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Message-ID: <A5ED84D3BB3A384992CBB9C77DEDA4D4138B1E8C@USINDEM103.corp.hds.com>
Date: Tue, 30 Oct 2012 20:04:14 +0000
From: Seiji Aguchi <seiji.aguchi@....com>
To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
"Luck, Tony (tony.luck@...el.com)" <tony.luck@...el.com>,
"Matthew Garrett (mjg@...hat.com)" <mjg@...hat.com>,
"dzickus@...hat.com" <dzickus@...hat.com>
CC: "dle-develop@...ts.sourceforge.net"
<dle-develop@...ts.sourceforge.net>,
Satoru Moriya <satoru.moriya@....com>
Subject: [PATCH v4 7/7] efi_pstore: Add a format check for an existing
variable name at erasing time
[Issue]
a format of variable name has been updated to type, id, count and ctime
to support holding multiple logs.
Format of current variable name
dump-type0-1-2-12345678
type:0
id:1
count:2
ctime:12345678
On the other hand, if an old variable name before being updated
remains, users can't erase it via /dev/pstore.
Format of old variable name
dump-type0-1-12345678
type:0
id:1
ctime:12345678
[Solution]
This patch add a format check for the old variable name in a erase callback to make it erasable.
Signed-off-by: Seiji Aguchi <seiji.aguchi@....com>
---
drivers/firmware/efivars.c | 20 ++++++++++++++++++--
1 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index bf7a6f9..6e51c1e 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -773,6 +773,8 @@ static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
{
char name[DUMP_NAME_LEN];
efi_char16_t efi_name[DUMP_NAME_LEN];
+ char name_old[DUMP_NAME_LEN];
+ efi_char16_t efi_name_old[DUMP_NAME_LEN];
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
struct efivars *efivars = psi->data;
struct efivar_entry *entry, *found = NULL;
@@ -796,8 +798,22 @@ static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
if (efi_guidcmp(entry->var.VendorGuid, vendor))
continue;
if (utf16_strncmp(entry->var.VariableName, efi_name,
- utf16_strlen(efi_name)))
- continue;
+ utf16_strlen(efi_name))) {
+ /*
+ * Check if an old format,
+ * which doesn't support holding
+ * multiple logs, remains.
+ */
+ sprintf(name_old, "dump-type%u-%u-%lu", type,
+ (unsigned int)id, time.tv_sec);
+
+ for (i = 0; i < DUMP_NAME_LEN; i++)
+ efi_name_old[i] = name_old[i];
+
+ if (utf16_strncmp(entry->var.VariableName, efi_name_old,
+ utf16_strlen(efi_name_old)))
+ continue;
+ }
/* found */
found = entry;
--
1.7.1
--
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