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-rw-r--r--arch/powerpc/kernel/nvram_64.c14
-rw-r--r--drivers/firmware/efi/efi-pstore.c87
-rw-r--r--fs/pstore/inode.c22
-rw-r--r--fs/pstore/internal.h2
-rw-r--r--fs/pstore/platform.c69
-rw-r--r--fs/pstore/pmsg.c10
-rw-r--r--fs/pstore/ram.c16
-rw-r--r--include/linux/pstore.h5
8 files changed, 114 insertions, 111 deletions
diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
index eae61b044e9e..496d6393bd41 100644
--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -792,21 +792,17 @@ static ssize_t dev_nvram_write(struct file *file, const char __user *buf,
count = min_t(size_t, count, size - *ppos);
count = min(count, PAGE_SIZE);
- ret = -ENOMEM;
- tmp = kmalloc(count, GFP_KERNEL);
- if (!tmp)
- goto out;
-
- ret = -EFAULT;
- if (copy_from_user(tmp, buf, count))
+ tmp = memdup_user(buf, count);
+ if (IS_ERR(tmp)) {
+ ret = PTR_ERR(tmp);
goto out;
+ }
ret = ppc_md.nvram_write(tmp, count, ppos);
-out:
kfree(tmp);
+out:
return ret;
-
}
static long dev_nvram_ioctl(struct file *file, unsigned int cmd,
diff --git a/drivers/firmware/efi/efi-pstore.c b/drivers/firmware/efi/efi-pstore.c
index ef1fafdad400..5a0fa939d70f 100644
--- a/drivers/firmware/efi/efi-pstore.c
+++ b/drivers/firmware/efi/efi-pstore.c
@@ -4,7 +4,7 @@
#include <linux/slab.h>
#include <linux/ucs2_string.h>
-#define DUMP_NAME_LEN 52
+#define DUMP_NAME_LEN 66
static bool efivars_pstore_disable =
IS_ENABLED(CONFIG_EFI_VARS_PSTORE_DEFAULT_DISABLE);
@@ -244,12 +244,12 @@ 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);
+ /* Since we copy the entire length of name, make sure it is wiped. */
+ memset(name, 0, sizeof(name));
+
snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lu-%c",
record->type, record->part, record->count,
record->time.tv_sec, record->compressed ? 'C' : 'D');
@@ -267,44 +267,20 @@ static int efi_pstore_write(struct pstore_record *record)
return ret;
};
-struct pstore_erase_data {
- struct pstore_record *record;
- efi_char16_t *name;
-};
-
/*
* Clean up an entry with the same name
*/
static int efi_pstore_erase_func(struct efivar_entry *entry, void *data)
{
- struct pstore_erase_data *ed = data;
+ efi_char16_t *efi_name = data;
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
- efi_char16_t efi_name_old[DUMP_NAME_LEN];
- efi_char16_t *efi_name = ed->name;
- unsigned long ucs2_len = ucs2_strlen(ed->name);
- char name_old[DUMP_NAME_LEN];
- int i;
+ unsigned long ucs2_len = ucs2_strlen(efi_name);
if (efi_guidcmp(entry->var.VendorGuid, vendor))
return 0;
- if (ucs2_strncmp(entry->var.VariableName,
- efi_name, (size_t)ucs2_len)) {
- /*
- * Check if an old format, which doesn't support
- * holding multiple logs, remains.
