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backing-file: use credential guards for mmap 

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

Link: https://patch.msgid.link/20251103-work-creds-guards-simple-v1-7-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 12:26:55 +01:00
parent b688171f91
commit 6e1d1c1fa7
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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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@ -331,7 +331,6 @@ EXPORT_SYMBOL_GPL(backing_file_splice_write);
int backing_file_mmap(struct file *file, struct vm_area_struct *vma, int backing_file_mmap(struct file *file, struct vm_area_struct *vma,
struct backing_file_ctx *ctx) struct backing_file_ctx *ctx)
{ {
const struct cred *old_cred;
struct file *user_file = vma->vm_file; struct file *user_file = vma->vm_file;
int ret; int ret;
@ -343,9 +342,8 @@ int backing_file_mmap(struct file *file, struct vm_area_struct *vma,
vma_set_file(vma, file); vma_set_file(vma, file);
old_cred = override_creds(ctx->cred); scoped_with_creds(ctx->cred)
ret = vfs_mmap(vma->vm_file, vma); ret = vfs_mmap(vma->vm_file, vma);
revert_creds(old_cred);
if (ctx->accessed) if (ctx->accessed)
ctx->accessed(user_file); ctx->accessed(user_file);