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authorSeiji Aguchi <seiji.aguchi@hds.com>2012-11-14 21:29:21 +0100
committerTony Luck <tony.luck@intel.com>2012-11-27 01:08:37 +0100
commitf94ec0c0594ef73ab3a2f1f32735aca8ddaf65e2 (patch)
tree476e4615eb15c6a08d2511802fdcd35418a1896d /drivers/firmware/efivars.c
parentefi_pstore: Add a format check for an existing variable name at reading time (diff)
downloadlinux-f94ec0c0594ef73ab3a2f1f32735aca8ddaf65e2.tar.xz
linux-f94ec0c0594ef73ab3a2f1f32735aca8ddaf65e2.zip
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@hds.com> Acked-by: Mike Waychison <mikew@google.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'drivers/firmware/efivars.c')
-rw-r--r--drivers/firmware/efivars.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index bf7a6f994a3c..6e51c1e81f14 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;