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mcexec_open_exec(): use strncpy_from_user() before accessing file name

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This commit is contained in:
Balazs Gerofi
2017-03-21 20:13:12 +09:00
parent 034d10b185
commit b97a8c5138
1 changed files with 21 additions and 4 deletions
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25
executer/kernel/mcctrl/control.c
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@ -1250,10 +1250,12 @@ int mcexec_open_exec(ihk_os_t os, char * __user filename)
struct mckernel_exec_file *mcef_iter;
int retval;
int os_ind = ihk_host_os_get_index(os);
char *pathbuf, *fullpath;
char *pathbuf = NULL;
char *fullpath = NULL;
char *kfilename = NULL;
struct mcctrl_usrdata *usrdata = ihk_host_os_get_usrdata(os);
struct mcctrl_per_proc_data *ppd = NULL;
int i;
int i, len;
if (os_ind < 0) {
return -EINVAL;
@ -1304,7 +1306,20 @@ int mcexec_open_exec(ihk_os_t os, char * __user filename)
goto out_put_ppd;
}
file = open_exec(filename);
kfilename = kmalloc(PATH_MAX, GFP_TEMPORARY);
if (!kfilename) {
retval = -ENOMEM;
kfree(pathbuf);
goto out_put_ppd;
}
len = strncpy_from_user(kfilename, filename, PATH_MAX);
if (unlikely(len < 0)) {
retval = -EINVAL;
goto out_free;
}
file = open_exec(kfilename);
retval = PTR_ERR(file);
if (IS_ERR(file)) {
goto out_free;
@ -1345,7 +1360,8 @@ int mcexec_open_exec(ihk_os_t os, char * __user filename)
proc_exe_link(os_ind, task_tgid_vnr(current), fullpath);
up(&mckernel_exec_file_lock);
dprintk("%d open_exec and holding file: %s\n", (int)task_tgid_vnr(current), filename);
dprintk("%d open_exec and holding file: %s\n", (int)task_tgid_vnr(current),
kfilename);
kfree(pathbuf);
@ -1355,6 +1371,7 @@ out_put_file:
fput(file);
out_free:
kfree(pathbuf);
kfree(kfilename);
out_put_ppd:
mcctrl_put_per_proc_data(ppd);
out: