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authorPeter Jones <pjones@redhat.com>2016-02-08 14:48:15 -0500
committerMatt Fleming <matt@codeblueprint.co.uk>2016-02-10 16:25:52 +0000
commited8b0de5a33d2a2557dce7f9429dca8cb5bc5879 (patch)
tree1dcd2e49cc432ae312677ec47453ec3abc18f1d2 /fs/efivarfs/super.c
parent8282f5d9c17fe15a9e658c06e3f343efae1a2a2f (diff)
efi: Make efivarfs entries immutable by default
"rm -rf" is bricking some peoples' laptops because of variables being used to store non-reinitializable firmware driver data that's required to POST the hardware. These are 100% bugs, and they need to be fixed, but in the mean time it shouldn't be easy to *accidentally* brick machines. We have to have delete working, and picking which variables do and don't work for deletion is quite intractable, so instead make everything immutable by default (except for a whitelist), and make tools that aren't quite so broad-spectrum unset the immutable flag. Signed-off-by: Peter Jones <pjones@redhat.com> Tested-by: Lee, Chun-Yi <jlee@suse.com> Acked-by: Matthew Garrett <mjg59@coreos.com> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Diffstat (limited to 'fs/efivarfs/super.c')
-rw-r--r--fs/efivarfs/super.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c
index 8651ac28ec0d..dd029d13ea61 100644
--- a/fs/efivarfs/super.c
+++ b/fs/efivarfs/super.c
@@ -120,6 +120,7 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
char *name;
int len;
int err = -ENOMEM;
+ bool is_removable = false;
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
@@ -137,13 +138,17 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
ucs2_as_utf8(name, entry->var.VariableName, len);
+ if (efivar_variable_is_removable(entry->var.VendorGuid, name, len))
+ is_removable = true;
+
name[len] = '-';
efi_guid_to_str(&entry->var.VendorGuid, name + len + 1);
name[len + EFI_VARIABLE_GUID_LEN+1] = '\0';
- inode = efivarfs_get_inode(sb, d_inode(root), S_IFREG | 0644, 0);
+ inode = efivarfs_get_inode(sb, d_inode(root), S_IFREG | 0644, 0,
+ is_removable);
if (!inode)
goto fail_name;
@@ -199,7 +204,7 @@ static int efivarfs_fill_super(struct super_block *sb, void *data, int silent)
sb->s_d_op = &efivarfs_d_ops;
sb->s_time_gran = 1;
- inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0);
+ inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0, true);
if (!inode)
return -ENOMEM;
inode->i_op = &efivarfs_dir_inode_operations;