diff options
Diffstat (limited to 'fs/exec.c')
| -rw-r--r-- | fs/exec.c | 33 |
1 files changed, 29 insertions, 4 deletions
@@ -45,6 +45,7 @@ #include <linux/proc_fs.h> #include <linux/mount.h> #include <linux/security.h> +#include <linux/ima.h> #include <linux/syscalls.h> #include <linux/tsacct_kern.h> #include <linux/cn_proc.h> @@ -127,6 +128,9 @@ SYSCALL_DEFINE1(uselib, const char __user *, library) MAY_READ | MAY_EXEC | MAY_OPEN); if (error) goto exit; + error = ima_path_check(&nd.path, MAY_READ | MAY_EXEC | MAY_OPEN); + if (error) + goto exit; file = nameidata_to_filp(&nd, O_RDONLY|O_LARGEFILE); error = PTR_ERR(file); @@ -674,6 +678,9 @@ struct file *open_exec(const char *name) err = inode_permission(nd.path.dentry->d_inode, MAY_EXEC | MAY_OPEN); if (err) goto out_path_put; + err = ima_path_check(&nd.path, MAY_EXEC | MAY_OPEN); + if (err) + goto out_path_put; file = nameidata_to_filp(&nd, O_RDONLY|O_LARGEFILE); if (IS_ERR(file)) @@ -1051,14 +1058,26 @@ EXPORT_SYMBOL(install_exec_creds); */ void check_unsafe_exec(struct linux_binprm *bprm) { - struct task_struct *p = current; + struct task_struct *p = current, *t; + unsigned long flags; + unsigned n_fs, n_sighand; bprm->unsafe = tracehook_unsafe_exec(p); - if (atomic_read(&p->fs->count) > 1 || - atomic_read(&p->files->count) > 1 || - atomic_read(&p->sighand->count) > 1) + n_fs = 1; + n_sighand = 1; + lock_task_sighand(p, &flags); + for (t = next_thread(p); t != p; t = next_thread(t)) { + if (t->fs == p->fs) + n_fs++; + n_sighand++; + } + + if (atomic_read(&p->fs->count) > n_fs || + atomic_read(&p->sighand->count) > n_sighand) bprm->unsafe |= LSM_UNSAFE_SHARE; + + unlock_task_sighand(p, &flags); } /* @@ -1168,6 +1187,9 @@ int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs) retval = security_bprm_check(bprm); if (retval) return retval; + retval = ima_bprm_check(bprm); + if (retval) + return retval; /* kernel module loader fixup */ /* so we don't try to load run modprobe in kernel space. */ @@ -1268,6 +1290,7 @@ int do_execve(char * filename, retval = mutex_lock_interruptible(¤t->cred_exec_mutex); if (retval < 0) goto out_free; + current->in_execve = 1; retval = -ENOMEM; bprm->cred = prepare_exec_creds(); @@ -1321,6 +1344,7 @@ int do_execve(char * filename, goto out; /* execve succeeded */ + current->in_execve = 0; mutex_unlock(¤t->cred_exec_mutex); acct_update_integrals(current); free_bprm(bprm); @@ -1339,6 +1363,7 @@ out_file: } out_unlock: + current->in_execve = 0; mutex_unlock(¤t->cred_exec_mutex); out_free: |