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pstore: Extract common arguments into structure

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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@chromium.org>
This commit is contained in:
Kees Cook 2017-03-03 16:59:29 -08:00
parent 0edae0b3ff
commit 9abdcccc3d
2 changed files with 57 additions and 26 deletions
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55
fs/pstore/platform.c
View File

@ -766,16 +766,9 @@ EXPORT_SYMBOL_GPL(pstore_unregister);
void pstore_get_records(int quiet) void pstore_get_records(int quiet)
{ {
struct pstore_info *psi = psinfo; struct pstore_info *psi = psinfo;
char *buf = NULL; struct pstore_record record = { .psi = psi, };
ssize_t size;
u64 id;
int count;
enum pstore_type_id type;
struct timespec time;
int failed = 0, rc; int failed = 0, rc;
bool compressed;
int unzipped_len = -1; int unzipped_len = -1;
ssize_t ecc_notice_size = 0;
if (!psi) if (!psi)
return; return;
@ -784,39 +777,51 @@ void pstore_get_records(int quiet)
if (psi->open && psi->open(psi)) if (psi->open && psi->open(psi))
goto out; goto out;
while ((size = psi->read(&id, &type, &count, &time, &buf, &compressed, while ((record.size = psi->read(&record.id, &record.type,
&ecc_notice_size, psi)) > 0) { &record.count, &record.time,
if (compressed && (type == PSTORE_TYPE_DMESG)) { &record.buf, &record.compressed,
&record.ecc_notice_size,
record.psi)) > 0) {
if (record.compressed &&
record.type == PSTORE_TYPE_DMESG) {
if (big_oops_buf) if (big_oops_buf)
unzipped_len = pstore_decompress(buf, unzipped_len = pstore_decompress(
big_oops_buf, size, record.buf,
big_oops_buf,
record.size,
big_oops_buf_sz); big_oops_buf_sz);
if (unzipped_len > 0) { if (unzipped_len > 0) {
if (ecc_notice_size) if (record.ecc_notice_size)
memcpy(big_oops_buf + unzipped_len, memcpy(big_oops_buf + unzipped_len,
buf + size, ecc_notice_size); record.buf + record.size,
kfree(buf); record.ecc_notice_size);
buf = big_oops_buf; kfree(record.buf);
size = unzipped_len; record.buf = big_oops_buf;
compressed = false; record.size = unzipped_len;
record.compressed = false;
} else { } else {
pr_err("decompression failed;returned %d\n", pr_err("decompression failed;returned %d\n",
unzipped_len); unzipped_len);
compressed = true; record.compressed = true;
} }
} }
rc = pstore_mkfile(type, psi->name, id, count, buf, rc = pstore_mkfile(record.type, psi->name, record.id,
compressed, size + ecc_notice_size, record.count, record.buf,
time, psi); record.compressed,
record.size + record.ecc_notice_size,
record.time, record.psi);
if (unzipped_len < 0) { if (unzipped_len < 0) {
/* Free buffer other than big oops */ /* Free buffer other than big oops */
kfree(buf); kfree(record.buf);
buf = NULL; record.buf = NULL;
} else } else
unzipped_len = -1; unzipped_len = -1;
if (rc && (rc != -EEXIST || !quiet)) if (rc && (rc != -EEXIST || !quiet))
failed++; failed++;
memset(&record, 0, sizeof(record));
record.psi = psi;
} }
if (psi->close) if (psi->close)
psi->close(psi); psi->close(psi);

28
include/linux/pstore.h
View File

@ -30,6 +30,8 @@
#include <linux/time.h> #include <linux/time.h>
#include <linux/types.h> #include <linux/types.h>
struct module;
/* pstore record types (see fs/pstore/inode.c for filename templates) */ /* pstore record types (see fs/pstore/inode.c for filename templates) */
enum pstore_type_id { enum pstore_type_id {
PSTORE_TYPE_DMESG = 0, PSTORE_TYPE_DMESG = 0,
@ -45,7 +47,31 @@ enum pstore_type_id {
PSTORE_TYPE_UNKNOWN = 255 PSTORE_TYPE_UNKNOWN = 255
}; };
struct module; struct pstore_info;
/**
* struct pstore_record - details of a pstore record entry
* @psi: pstore backend driver information
* @type: pstore record type
* @id: per-type unique identifier for record
* @time: timestamp of the record
* @count: for PSTORE_TYPE_DMESG, the Oops count.
* @compressed: for PSTORE_TYPE_DMESG, whether the buffer is compressed
* @buf: pointer to record contents
* @size: size of @buf
* @ecc_notice_size:
* ECC information for @buf
*/
struct pstore_record {
struct pstore_info *psi;
enum pstore_type_id type;
u64 id;
struct timespec time;
int count;
bool compressed;
char *buf;
ssize_t size;
ssize_t ecc_notice_size;
};
/** /**
* struct pstore_info - backend pstore driver structure * struct pstore_info - backend pstore driver structure