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landlock: Optimize scope enforcement

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Do not walk through the domain hierarchy when the required scope is not
supported by this domain.  This is the same approach as for filesystem
and network restrictions.

Cc: Mikhail Ivanov <ivanov.mikhail1@huawei-partners.com>
Cc: Tahera Fahimi <fahimitahera@gmail.com>
Reviewed-by: Günther Noack <gnoack@google.com>
Link: https://lore.kernel.org/r/20241109110856.222842-4-mic@digikod.net
Signed-off-by: Mickaël Salaün <mic@digikod.net>
This commit is contained in:
Mickaël Salaün 2024-11-09 12:08:56 +01:00
parent 8376226e5f
commit 03197e40a2
No known key found for this signature in database
GPG Key ID: E5E3D0E88C82F6D2
1 changed files with 15 additions and 3 deletions
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18
security/landlock/task.c
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@ -204,12 +204,17 @@ static bool is_abstract_socket(struct sock *const sock)
return false; return false;
} }
static const struct access_masks unix_scope = {
.scope = LANDLOCK_SCOPE_ABSTRACT_UNIX_SOCKET,
};
static int hook_unix_stream_connect(struct sock *const sock, static int hook_unix_stream_connect(struct sock *const sock,
struct sock *const other, struct sock *const other,
struct sock *const newsk) struct sock *const newsk)
{ {
const struct landlock_ruleset *const dom = const struct landlock_ruleset *const dom =
landlock_get_current_domain(); landlock_get_applicable_domain(landlock_get_current_domain(),
unix_scope);
/* Quick return for non-landlocked tasks. */ /* Quick return for non-landlocked tasks. */
if (!dom) if (!dom)
@ -225,7 +230,8 @@ static int hook_unix_may_send(struct socket *const sock,
struct socket *const other) struct socket *const other)
{ {
const struct landlock_ruleset *const dom = const struct landlock_ruleset *const dom =
landlock_get_current_domain(); landlock_get_applicable_domain(landlock_get_current_domain(),
unix_scope);
if (!dom) if (!dom)
return 0; return 0;
@ -243,6 +249,10 @@ static int hook_unix_may_send(struct socket *const sock,
return 0; return 0;
} }
static const struct access_masks signal_scope = {
.scope = LANDLOCK_SCOPE_SIGNAL,
};
static int hook_task_kill(struct task_struct *const p, static int hook_task_kill(struct task_struct *const p,
struct kernel_siginfo *const info, const int sig, struct kernel_siginfo *const info, const int sig,
const struct cred *const cred) const struct cred *const cred)
@ -256,6 +266,7 @@ static int hook_task_kill(struct task_struct *const p,
} else { } else {
dom = landlock_get_current_domain(); dom = landlock_get_current_domain();
} }
dom = landlock_get_applicable_domain(dom, signal_scope);
/* Quick return for non-landlocked tasks. */ /* Quick return for non-landlocked tasks. */
if (!dom) if (!dom)
@ -279,7 +290,8 @@ static int hook_file_send_sigiotask(struct task_struct *tsk,
/* Lock already held by send_sigio() and send_sigurg(). */ /* Lock already held by send_sigio() and send_sigurg(). */
lockdep_assert_held(&fown->lock); lockdep_assert_held(&fown->lock);
dom = landlock_file(fown->file)->fown_domain; dom = landlock_get_applicable_domain(
landlock_file(fown->file)->fown_domain, signal_scope);
/* Quick return for unowned socket. */ /* Quick return for unowned socket. */
if (!dom) if (!dom)