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Add in_execve flag into task_struct.

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This patch allows LSM modules to determine whether current process is in an
execve operation or not so that they can behave differently while an execve
operation is in progress.

This patch is needed by TOMOYO. Please see another patch titled "LSM adapter
functions." for backgrounds.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Kentaro Takeda 2009-02-05 17:18:11 +09:00 committed by James Morris
parent 523979adfa
commit f9ce1f1cda
3 changed files with 8 additions and 0 deletions
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3
fs/compat.c
View file

@ -1402,6 +1402,7 @@ int compat_do_execve(char * filename,
retval = mutex_lock_interruptible(&current->cred_exec_mutex); retval = mutex_lock_interruptible(&current->cred_exec_mutex);
if (retval < 0) if (retval < 0)
goto out_free; goto out_free;
current->in_execve = 1;
retval = -ENOMEM; retval = -ENOMEM;
bprm->cred = prepare_exec_creds(); bprm->cred = prepare_exec_creds();
@ -1454,6 +1455,7 @@ int compat_do_execve(char * filename,
goto out; goto out;
/* execve succeeded */ /* execve succeeded */
current->in_execve = 0;
mutex_unlock(&current->cred_exec_mutex); mutex_unlock(&current->cred_exec_mutex);
acct_update_integrals(current); acct_update_integrals(current);
free_bprm(bprm); free_bprm(bprm);
@ -1470,6 +1472,7 @@ out_file:
} }
out_unlock: out_unlock:
current->in_execve = 0;
mutex_unlock(&current->cred_exec_mutex); mutex_unlock(&current->cred_exec_mutex);
out_free: out_free:

3
fs/exec.c
View file

@ -1278,6 +1278,7 @@ int do_execve(char * filename,
retval = mutex_lock_interruptible(&current->cred_exec_mutex); retval = mutex_lock_interruptible(&current->cred_exec_mutex);
if (retval < 0) if (retval < 0)
goto out_free; goto out_free;
current->in_execve = 1;
retval = -ENOMEM; retval = -ENOMEM;
bprm->cred = prepare_exec_creds(); bprm->cred = prepare_exec_creds();
@ -1331,6 +1332,7 @@ int do_execve(char * filename,
goto out; goto out;
/* execve succeeded */ /* execve succeeded */
current->in_execve = 0;
mutex_unlock(&current->cred_exec_mutex); mutex_unlock(&current->cred_exec_mutex);
acct_update_integrals(current); acct_update_integrals(current);
free_bprm(bprm); free_bprm(bprm);
@ -1349,6 +1351,7 @@ out_file:
} }
out_unlock: out_unlock:
current->in_execve = 0;
mutex_unlock(&current->cred_exec_mutex); mutex_unlock(&current->cred_exec_mutex);
out_free: out_free:

2
include/linux/sched.h
View file

@ -1158,6 +1158,8 @@ struct task_struct {
/* ??? */ /* ??? */
unsigned int personality; unsigned int personality;
unsigned did_exec:1; unsigned did_exec:1;
unsigned in_execve:1; /* Tell the LSMs that the process is doing an
* execve */
pid_t pid; pid_t pid;
pid_t tgid; pid_t tgid;