pstore/ram: Strip ramoops header for correct decompression
pstore compression/decompression was added during 3.12. The ramoops driver prepends a "====timestamp.timestamp-C|D\n" header to the compressed record before handing it over to pstore driver which doesn't know about the header. In pstore_decompress(), the pstore driver reads the first "==" as a zlib header, so the decompression always fails. For example, this causes the driver to write /dev/pstore/dmesg-ramoops-0.enc.z instead of /dev/pstore/dmesg-ramoops-0. This patch makes the ramoops driver remove the header before pstore decompression. Signed-off-by: Ben Zhang <benzh@chromium.org> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
parent
0df1f2487d
commit
a28726b4fb
|
@ -135,25 +135,27 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
|
||||||
return prz;
|
return prz;
|
||||||
}
|
}
|
||||||
|
|
||||||
static void ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
|
static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
|
||||||
bool *compressed)
|
bool *compressed)
|
||||||
{
|
{
|
||||||
char data_type;
|
char data_type;
|
||||||
|
int header_length = 0;
|
||||||
|
|
||||||
if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
|
if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec,
|
||||||
&time->tv_sec, &time->tv_nsec, &data_type) == 3) {
|
&time->tv_nsec, &data_type, &header_length) == 3) {
|
||||||
if (data_type == 'C')
|
if (data_type == 'C')
|
||||||
*compressed = true;
|
*compressed = true;
|
||||||
else
|
else
|
||||||
*compressed = false;
|
*compressed = false;
|
||||||
} else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n",
|
} else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n",
|
||||||
&time->tv_sec, &time->tv_nsec) == 2) {
|
&time->tv_sec, &time->tv_nsec, &header_length) == 2) {
|
||||||
*compressed = false;
|
*compressed = false;
|
||||||
} else {
|
} else {
|
||||||
time->tv_sec = 0;
|
time->tv_sec = 0;
|
||||||
time->tv_nsec = 0;
|
time->tv_nsec = 0;
|
||||||
*compressed = false;
|
*compressed = false;
|
||||||
}
|
}
|
||||||
|
return header_length;
|
||||||
}
|
}
|
||||||
|
|
||||||
static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
|
static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
|
||||||
|
@ -165,6 +167,7 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
|
||||||
ssize_t ecc_notice_size;
|
ssize_t ecc_notice_size;
|
||||||
struct ramoops_context *cxt = psi->data;
|
struct ramoops_context *cxt = psi->data;
|
||||||
struct persistent_ram_zone *prz;
|
struct persistent_ram_zone *prz;
|
||||||
|
int header_length;
|
||||||
|
|
||||||
prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
|
prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
|
||||||
cxt->max_dump_cnt, id, type,
|
cxt->max_dump_cnt, id, type,
|
||||||
|
@ -178,7 +181,13 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
|
||||||
if (!prz)
|
if (!prz)
|
||||||
return 0;
|
return 0;
|
||||||
|
|
||||||
|
if (!persistent_ram_old(prz))
|
||||||
|
return 0;
|
||||||
|
|
||||||
size = persistent_ram_old_size(prz);
|
size = persistent_ram_old_size(prz);
|
||||||
|
header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), time,
|
||||||
|
compressed);
|
||||||
|
size -= header_length;
|
||||||
|
|
||||||
/* ECC correction notice */
|
/* ECC correction notice */
|
||||||
ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
|
ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
|
||||||
|
@ -187,8 +196,7 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
|
||||||
if (*buf == NULL)
|
if (*buf == NULL)
|
||||||
return -ENOMEM;
|
return -ENOMEM;
|
||||||
|
|
||||||
memcpy(*buf, persistent_ram_old(prz), size);
|
memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size);
|
||||||
ramoops_read_kmsg_hdr(*buf, time, compressed);
|
|
||||||
persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1);
|
persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1);
|
||||||
|
|
||||||
return size + ecc_notice_size;
|
return size + ecc_notice_size;
|
||||||
|
|
Loading…
Reference in New Issue