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Subject[PATCH v5 01/15] exec: Rename bprm->cred_prepared to called_set_creds
Date
The cred_prepared bprm flag has a misleading name. It has nothing to do
with the bprm_prepare_cred hook, and actually tracks if bprm_set_creds has
been called. Rename this flag and improve its comment.

Cc: David Howells <dhowells@redhat.com>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: John Johansen <john.johansen@canonical.com>
Acked-by: James Morris <james.l.morris@oracle.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
---
fs/binfmt_flat.c | 2 +-
fs/exec.c | 2 +-
include/linux/binfmts.h | 8 ++++++--
security/apparmor/domain.c | 2 +-
security/selinux/hooks.c | 2 +-
security/smack/smack_lsm.c | 2 +-
security/tomoyo/tomoyo.c | 2 +-
7 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index a1e6860b6f46..604a176df0c2 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -890,7 +890,7 @@ static int load_flat_shared_library(int id, struct lib_info *libs)
* as we're past the point of no return and are dealing with shared
* libraries.
*/
- bprm.cred_prepared = 1;
+ bprm.called_set_creds = 1;

res = prepare_binprm(&bprm);

diff --git a/fs/exec.c b/fs/exec.c
index 62175cbcc801..a0fff86269e4 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1548,7 +1548,7 @@ int prepare_binprm(struct linux_binprm *bprm)
retval = security_bprm_set_creds(bprm);
if (retval)
return retval;
- bprm->cred_prepared = 1;
+ bprm->called_set_creds = 1;

memset(bprm->buf, 0, BINPRM_BUF_SIZE);
return kernel_read(bprm->file, 0, bprm->buf, BINPRM_BUF_SIZE);
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
index 3ae9013eeaaa..9023e1d2d5cd 100644
--- a/include/linux/binfmts.h
+++ b/include/linux/binfmts.h
@@ -25,8 +25,12 @@ struct linux_binprm {
struct mm_struct *mm;
unsigned long p; /* current top of mem */
unsigned int
- cred_prepared:1,/* true if creds already prepared (multiple
- * preps happen for interpreters) */
+ /*
+ * True after the bprm_set_creds hook has been called once
+ * (multiple calls can be made via prepare_binprm() for
+ * binfmt_script/misc).
+ */
+ called_set_creds:1,
cap_effective:1;/* true if has elevated effective capabilities,
* false if not; except for init which inherits
* its parent's caps anyway */
diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c
index d0594446ae3f..67ec52cfc523 100644
--- a/security/apparmor/domain.c
+++ b/security/apparmor/domain.c
@@ -758,7 +758,7 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm)
file_inode(bprm->file)->i_mode
};

- if (bprm->cred_prepared)
+ if (bprm->called_set_creds)
return 0;

ctx = cred_ctx(bprm->cred);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 33fd061305c4..1db40195d178 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2356,7 +2356,7 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm)

/* SELinux context only depends on initial program or script and not
* the script interpreter */
- if (bprm->cred_prepared)
+ if (bprm->called_set_creds)
return 0;

old_tsec = current_security();
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 463af86812c7..db8e16ec223b 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -917,7 +917,7 @@ static int smack_bprm_set_creds(struct linux_binprm *bprm)
struct superblock_smack *sbsp;
int rc;

- if (bprm->cred_prepared)
+ if (bprm->called_set_creds)
return 0;

isp = inode->i_security;
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index 130b4fa4f65f..d25b705360e0 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -76,7 +76,7 @@ static int tomoyo_bprm_set_creds(struct linux_binprm *bprm)
* Do only if this function is called for the first time of an execve
* operation.
*/
- if (bprm->cred_prepared)
+ if (bprm->called_set_creds)
return 0;
#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
/*
--
2.7.4
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