Re: [PATCH][LSM] Early init for security modules and various cleanups

Chris Wright
2003-06-02T09:51:23Z

# This is a BitKeeper generated patch for the following project:
# Project Name: Linux kernel tree
# This patch format is intended for GNU patch command version 2.5 or higher.
# This patch includes the following deltas:
# ChangeSet 1.1262 -> 1.1263
# kernel/sys.c 1.45 -> 1.46
#
# The following is the BitKeeper ChangeSet Log
# --------------------------------------------
# 03/06/02 jakub@redhat.com 1.1263
# [LSM] make sure setfsuid/setfsgid return values are right. Before
# include/linux/security.h was added, setfsuid/setfsgid always returned
# old_fsuid, no matter if the fsuid was actually changed or not. With
# the default security ops it seems to do the same, because both
# security_task_setuid and security_task_post_setuid return 0, but
# these are hooks which seem to return 0 on success, -errno on failure,
# so if some non-default security hook is installed and ever returns
# -errno in setfsuid/setfsgid, -errno will be returned from the syscall
# instead of the expected old_fsuid. This makes it hard to distinguish
# uids 0xfffff001 .. 0xffffffff from errors of security hooks.
# --------------------------------------------
#
diff -Nru a/kernel/sys.c b/kernel/sys.c
--- a/kernel/sys.c Mon Jun 2 01:31:40 2003
+++ b/kernel/sys.c Mon Jun 2 01:31:40 2003
@@ -829,13 +829,11 @@
asmlinkage long sys_setfsuid(uid_t uid)
{
int old_fsuid;
- int retval;
-
- retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS);
- if (retval)
- return retval;

old_fsuid = current->fsuid;
+ if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS))
+ return old_fsuid;
+
if (uid == current->uid || uid == current->euid ||
uid == current->suid || uid == current->fsuid ||
capable(CAP_SETUID))
@@ -848,9 +846,7 @@
current->fsuid = uid;
}

- retval = security_task_post_setuid(old_fsuid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS);
- if (retval)
- return retval;
+ security_task_post_setuid(old_fsuid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS);

return old_fsuid;
}
@@ -861,13 +857,11 @@
asmlinkage long sys_setfsgid(gid_t gid)
{
int old_fsgid;
- int retval;
-
- retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS);
- if (retval)
- return retval;

old_fsgid = current->fsgid;
+ if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS))
+ return old_fsgid;
+
if (gid == current->gid || gid == current->egid ||
gid == current->sgid || gid == current->fsgid ||
capable(CAP_SETGID))