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act: use credential guards in acct_write_process() 

Use credential guards for scoped credential override with automatic
restoration on scope exit.

Link: https://patch.msgid.link/20251103-work-creds-guards-simple-v1-14-a3e156839e7f@kernel.org
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-11-03 12:27:02 +01:00
parent c5c92c624a
commit 5db84abd2a
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 13 additions and 16 deletions
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7
kernel/acct.c
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@ -520,12 +520,10 @@ static void fill_ac(struct bsd_acct_struct *acct)
static void acct_write_process(struct bsd_acct_struct *acct) static void acct_write_process(struct bsd_acct_struct *acct)
{ {
struct file *file = acct->file; struct file *file = acct->file;
const struct cred *cred;
acct_t *ac = &acct->ac; acct_t *ac = &acct->ac;
/* Perform file operations on behalf of whoever enabled accounting */ /* Perform file operations on behalf of whoever enabled accounting */
cred = override_creds(file->f_cred); scoped_with_creds(file->f_cred) {
/* /*
* First check to see if there is enough free_space to continue * First check to see if there is enough free_space to continue
* the process accounting system. Then get freeze protection. If * the process accounting system. Then get freeze protection. If
@ -538,8 +536,7 @@ static void acct_write_process(struct bsd_acct_struct *acct)
__kernel_write(file, ac, sizeof(acct_t), &pos); __kernel_write(file, ac, sizeof(acct_t), &pos);
file_end_write(file); file_end_write(file);
} }
}
revert_creds(cred);
} }
static void do_acct_process(struct bsd_acct_struct *acct) static void do_acct_process(struct bsd_acct_struct *acct)