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* Avoid garbage names in efivarfs due to buggy firmware by zero'ing

Browse Source 
EFI variable name - Ross Lagerwall
 
  * Stop erroneously dropping upper 32-bits of boot command line pointer
    in EFI boot stub and stash them in ext_cmd_line_ptr - Roy Franz
 
  * Fix double-free bug in error handling code path of EFI runtime map
    code - Dan Carpenter
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Merge tag 'efi-urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/urgent

Pull EFI fixes from Matt Fleming:

 * Avoid garbage names in efivarfs due to buggy firmware by zeroing
   EFI variable name. (Ross Lagerwall)

 * Stop erroneously dropping upper 32 bits of boot command line pointer
   in EFI boot stub and stash them in ext_cmd_line_ptr. (Roy Franz)

 * Fix double-free bug in error handling code path of EFI runtime map
   code. (Dan Carpenter)

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2015-05-06 08:29:37 +02:00
commit c102cb097d
3 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/boot/compressed/eboot.c
View File

@ -1109,6 +1109,8 @@ struct boot_params *make_boot_params(struct efi_config *c)
if (!cmdline_ptr)
goto fail;
hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
/* Fill in upper bits of command line address, NOP on 32 bit */
boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
hdr->ramdisk_image = 0;
hdr->ramdisk_size = 0;

6
drivers/firmware/efi/runtime-map.c
View File

@ -120,7 +120,8 @@ add_sysfs_runtime_map_entry(struct kobject *kobj, int nr)
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry) {
kset_unregister(map_kset);
return entry;
map_kset = NULL;
return ERR_PTR(-ENOMEM);
}
memcpy(&entry->md, efi_runtime_map + nr * efi_memdesc_size,
@ -132,6 +133,7 @@ add_sysfs_runtime_map_entry(struct kobject *kobj, int nr)
if (ret) {
kobject_put(&entry->kobj);
kset_unregister(map_kset);
map_kset = NULL;
return ERR_PTR(ret);
}
@ -195,8 +197,6 @@ out_add_entry:
entry = *(map_entries + j);
kobject_put(&entry->kobj);
}
if (map_kset)
kset_unregister(map_kset);
out:
return ret;
}

2
fs/efivarfs/super.c
View File

@ -121,7 +121,7 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
int len, i;
int err = -ENOMEM;
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return err;