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[PATCH] strndup_user: convert module 

Change hand-coded userspace string copying to strndup_user.

Signed-off-by: Davi Arnaut <davi.arnaut@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Davi Arnaut 2006-03-24 03:18:43 -08:00 committed by Linus Torvalds
parent 96840aa00a
commit 24277dda3a
1 changed files with 3 additions and 16 deletions
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19
kernel/module.c
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@ -1572,7 +1572,6 @@ static struct module *load_module(void __user *umod,
exportindex, modindex, obsparmindex, infoindex, gplindex,
crcindex, gplcrcindex, versindex, pcpuindex, gplfutureindex,
gplfuturecrcindex;
long arglen;
struct module *mod;
long err = 0;
void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
@ -1691,23 +1690,11 @@ static struct module *load_module(void __user *umod,
}
/* Now copy in args */
arglen = strlen_user(uargs);
if (!arglen) {
err = -EFAULT;
args = strndup_user(uargs, ~0UL >> 1);
if (IS_ERR(args)) {
err = PTR_ERR(args);
goto free_hdr;
}
args = kmalloc(arglen, GFP_KERNEL);
if (!args) {
err = -ENOMEM;
goto free_hdr;
}
if (copy_from_user(args, uargs, arglen) != 0) {
err = -EFAULT;
goto free_mod;
}
/* Userspace could have altered the string after the strlen_user() */
args[arglen - 1] = '\0';
if (find_module(mod->name)) {
err = -EEXIST;