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bcachefs: Fix BCH_IOCTL_FSCK_OFFLINE for encrypted filesystems

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To open an encrypted filesystem, we use request_key() to get the
encryption key from the user's keyring - but request_key() needs to
happen in the context of the process that invoked the ioctl.

This easily fixed by using bch2_fs_open() in nostart mode.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-04-05 22:23:29 -04:00
parent cf979fca9a
commit 374b3d38fe
1 changed files with 50 additions and 44 deletions
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94
fs/bcachefs/chardev.c
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@ -134,42 +134,38 @@ static long bch2_ioctl_incremental(struct bch_ioctl_incremental __user *user_arg
struct fsck_thread {
struct thread_with_stdio thr;
struct bch_fs *c;
char **devs;
size_t nr_devs;
struct bch_opts opts;
};
static void bch2_fsck_thread_exit(struct thread_with_stdio *_thr)
{
struct fsck_thread *thr = container_of(_thr, struct fsck_thread, thr);
if (thr->devs)
for (size_t i = 0; i < thr->nr_devs; i++)
kfree(thr->devs[i]);
kfree(thr->devs);
kfree(thr);
}
static int bch2_fsck_offline_thread_fn(struct thread_with_stdio *stdio)
{
struct fsck_thread *thr = container_of(stdio, struct fsck_thread, thr);
struct bch_fs *c = bch2_fs_open(thr->devs, thr->nr_devs, thr->opts);
struct bch_fs *c = thr->c;
if (IS_ERR(c))
return PTR_ERR(c);
int ret = PTR_ERR_OR_ZERO(c);
if (ret)
return ret;
int ret = 0;
if (test_bit(BCH_FS_errors_fixed, &c->flags))
ret |= 1;
if (test_bit(BCH_FS_error, &c->flags))
ret |= 4;
ret = bch2_fs_start(thr->c);
if (ret)
goto err;
bch2_fs_stop(c);
if (ret & 1)
if (test_bit(BCH_FS_errors_fixed, &c->flags)) {
bch2_stdio_redirect_printf(&stdio->stdio, false, "%s: errors fixed\n", c->name);
if (ret & 4)
ret |= 1;
}
if (test_bit(BCH_FS_error, &c->flags)) {
bch2_stdio_redirect_printf(&stdio->stdio, false, "%s: still has errors\n", c->name);
ret |= 4;
}
err:
bch2_fs_stop(c);
return ret;
}
@ -182,7 +178,7 @@ static long bch2_ioctl_fsck_offline(struct bch_ioctl_fsck_offline __user *user_a
{
struct bch_ioctl_fsck_offline arg;
struct fsck_thread *thr = NULL;
u64 *devs = NULL;
darray_str(devs) = {};
long ret = 0;
if (copy_from_user(&arg, user_arg, sizeof(arg)))
@ -194,28 +190,31 @@ static long bch2_ioctl_fsck_offline(struct bch_ioctl_fsck_offline __user *user_a
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!(devs = kcalloc(arg.nr_devs, sizeof(*devs), GFP_KERNEL)) ||
!(thr = kzalloc(sizeof(*thr), GFP_KERNEL)) ||
!(thr->devs = kcalloc(arg.nr_devs, sizeof(*thr->devs), GFP_KERNEL))) {
for (size_t i = 0; i < arg.nr_devs; i++) {
u64 dev_u64;
ret = copy_from_user_errcode(&dev_u64, &user_arg->devs[i], sizeof(u64));
if (ret)
goto err;
char *dev_str = strndup_user((char __user *)(unsigned long) dev_u64, PATH_MAX);
ret = PTR_ERR_OR_ZERO(dev_str);
if (ret)
goto err;
ret = darray_push(&devs, dev_str);
if (ret) {
kfree(dev_str);
goto err;
}
}
thr = kzalloc(sizeof(*thr), GFP_KERNEL);
if (!thr) {
ret = -ENOMEM;
goto err;
}
thr->opts = bch2_opts_empty();
thr->nr_devs = arg.nr_devs;
if (copy_from_user(devs, &user_arg->devs[0],
array_size(sizeof(user_arg->devs[0]), arg.nr_devs))) {
ret = -EINVAL;
goto err;
}
for (size_t i = 0; i < arg.nr_devs; i++) {
thr->devs[i] = strndup_user((char __user *)(unsigned long) devs[i], PATH_MAX);
ret = PTR_ERR_OR_ZERO(thr->devs[i]);
if (ret)
goto err;
}
if (arg.opts) {
char *optstr = strndup_user((char __user *)(unsigned long) arg.opts, 1 << 16);
@ -230,15 +229,22 @@ static long bch2_ioctl_fsck_offline(struct bch_ioctl_fsck_offline __user *user_a
opt_set(thr->opts, stdio, (u64)(unsigned long)&thr->thr.stdio);
/* We need request_key() to be called before we punt to kthread: */
opt_set(thr->opts, nostart, true);
thr->c = bch2_fs_open(devs.data, arg.nr_devs, thr->opts);
ret = bch2_run_thread_with_stdio(&thr->thr, &bch2_offline_fsck_ops);
err:
if (ret < 0) {
if (thr)
bch2_fsck_thread_exit(&thr->thr);
pr_err("ret %s", bch2_err_str(ret));
}
kfree(devs);
out:
darray_for_each(devs, i)
kfree(*i);
darray_exit(&devs);
return ret;
err:
if (thr)
bch2_fsck_thread_exit(&thr->thr);
pr_err("ret %s", bch2_err_str(ret));
goto out;
}
static long bch2_global_ioctl(unsigned cmd, void __user *arg)