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fs: reject invalid last mount id early

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Unique mount ids start past the last valid old mount id value to not
confuse the two. If a last mount id has been specified, reject any
invalid values early.

Link: https://lore.kernel.org/r/20240704-work-mount-fixes-v1-2-d007c990de5f@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-07-04 10:58:35 +02:00
parent 80744d0e7a
commit 4bed843b10
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 7 additions and 1 deletions
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8
fs/namespace.c
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@ -5375,6 +5375,7 @@ SYSCALL_DEFINE4(listmount, const struct mnt_id_req __user *, req,
const size_t maxcount = 1000000;
struct mnt_namespace *ns __free(mnt_ns_release) = NULL;
struct mnt_id_req kreq;
u64 last_mnt_id;
ssize_t ret;
if (flags & ~LISTMOUNT_REVERSE)
@ -5395,6 +5396,11 @@ SYSCALL_DEFINE4(listmount, const struct mnt_id_req __user *, req,
if (ret)
return ret;
last_mnt_id = kreq.param;
/* The first valid unique mount id is MNT_UNIQUE_ID_OFFSET + 1. */
if (last_mnt_id != 0 && last_mnt_id <= MNT_UNIQUE_ID_OFFSET)
return -EINVAL;
kmnt_ids = kvmalloc_array(nr_mnt_ids, sizeof(*kmnt_ids),
GFP_KERNEL_ACCOUNT);
if (!kmnt_ids)
@ -5409,7 +5415,7 @@ SYSCALL_DEFINE4(listmount, const struct mnt_id_req __user *, req,
return -ENOENT;
scoped_guard(rwsem_read, &namespace_sem)
ret = do_listmount(ns, kreq.mnt_id, kreq.param, kmnt_ids,
ret = do_listmount(ns, kreq.mnt_id, last_mnt_id, kmnt_ids,
nr_mnt_ids, (flags & LISTMOUNT_REVERSE));
if (ret <= 0)
return ret;