- */
- snprintf(name_old, sizeof(name_old), "dump-type%u-%u-%lu",
- ed->record->type, ed->record->part,
- ed->record->time.tv_sec);
-
- for (i = 0; i < DUMP_NAME_LEN; i++)
- efi_name_old[i] = name_old[i];
-
- if (ucs2_strncmp(entry->var.VariableName, efi_name_old,
- ucs2_strlen(efi_name_old)))
- return 0;
- }
+ if (ucs2_strncmp(entry->var.VariableName, efi_name, (size_t)ucs2_len))
+ return 0;
if (entry->scanning) {
/*
@@ -321,35 +297,48 @@ static int efi_pstore_erase_func(struct efivar_entry *entry, void *data)
return 1;
}
-static int efi_pstore_erase(struct pstore_record *record)
+static int efi_pstore_erase_name(const char *name)
{
- struct pstore_erase_data edata;
struct efivar_entry *entry = NULL;
- char name[DUMP_NAME_LEN];
efi_char16_t efi_name[DUMP_NAME_LEN];
int found, i;
- snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lu",
- record->type, record->part, record->count,
- record->time.tv_sec);
-
- for (i = 0; i < DUMP_NAME_LEN; i++)
+ for (i = 0; i < DUMP_NAME_LEN; i++) {
efi_name[i] = name[i];
-
- edata.record = record;
- edata.name = efi_name;
+ if (name[i] == '\0')
+ break;
+ }
if (efivar_entry_iter_begin())
return -EINTR;
- found = __efivar_entry_iter(efi_pstore_erase_func, &efivar_sysfs_list, &edata, &entry);
- if (found && !entry->scanning) {
- efivar_entry_iter_end();
+ found = __efivar_entry_iter(efi_pstore_erase_func, &efivar_sysfs_list,
+ efi_name, &entry);
+ efivar_entry_iter_end();
+
+ if (found && !entry->scanning)
efivar_unregister(entry);
- } else
- efivar_entry_iter_end();
- return 0;
+ return found ? 0 : -ENOENT;
+}
+
+static int efi_pstore_erase(struct pstore_record *record)
+{
+ char name[DUMP_NAME_LEN];
+ int ret;
+
+ snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lu",
+ record->type, record->part, record->count,
+ record->time.tv_sec);
+ ret = efi_pstore_erase_name(name);
+ if (ret != -ENOENT)
+ return ret;
+
+ snprintf(name, sizeof(name), "dump-type%u-%u-%lu",
+ record->type, record->part, record->time.tv_sec);
+ ret = efi_pstore_erase_name(name);
+
+ return ret;
}
static struct pstore_info efi_pstore_info = {
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 792a4e5f9226..4d02c3b65061 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -349,48 +349,48 @@ int pstore_mkfile(struct dentry *root, struct pstore_record *record)
switch (record->type) {
case PSTORE_TYPE_DMESG:
- scnprintf(name, sizeof(name), "dmesg-%s-%lld%s",
+ scnprintf(name, sizeof(name), "dmesg-%s-%llu%s",
record->psi->name, record->id,
record->compressed ? ".enc.z" : "");
break;
case PSTORE_TYPE_CONSOLE:
- scnprintf(name, sizeof(name), "console-%s-%lld",
+ scnprintf(name, sizeof(name), "console-%s-%llu",
record->psi->name, record->id);
break;
case PSTORE_TYPE_FTRACE:
- scnprintf(name, sizeof(name), "ftrace-%s-%lld",
+ scnprintf(name, sizeof(name), "ftrace-%s-%llu",
record->psi->name, record->id);
break;
case PSTORE_TYPE_MCE:
- scnprintf(name, sizeof(name), "mce-%s-%lld",
+ scnprintf(name, sizeof(name), "mce-%s-%llu",
record->psi->name, record->id);
break;
case PSTORE_TYPE_PPC_RTAS:
- scnprintf(name, sizeof(name), "rtas-%s-%lld",
+ scnprintf(name, sizeof(name), "rtas-%s-%llu",
record->psi->name, record->id);
break;
case PSTORE_TYPE_PPC_OF:
- scnprintf(name, sizeof(name), "powerpc-ofw-%s-%lld",
+ scnprintf(name, sizeof(name), "powerpc-ofw-%s-%llu",
record->psi->name, record->id);
break;
case PSTORE_TYPE_PPC_COMMON:
- scnprintf(name, sizeof(name), "powerpc-common-%s-%lld",
+ scnprintf(name, sizeof(name), "powerpc-common-%s-%llu",
record->psi->name, record->id);
break;
case PSTORE_TYPE_PMSG:
- scnprintf(name, sizeof(name), "pmsg-%s-%lld",
+ scnprintf(name, sizeof(name), "pmsg-%s-%llu",
record->psi->name, record->id);
break;
case PSTORE_TYPE_PPC_OPAL:
- scnprintf(name, sizeof(name), "powerpc-opal-%s-%lld",
