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exec: Rename bprm->cred_prepared to called_set_creds

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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>
This commit is contained in:
Kees Cook 2017-07-18 15:25:23 -07:00
parent 520eccdfe1
commit ddb4a1442d
7 changed files with 12 additions and 8 deletions
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2
fs/binfmt_flat.c
View File

@ -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);

2
fs/exec.c
View File

@ -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);

8
include/linux/binfmts.h
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@ -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 */

2
security/apparmor/domain.c
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@ -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);

2
security/selinux/hooks.c
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@ -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();

2
security/smack/smack_lsm.c
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@ -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;

2
security/tomoyo/tomoyo.c
View File

@ -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
/*