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pstore: Add priv field to pstore_record for backend specific use

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The EFI pstore backend will need to store per-record variable name data
when we switch away from the efivars layer. Add a priv field to struct
pstore_record, and document it as holding a backend specific pointer
that is assumed to be a kmalloc()d buffer, and will be kfree()d when the
entire record is freed.

Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel
2022-06-22 09:31:31 +02:00
parent f662092b2e
commit 8ca869b245
3 changed files with 6 additions and 0 deletions
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1
fs/pstore/inode.c
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@@ -55,6 +55,7 @@ static void free_pstore_private(struct pstore_private *private)
return; return;
if (private->record) { if (private->record) {
kfree(private->record->buf); kfree(private->record->buf);
kfree(private->record->priv);
kfree(private->record); kfree(private->record);
} }
kfree(private); kfree(private);

1
fs/pstore/platform.c
View File

@@ -769,6 +769,7 @@ void pstore_get_backend_records(struct pstore_info *psi,
if (rc) { if (rc) {
/* pstore_mkfile() did not take record, so free it. */ /* pstore_mkfile() did not take record, so free it. */
kfree(record->buf); kfree(record->buf);
kfree(record->priv);
kfree(record); kfree(record);
if (rc != -EEXIST || !quiet) if (rc != -EEXIST || !quiet)
failed++; failed++;

4
include/linux/pstore.h
View File

@@ -57,6 +57,9 @@ struct pstore_info;
* @size: size of @buf * @size: size of @buf
* @ecc_notice_size: * @ecc_notice_size:
* ECC information for @buf * ECC information for @buf
* @priv: pointer for backend specific use, will be
* kfree()d by the pstore core if non-NULL
* when the record is freed.
* *
* Valid for PSTORE_TYPE_DMESG @type: * Valid for PSTORE_TYPE_DMESG @type:
* *
@@ -74,6 +77,7 @@ struct pstore_record {
char *buf; char *buf;
ssize_t size; ssize_t size;
ssize_t ecc_notice_size; ssize_t ecc_notice_size;
void *priv;
int count; int count;
enum kmsg_dump_reason reason; enum kmsg_dump_reason reason;