coredump masking: reimplementation of dumpable using two flags

This patch changes mm_struct.dumpable to a pair of bit flags.

set_dumpable() converts three-value dumpable to two flags and stores it into
lower two bits of mm_struct.flags instead of mm_struct.dumpable.
get_dumpable() behaves in the opposite way.

[akpm@linux-foundation.org: export set_dumpable]
Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: David Howells <dhowells@redhat.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 2 insertions, 2 deletions

diff --git a/security/commoncap.c b/security/commoncap.c
index 384379ede4fd..338606eb7238 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -148,7 +148,7 @@ void cap_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
 
         if (bprm->e_uid != current->uid || bprm->e_gid != current->gid ||
             !cap_issubset (new_permitted, current->cap_permitted)) {
-                current->mm->dumpable = suid_dumpable;
+                set_dumpable(current->mm, suid_dumpable);
 
                 if (unsafe & ~LSM_UNSAFE_PTRACE_CAP) {
                         if (!capable(CAP_SETUID)) {
diff --git a/security/dummy.c b/security/dummy.c
index d6a112ce2975..19d813d5e083 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -130,7 +130,7 @@ static void dummy_bprm_free_security (struct linux_binprm *bprm)
 static void dummy_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
 {
         if (bprm->e_uid != current->uid || bprm->e_gid != current->gid) {
-                current->mm->dumpable = suid_dumpable;
+                set_dumpable(current->mm, suid_dumpable);
 
                 if ((unsafe & ~LSM_UNSAFE_PTRACE_CAP) && !capable(CAP_SETUID)) {
                         bprm->e_uid = current->uid;