On Tue, Mar 7, 2017 at 8:22 AM, Namhyung Kim <namhyung@xxxxxxxxx> wrote:
> On Tue, Mar 7, 2017 at 6:55 AM, Kees Cook <keescook@xxxxxxxxxxxx> wrote:
>> The read/mkfile pair pass the same arguments and should be cleared
>> between calls. Move to a structure and wipe it after every loop.
>>
>> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
>> ---
>> fs/pstore/platform.c | 55 +++++++++++++++++++++++++++-----------------------
>> include/linux/pstore.h | 28 ++++++++++++++++++++++++-
>> 2 files changed, 57 insertions(+), 26 deletions(-)
>>
>> diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
>> index 320a673ecb5b..3fa1575a6e36 100644
>> --- a/fs/pstore/platform.c
>> +++ b/fs/pstore/platform.c
>> @@ -766,16 +766,9 @@ EXPORT_SYMBOL_GPL(pstore_unregister);
>> void pstore_get_records(int quiet)
>> {
>> struct pstore_info *psi = psinfo;
>> - char *buf = NULL;
>> - ssize_t size;
>> - u64 id;
>> - int count;
>> - enum pstore_type_id type;
>> - struct timespec time;
>> + struct pstore_record record = { .psi = psi, };
>> int failed = 0, rc;
>> - bool compressed;
>> int unzipped_len = -1;
>> - ssize_t ecc_notice_size = 0;
>>
>> if (!psi)
>> return;
>> @@ -784,39 +777,51 @@ void pstore_get_records(int quiet)
>> if (psi->open && psi->open(psi))
>> goto out;
>>
>> - while ((size = psi->read(&id, &type, &count, &time, &buf, &compressed,
>> - &ecc_notice_size, psi)) > 0) {
>> - if (compressed && (type == PSTORE_TYPE_DMESG)) {
>> + while ((record.size = psi->read(&record.id, &record.type,
>> + &record.count, &record.time,
>> + &record.buf, &record.compressed,
>> + &record.ecc_notice_size,
>> + record.psi)) > 0) {
>> + if (record.compressed &&
>> + record.type == PSTORE_TYPE_DMESG) {
>> if (big_oops_buf)
>> - unzipped_len = pstore_decompress(buf,
>> - big_oops_buf, size,
>> + unzipped_len = pstore_decompress(
>> + record.buf,
>> + big_oops_buf,
>> + record.size,
>> big_oops_buf_sz);
>>
>> if (unzipped_len > 0) {
>> - if (ecc_notice_size)
>> + if (record.ecc_notice_size)
>> memcpy(big_oops_buf + unzipped_len,
>> - buf + size, ecc_notice_size);
>> - kfree(buf);
>> - buf = big_oops_buf;
>> - size = unzipped_len;
>> - compressed = false;
>> + record.buf + recorrecord.size,
>
> A typo on record.size.
Thanks! Yeah, 0-day noticed this too. I've refreshed the patches in my
tree with the correction now.
-Kees
--
Kees Cook
Pixel Security
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