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Switch to prepare_creds/commit_creds

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Update API as per kernel doc recommends, also fix setup_groups refcount
leak while at it.
This commit is contained in:
Wang Han
2025-06-10 22:43:27 +08:00
committed by ShirkNeko
parent 6a9186300b
commit 1bac30930f
1 changed files with 10 additions and 8 deletions
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18
kernel/core_hook.c
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@@ -110,6 +110,7 @@ static void setup_groups(struct root_profile *profile, struct cred *cred)
groups_sort(group_info);
set_groups(cred, group_info);
put_group_info(group_info);
}
static void disable_seccomp()
@@ -134,18 +135,18 @@ void escape_to_root(void)
{
struct cred *cred;
rcu_read_lock();
do {
cred = (struct cred *)__task_cred((current));
BUG_ON(!cred);
} while (!get_cred_rcu(cred));
cred = prepare_creds();
if (!cred) {
pr_warn("prepare_creds failed!\n");
return;
}
if (cred->euid.val == 0) {
pr_warn("Already root, don't escape!\n");
rcu_read_unlock();
abort_creds(cred);
return;
}
struct root_profile *profile = ksu_get_root_profile(cred->uid.val);
cred->uid.val = profile->uid;
@@ -176,7 +177,7 @@ void escape_to_root(void)
setup_groups(profile, cred);
rcu_read_unlock();
commit_creds(cred);
// Refer to kernel/seccomp.c: seccomp_set_mode_strict
// When disabling Seccomp, ensure that current->sighand->siglock is held during the operation.
@@ -243,6 +244,7 @@ static void nuke_ext4_sysfs() {
}
ext4_unregister_sysfs(sb);
path_put(&path);
}
#else
static inline void nuke_ext4_sysfs() { }