+ scnprintf(name, sizeof(name), "powerpc-opal-%s-%llu",
record->psi->name, record->id);
break;
case PSTORE_TYPE_UNKNOWN:
- scnprintf(name, sizeof(name), "unknown-%s-%lld",
+ scnprintf(name, sizeof(name), "unknown-%s-%llu",
record->psi->name, record->id);
break;
default:
- scnprintf(name, sizeof(name), "type%d-%s-%lld",
+ scnprintf(name, sizeof(name), "type%d-%s-%llu",
record->type, record->psi->name, record->id);
break;
}
diff --git a/fs/pstore/internal.h b/fs/pstore/internal.h
index c416e653dc4f..58051265626f 100644
--- a/fs/pstore/internal.h
+++ b/fs/pstore/internal.h
@@ -30,5 +30,7 @@ extern void pstore_get_backend_records(struct pstore_info *psi,
extern int pstore_mkfile(struct dentry *root,
struct pstore_record *record);
extern bool pstore_is_mounted(void);
+extern void pstore_record_init(struct pstore_record *record,
+ struct pstore_info *psi);
#endif
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index d468eec9b8a6..1b6e0ff6bff5 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -474,6 +474,20 @@ static size_t copy_kmsg_to_buffer(int hsize, size_t len)
return total_len;
}
+void pstore_record_init(struct pstore_record *record,
+ struct pstore_info *psinfo)
+{
+ memset(record, 0, sizeof(*record));
+
+ record->psi = psinfo;
+
+ /* Report zeroed timestamp if called before timekeeping has resumed. */
+ if (__getnstimeofday(&record->time)) {
+ record->time.tv_sec = 0;
+ record->time.tv_nsec = 0;
+ }
+}
+
/*
* callback from kmsg_dump. (s2,l2) has the most recently
* written bytes, older bytes are in (s1,l1). Save as much
@@ -509,15 +523,14 @@ static void pstore_dump(struct kmsg_dumper *dumper,
int header_size;
int zipped_len = -1;
size_t dump_size;
- struct pstore_record record = {
- .type = PSTORE_TYPE_DMESG,
- .count = oopscount,
- .reason = reason,
- .part = part,
- .compressed = false,
- .buf = psinfo->buf,
- .psi = psinfo,
- };
+ struct pstore_record record;
+
+ pstore_record_init(&record, psinfo);
+ record.type = PSTORE_TYPE_DMESG;
+ record.count = oopscount;
+ record.reason = reason;
+ record.part = part;
+ record.buf = psinfo->buf;
if (big_oops_buf && is_locked) {
dst = big_oops_buf;
@@ -587,12 +600,12 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c)
const char *e = s + c;
while (s < e) {
- struct pstore_record record = {
- .type = PSTORE_TYPE_CONSOLE,
- .psi = psinfo,
- };
+ struct pstore_record record;
unsigned long flags;
+ pstore_record_init(&record, psinfo);
+ record.type = PSTORE_TYPE_CONSOLE;
+
if (c > psinfo->bufsize)
c = psinfo->bufsize;
@@ -640,19 +653,16 @@ static int pstore_write_user_compat(struct pstore_record *record,
if (record->buf)
return -EINVAL;
- record->buf = kmalloc(record->size, GFP_KERNEL);
- if (!record->buf)
- return -ENOMEM;
-
- if (unlikely(copy_from_user(record->buf, buf, record->size))) {
- ret = -EFAULT;
+ record->buf = memdup_user(buf, record->size);
+ if (unlikely(IS_ERR(record->buf))) {
+ ret = PTR_ERR(record->buf);
goto out;
}
ret = record->psi->write(record);
-out:
kfree(record->buf);
+out:
record->buf = NULL;
return unlikely(ret < 0) ? ret : record->size;
@@ -770,8 +780,11 @@ static void decompress_record(struct pstore_record *record)
int unzipped_len;
char *decompressed;
+ if (!record->compressed)
+ return;
+
/* Only PSTORE_TYPE_DMESG support compression. */
- if (!record->compressed || record->type != PSTORE_TYPE_DMESG) {
+ if (record->type != PSTORE_TYPE_DMESG) {
pr_warn("ignored compressed record type %d\n", record->type);
return;
}
@@ -819,6 +832,7 @@ void pstore_get_backend_records(struct pstore_info *psi,
struct dentry *root, int quiet)
{
int failed = 0;
+ unsigned int stop_loop = 65536;
if (!psi || !root)
return;
@@ -832,7 +846,7 @@ void pstore_get_backend_records(struct pstore_info *psi,
* may reallocate record.buf. On success, pstore_mkfile() will keep
* the record.buf, so free it only on failure.
