 9 insertions, 13 deletions
diff --git a/fs/coredump.c b/fs/coredump.c
index 69baf903d3bd..c6479658d487 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 864c50df660a..a96a4885bbbf 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1111,7 +1111,7 @@ 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);
@@ -1639,17 +1639,17 @@ 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);
@@ -1662,7 +1662,7 @@ 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 252544c05207..85ff3a4598b3 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 6853bf947fde..d35d2b6ddbfb 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -346,11 +346,6 @@ 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 d8df00e69c14..d1b4ee67d2df 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2095,7 +2095,7 @@ 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 "\