[PATCH 27/43] userns: Use uid_eq gid_eq helpers when comparing kuids and kgids in the vfs

"Eric W. Beiderman
2012-04-08T05:13:10Z

From: Eric W. Biederman <ebiederm@xmission.com>

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
fs/attr.c | 8 ++++----
fs/exec.c | 10 +++++-----
fs/fcntl.c | 6 +++---
fs/ioprio.c | 4 ++--
fs/locks.c | 2 +-
fs/namei.c | 8 ++++----
include/linux/quotaops.h | 4 ++--
7 files changed, 21 insertions(+), 21 deletions(-)

diff --git a/fs/attr.c b/fs/attr.c
index 73f69a6..2f094c6 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -47,14 +47,14 @@ int inode_change_ok(const struct inode *inode, struct iattr *attr)

/* Make sure a caller can chown. */
if ((ia_valid & ATTR_UID) &&
- (current_fsuid() != inode->i_uid ||
- attr->ia_uid != inode->i_uid) && !capable(CAP_CHOWN))
+ (!uid_eq(current_fsuid(), inode->i_uid) ||
+ !uid_eq(attr->ia_uid, inode->i_uid)) && !capable(CAP_CHOWN))
return -EPERM;

/* Make sure caller can chgrp. */
if ((ia_valid & ATTR_GID) &&
- (current_fsuid() != inode->i_uid ||
- (!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid)) &&
+ (!uid_eq(current_fsuid(), inode->i_uid) ||
+ (!in_group_p(attr->ia_gid) && gid_eq(attr->ia_gid, inode->i_gid))) &&
!capable(CAP_CHOWN))
return -EPERM;

diff --git a/fs/exec.c b/fs/exec.c
index 9a1d9f0..00ae2ef 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1139,7 +1139,7 @@ void setup_new_exec(struct linux_binprm * bprm)
/* This is the point of no return */
current->sas_ss_sp = current->sas_ss_size = 0;

- if (current_euid() == current_uid() && current_egid() == current_gid())
+ if (uid_eq(current_euid(), current_uid()) && gid_eq(current_egid(), current_gid()))
set_dumpable(current->mm, 1);
else
set_dumpable(current->mm, suid_dumpable);
@@ -1153,8 +1153,8 @@ void setup_new_exec(struct linux_binprm * bprm)
current->mm->task_size = TASK_SIZE;

/* install the new credentials */
- if (bprm->cred->uid != current_euid() ||
- bprm->cred->gid != current_egid()) {
+ if (!uid_eq(bprm->cred->uid, current_euid()) ||
+ !gid_eq(bprm->cred->gid, current_egid())) {
current->pdeath_signal = 0;
} else {
would_dump(bprm, bprm->file);
@@ -2120,7 +2120,7 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
if (__get_dumpable(cprm.mm_flags) == 2) {
/* Setuid core dump mode */
flag = O_EXCL; /* Stop rewrite attacks */
- cred->fsuid = 0; /* Dump root private */
+ cred->fsuid = GLOBAL_ROOT_UID; /* Dump root private */
}

retval = coredump_wait(exit_code, &core_state);
@@ -2221,7 +2221,7 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
* Dont allow local users get cute and trick others to coredump
* into their pre-created files.
*/
- if (inode->i_uid != current_fsuid())
+ if (!uid_eq(inode->i_uid, current_fsuid()))
goto close_fail;
if (!cprm.file->f_op || !cprm.file->f_op->write)
goto close_fail;
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 75e7c1f..d078b75 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -532,9 +532,9 @@ static inline int sigio_perm(struct task_struct *p,

rcu_read_lock();
cred = __task_cred(p);
- ret = ((fown->euid == 0 ||
- fown->euid == cred->suid || fown->euid == cred->uid ||
- fown->uid == cred->suid || fown->uid == cred->uid) &&
+ ret = ((uid_eq(fown->euid, GLOBAL_ROOT_UID) ||
+ uid_eq(fown->euid, cred->suid) || uid_eq(fown->euid, cred->uid) ||
+ uid_eq(fown->uid, cred->suid) || uid_eq(fown->uid, cred->uid)) &&
!security_file_send_sigiotask(p, fown, sig));
rcu_read_unlock();
return ret;
diff --git a/fs/ioprio.c b/fs/ioprio.c
index 2072e41..5e6dbe89 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -37,8 +37,8 @@ int set_task_ioprio(struct task_struct *task, int ioprio)

rcu_read_lock();
tcred = __task_cred(task);
- if (tcred->uid != cred->euid &&
- tcred->uid != cred->uid && !capable(CAP_SYS_NICE)) {
+ if (!uid_eq(tcred->uid, cred->euid) &&
+ !uid_eq(tcred->uid, cred->uid) && !capable(CAP_SYS_NICE)) {
rcu_read_unlock();
return -EPERM;
}
diff --git a/fs/locks.c b/fs/locks.c
index 637694b..3e946cd 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1445,7 +1445,7 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp)
struct inode *inode = dentry->d_inode;
int error;

- if ((current_fsuid() != inode->i_uid) && !capable(CAP_LEASE))
+ if ((!uid_eq(current_fsuid(), inode->i_uid)) && !capable(CAP_LEASE))
return -EACCES;
if (!S_ISREG(inode->i_mode))
return -EINVAL;
diff --git a/fs/namei.c b/fs/namei.c
index 941c436..86512b4 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -228,7 +228,7 @@ static int acl_permission_check(struct inode *inode, int mask)
{
unsigned int mode = inode->i_mode;

- if (likely(current_fsuid() == inode->i_uid))
+ if (likely(uid_eq(current_fsuid(), inode->i_uid)))
mode >>= 6;
else {
if (IS_POSIXACL(inode) && (mode & S_IRWXG)) {
@@ -1956,13 +1956,13 @@ static int user_path_parent(int dfd, const char __user *path,
*/
static inline int check_sticky(struct inode *dir, struct inode *inode)
{
- uid_t fsuid = current_fsuid();
+ kuid_t fsuid = current_fsuid();

if (!(dir->i_mode & S_ISVTX))
return 0;
- if (inode->i_uid == fsuid)
+ if (uid_eq(inode->i_uid, fsuid))
return 0;
- if (dir->i_uid == fsuid)
+ if (uid_eq(dir->i_uid, fsuid))
return 0;
return !inode_capable(inode, CAP_FOWNER);
}
diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
index d93f95e..17b9773 100644
--- a/include/linux/quotaops.h
+++ b/include/linux/quotaops.h
@@ -22,8 +22,8 @@ static inline struct quota_info *sb_dqopt(struct super_block *sb)
static inline bool is_quota_modification(struct inode *inode, struct iattr *ia)
{
return (ia->ia_valid & ATTR_SIZE && ia->ia_size != inode->i_size) ||
- (ia->ia_valid & ATTR_UID && ia->ia_uid != inode->i_uid) ||
- (ia->ia_valid & ATTR_GID && ia->ia_gid != inode->i_gid);
+ (ia->ia_valid & ATTR_UID && !uid_eq(ia->ia_uid, inode->i_uid)) ||
+ (ia->ia_valid & ATTR_GID && !gid_eq(ia->ia_gid, inode->i_gid));
}

#if defined(CONFIG_QUOTA)
--
1.7.2.5