*/
- for (;;) {
+ for (; stop_loop; stop_loop--) {
struct pstore_record *record;
int rc;
@@ -841,13 +855,15 @@ void pstore_get_backend_records(struct pstore_info *psi,
pr_err("out of memory creating record\n");
break;
}
- record->psi = psi;
+ pstore_record_init(record, psi);
record->size = psi->read(record);
/* No more records left in backend? */
- if (record->size <= 0)
+ if (record->size <= 0) {
+ kfree(record);
break;
+ }
decompress_record(record);
rc = pstore_mkfile(root, record);
@@ -865,8 +881,11 @@ out:
mutex_unlock(&psi->read_mutex);
if (failed)
- pr_warn("failed to load %d record(s) from '%s'\n",
+ pr_warn("failed to create %d record(s) from '%s'\n",
failed, psi->name);
+ if (!stop_loop)
+ pr_err("looping? Too many records seen from '%s'\n",
+ psi->name);
}
static void pstore_dowork(struct work_struct *work)
diff --git a/fs/pstore/pmsg.c b/fs/pstore/pmsg.c
index 209755e0d7c8..24db02de1787 100644
--- a/fs/pstore/pmsg.c
+++ b/fs/pstore/pmsg.c
@@ -22,16 +22,16 @@ static DEFINE_MUTEX(pmsg_lock);
static ssize_t write_pmsg(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- struct pstore_record record = {
- .type = PSTORE_TYPE_PMSG,
- .size = count,
- .psi = psinfo,
- };
+ struct pstore_record record;
int ret;
if (!count)
return 0;
+ pstore_record_init(&record, psinfo);
+ record.type = PSTORE_TYPE_PMSG;
+ record.size = count;
+
/* check outside lock, page in any data. write_user also checks */
if (!access_ok(VERIFY_READ, buf, count))
return -EFAULT;
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 5cb022c8cd33..7125b398d312 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -27,7 +27,6 @@
#include <linux/module.h>
#include <linux/version.h>
#include <linux/pstore.h>
-#include <linux/time.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
@@ -356,20 +355,15 @@ out:
}
static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
- bool compressed)
+ struct pstore_record *record)
{
char *hdr;
- struct timespec timestamp;
size_t len;
- /* Report zeroed timestamp if called before timekeeping has resumed. */
- if (__getnstimeofday(&timestamp)) {
- timestamp.tv_sec = 0;
- timestamp.tv_nsec = 0;
- }
hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
- (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000),
- compressed ? 'C' : 'D');
+ record->time.tv_sec,
+ record->time.tv_nsec / 1000,
+ record->compressed ? 'C' : 'D');
WARN_ON_ONCE(!hdr);
len = hdr ? strlen(hdr) : 0;
persistent_ram_write(prz, hdr, len);
@@ -440,7 +434,7 @@ static int notrace ramoops_pstore_write(struct pstore_record *record)
prz = cxt->dprzs[cxt->dump_write_cnt];
/* Build header and append record contents. */
- hlen = ramoops_write_kmsg_hdr(prz, record->compressed);
+ hlen = ramoops_write_kmsg_hdr(prz, record);
size = record->size;
if (size + hlen > prz->buffer_size)
size = prz->buffer_size - hlen;
diff --git a/include/linux/pstore.h b/include/linux/pstore.h
index e2233f50f428..61f806a7fe29 100644
--- a/include/linux/pstore.h
+++ b/include/linux/pstore.h
@@ -138,7 +138,10 @@ struct pstore_record {
* memory allocation may be broken during an Oops. Regardless,
* @buf must be proccesed or copied before returning. The
* backend is also expected to write @id with something that
- 8 can help identify this record to a future @erase callback.
+ * can help identify this record to a future @erase callback.
+ * The @time field will be prepopulated with the current time,
+ * when available. The @size field will have the size of data
+ * in @buf.
*
* Returns 0 on success, and non-zero on error.
*
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 01:07:30 +0000