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cred: add kernel_cred() helper

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[ Upstream commit 4c7ceeb62d ]

Access kernel creds based off of init_task. This will let us avoid any
direct access to init_cred.

Link: https://patch.msgid.link/20251103-work-creds-init_cred-v1-2-cb3ec8711a6a@kernel.org
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Stable-dep-of: 981ccd97f7 ("dm: avoid leaking the caller's thread keyring via the table device file")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Brauner
2026-08-03 11:22:11 +02:00
committed by Greg Kroah-Hartman
parent af7a4c2caa
commit dd73cc92a5
1 changed files with 7 additions and 0 deletions
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include/linux/cred.h
+7
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@@ -20,6 +20,8 @@
struct cred;
struct inode;
extern struct task_struct init_task;
/*
* COW Supplementary groups list
*/
@@ -156,6 +158,11 @@ extern struct cred *prepare_exec_creds(void);
extern int commit_creds(struct cred *);
extern void abort_creds(struct cred *);
extern struct cred *prepare_kernel_cred(struct task_struct *);
static inline const struct cred *kernel_cred(void)
{
/* shut up sparse */
return rcu_dereference_raw(init_task.cred);
}
extern int set_security_override(struct cred *, u32);
extern int set_security_override_from_ctx(struct cred *, const char *);
extern int set_create_files_as(struct cred *, struct inode *);