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More, and hopefully final, fixes after refactor for EFI pstore backend.

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 Version: GnuPG v1
 Comment: Kees Cook <kees@outflux.net>
 
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Merge tag 'pstore-v4.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull pstore fix from Kees Cook:
 "Marta noticed another misbehavior in EFI pstore, which this fixes.

  Hopefully this is the last of the v4.12 fixes for pstore!"

* tag 'pstore-v4.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  efi-pstore: Fix write/erase id tracking
This commit is contained in:
Linus Torvalds 2017-05-22 19:31:07 -07:00
commit fadd2ce5a3
1 changed files with 11 additions and 6 deletions
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17
drivers/firmware/efi/efi-pstore.c
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@ -53,6 +53,7 @@ static int efi_pstore_read_func(struct efivar_entry *entry,
if (sscanf(name, "dump-type%u-%u-%d-%lu-%c",
&record->type, &part, &cnt, &time, &data_type) == 5) {
record->id = generic_id(time, part, cnt);
record->part = part;
record->count = cnt;
record->time.tv_sec = time;
record->time.tv_nsec = 0;
@ -64,6 +65,7 @@ static int efi_pstore_read_func(struct efivar_entry *entry,
} else if (sscanf(name, "dump-type%u-%u-%d-%lu",
&record->type, &part, &cnt, &time) == 4) {
record->id = generic_id(time, part, cnt);
record->part = part;
record->count = cnt;
record->time.tv_sec = time;
record->time.tv_nsec = 0;
@ -77,6 +79,7 @@ static int efi_pstore_read_func(struct efivar_entry *entry,
* multiple logs, remains.
*/
record->id = generic_id(time, part, 0);
record->part = part;
record->count = 0;
record->time.tv_sec = time;
record->time.tv_nsec = 0;
@ -241,9 +244,15 @@ static int efi_pstore_write(struct pstore_record *record)
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
int i, ret = 0;
record->time.tv_sec = get_seconds();
record->time.tv_nsec = 0;
record->id = generic_id(record->time.tv_sec, record->part,
record->count);
snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lu-%c",
record->type, record->part, record->count,
get_seconds(), record->compressed ? 'C' : 'D');
record->time.tv_sec, record->compressed ? 'C' : 'D');
for (i = 0; i < DUMP_NAME_LEN; i++)
efi_name[i] = name[i];
@ -255,7 +264,6 @@ static int efi_pstore_write(struct pstore_record *record)
if (record->reason == KMSG_DUMP_OOPS)
efivar_run_worker();
record->id = record->part;
return ret;
};
@ -287,7 +295,7 @@ static int efi_pstore_erase_func(struct efivar_entry *entry, void *data)
* holding multiple logs, remains.
*/
snprintf(name_old, sizeof(name_old), "dump-type%u-%u-%lu",
ed->record->type, (unsigned int)ed->record->id,
ed->record->type, ed->record->part,
ed->record->time.tv_sec);
for (i = 0; i < DUMP_NAME_LEN; i++)
@ -320,10 +328,7 @@ static int efi_pstore_erase(struct pstore_record *record)
char name[DUMP_NAME_LEN];
efi_char16_t efi_name[DUMP_NAME_LEN];
int found, i;
unsigned int part;
do_div(record->id, 1000);
part = do_div(record->id, 100);
snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lu",
record->type, record->part, record->count,
record->time.tv_sec);