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backing-file: use credential guards for splice read 

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

Link: https://patch.msgid.link/20251103-work-creds-guards-simple-v1-5-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 12:26:53 +01:00
parent f119feaa06
commit c3076d146e
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 2 additions and 4 deletions
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6
fs/backing-file.c
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@ -283,15 +283,13 @@ ssize_t backing_file_splice_read(struct file *in, struct kiocb *iocb,
unsigned int flags,
struct backing_file_ctx *ctx)
{
const struct cred *old_cred;
ssize_t ret;
if (WARN_ON_ONCE(!(in->f_mode & FMODE_BACKING)))
return -EIO;
old_cred = override_creds(ctx->cred);
ret = vfs_splice_read(in, &iocb->ki_pos, pipe, len, flags);
revert_creds(old_cred);
scoped_with_creds(ctx->cred)
ret = vfs_splice_read(in, &iocb->ki_pos, pipe, len, flags);
if (ctx->accessed)
ctx->accessed(iocb->ki_filp);