From be619f7f063a49c656f620a46af4f8ea3e759e91 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Mon, 13 Jul 2020 12:06:48 -0500 Subject: exec: Implement kernel_execve To allow the kernel not to play games with set_fs to call exec implement kernel_execve. The function kernel_execve takes pointers into kernel memory and copies the values pointed to onto the new userspace stack. The calls with arguments from kernel space of do_execve are replaced with calls to kernel_execve. The calls do_execve and do_execveat are made static as there are now no callers outside of exec. The comments that mention do_execve are updated to refer to kernel_execve or execve depending on the circumstances. In addition to correcting the comments, this makes it easy to grep for do_execve and verify it is not used. Inspired-by: https://lkml.kernel.org/r/20200627072704.2447163-1-hch@lst.de Reviewed-by: Kees Cook Link: https://lkml.kernel.org/r/87wo365ikj.fsf@x220.int.ebiederm.org Signed-off-by: "Eric W. Biederman" --- security/tomoyo/common.h | 2 +- security/tomoyo/domain.c | 4 ++-- security/tomoyo/tomoyo.c | 4 ++-- 3 files changed, 5 insertions(+), 5 deletions(-) (limited to 'security') diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h index 050473df5809..85246b9df7ca 100644 --- a/security/tomoyo/common.h +++ b/security/tomoyo/common.h @@ -425,7 +425,7 @@ struct tomoyo_request_info { struct tomoyo_obj_info *obj; /* * For holding parameters specific to execve() request. - * NULL if not dealing do_execve(). + * NULL if not dealing execve(). */ struct tomoyo_execve *ee; struct tomoyo_domain_info *domain; diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c index 7869d6a9980b..53b3e1f5f227 100644 --- a/security/tomoyo/domain.c +++ b/security/tomoyo/domain.c @@ -767,7 +767,7 @@ retry: /* * Check for domain transition preference if "file execute" matched. - * If preference is given, make do_execve() fail if domain transition + * If preference is given, make execve() fail if domain transition * has failed, for domain transition preference should be used with * destination domain defined. */ @@ -810,7 +810,7 @@ force_reset_domain: snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", candidate->name); /* - * Make do_execve() fail if domain transition across namespaces + * Make execve() fail if domain transition across namespaces * has failed. */ reject_on_transition_failure = true; diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c index f9adddc42ac8..1f3cd432d830 100644 --- a/security/tomoyo/tomoyo.c +++ b/security/tomoyo/tomoyo.c @@ -93,7 +93,7 @@ static int tomoyo_bprm_check_security(struct linux_binprm *bprm) struct tomoyo_task *s = tomoyo_task(current); /* - * Execute permission is checked against pathname passed to do_execve() + * Execute permission is checked against pathname passed to execve() * using current domain. */ if (!s->old_domain_info) { @@ -307,7 +307,7 @@ static int tomoyo_file_fcntl(struct file *file, unsigned int cmd, */ static int tomoyo_file_open(struct file *f) { - /* Don't check read permission here if called from do_execve(). */ + /* Don't check read permission here if called from execve(). */ if (current->in_execve) return 0; return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, -- cgit v1.2.3