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authorLinus Torvalds <torvalds@linux-foundation.org>2020-03-15 12:42:03 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-03-15 12:42:03 -0700
commitb67775e124572a7028e930c306ed68cc2f90b29b (patch)
treef7031471854dd2bf99d707735ba72e0fddf3defa
parentde28a65cd0e39d031dfcdc61fbe06268cb4a5f94 (diff)
parentd6c066fda90d578aacdf19771a027ed484a79825 (diff)
downloadlinux-b67775e124572a7028e930c306ed68cc2f90b29b.tar.bz2
Merge tag 'efi-urgent-2020-03-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull EFI fixes from Thomas Gleixner: "Two EFI fixes: - Prevent a race and buffer overflow in the sysfs efivars interface which causes kernel memory corruption. - Add the missing NULL pointer checks in efivar_store_raw()" * tag 'efi-urgent-2020-03-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: efi: Add a sanity check to efivar_store_raw() efi: Fix a race and a buffer overflow while reading efivars via sysfs
-rw-r--r--drivers/firmware/efi/efivars.c32
1 files changed, 23 insertions, 9 deletions
diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
index 7576450c8254..aff3dfb4d7ba 100644
--- a/drivers/firmware/efi/efivars.c
+++ b/drivers/firmware/efi/efivars.c
@@ -83,13 +83,16 @@ static ssize_t
efivar_attr_read(struct efivar_entry *entry, char *buf)
{
struct efi_variable *var = &entry->var;
+ unsigned long size = sizeof(var->Data);
char *str = buf;
+ int ret;
if (!entry || !buf)
return -EINVAL;
- var->DataSize = 1024;
- if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
+ ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data);
+ var->DataSize = size;
+ if (ret)
return -EIO;
if (var->Attributes & EFI_VARIABLE_NON_VOLATILE)
@@ -116,13 +119,16 @@ static ssize_t
efivar_size_read(struct efivar_entry *entry, char *buf)
{
struct efi_variable *var = &entry->var;
+ unsigned long size = sizeof(var->Data);
char *str = buf;
+ int ret;
if (!entry || !buf)
return -EINVAL;
- var->DataSize = 1024;
- if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
+ ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data);
+ var->DataSize = size;
+ if (ret)
return -EIO;
str += sprintf(str, "0x%lx\n", var->DataSize);
@@ -133,12 +139,15 @@ static ssize_t
efivar_data_read(struct efivar_entry *entry, char *buf)
{
struct efi_variable *var = &entry->var;
+ unsigned long size = sizeof(var->Data);
+ int ret;
if (!entry || !buf)
return -EINVAL;
- var->DataSize = 1024;
- if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
+ ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data);
+ var->DataSize = size;
+ if (ret)
return -EIO;
memcpy(buf, var->Data, var->DataSize);
@@ -199,6 +208,9 @@ efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
u8 *data;
int err;
+ if (!entry || !buf)
+ return -EINVAL;
+
if (in_compat_syscall()) {
struct compat_efi_variable *compat;
@@ -250,14 +262,16 @@ efivar_show_raw(struct efivar_entry *entry, char *buf)
{
struct efi_variable *var = &entry->var;
struct compat_efi_variable *compat;
+ unsigned long datasize = sizeof(var->Data);
size_t size;
+ int ret;
if (!entry || !buf)
return 0;
- var->DataSize = 1024;
- if (efivar_entry_get(entry, &entry->var.Attributes,
- &entry->var.DataSize, entry->var.Data))
+ ret = efivar_entry_get(entry, &var->Attributes, &datasize, var->Data);
+ var->DataSize = datasize;
+ if (ret)
return -EIO;
if (in_compat_syscall()) {