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>

diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 3b57443..ec881b3 100644 (file)
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -135,25 +135,27 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
        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)
 {
        char data_type;
+       int header_length = 0;
 
-       if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
-                       &time->tv_sec, &time->tv_nsec, &data_type) == 3) {
+       if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec,
+                       &time->tv_nsec, &data_type, &header_length) == 3) {
                if (data_type == 'C')
                        *compressed = true;
                else
                        *compressed = false;
-       } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n",
-                       &time->tv_sec, &time->tv_nsec) == 2) {
+       } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n",
+                       &time->tv_sec, &time->tv_nsec, &header_length) == 2) {
                        *compressed = false;
        } else {
                time->tv_sec = 0;
                time->tv_nsec = 0;
                *compressed = false;
        }
+       return header_length;
 }
 
 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;
        struct ramoops_context *cxt = psi->data;
        struct persistent_ram_zone *prz;
+       int header_length;
 
        prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
                                   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)
                return 0;
 
+       if (!persistent_ram_old(prz))
+               return 0;
+
        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_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)
                return -ENOMEM;
 
-       memcpy(*buf, persistent_ram_old(prz), size);
-       ramoops_read_kmsg_hdr(*buf, time, compressed);
+       memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size);
        persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1);
 
        return size + ecc_notice_size;