[PATCH v3 02/15] exec: Rename bprm->cred_prepared to called_set_creds
From: Kees Cook <hidden>
Date: 2017-07-18 22:25:46
Also in:
linux-fsdevel, lkml
Subsystem:
apparmor security module, exec & binfmt api, elf, filesystems (vfs and infrastructure), security subsystem, selinux security module, smack security module, the rest, tomoyo security module · Maintainers:
John Johansen, John Johansen, Georgia Garcia, Kees Cook, Alexander Viro, Christian Brauner, Paul Moore, James Morris, "Serge E. Hallyn", Stephen Smalley, Casey Schaufler, Linus Torvalds, Kentaro Takeda, Tetsuo Handa
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: John Johansen <john.johansen@canonical.com> Cc: Paul Moore <paul@paul-moore.com> Cc: Stephen Smalley <redacted> Cc: Casey Schaufler <casey@schaufler-ca.com> Cc: James Morris <redacted> Signed-off-by: Kees Cook <redacted> --- 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 2edcefc0a294..a722530cc468 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c@@ -885,7 +885,7 @@ 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 904199086490..925c85a45d97 100644
--- a/fs/exec.c
+++ b/fs/exec.c@@ -1547,7 +1547,7 @@ 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 9508b5f83c7e..36be5a67517a 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 001e133a3c8c..878407e023e3 100644
--- a/security/apparmor/domain.c
+++ b/security/apparmor/domain.c@@ -350,7 +350,7 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm) const char *name = NULL, *info = NULL; int error = 0; - 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 819fd6858b49..0f1450a06b02 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c@@ -2327,7 +2327,7 @@ 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 658f5d8c7e76..7d4b2e221124 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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