https://github.com/torvalds/linux
Revision 8c16ec94dc767a4d8c48149d646e8c835512cf8f authored by Linus Torvalds on 07 May 2020, 16:50:59 UTC, committed by Linus Torvalds on 07 May 2020, 16:50:59 UTC
Pull kvm fixes from Paolo Bonzini: "Bugfixes, mostly for ARM and AMD, and more documentation. Slightly bigger than usual because I couldn't send out what was pending for rc4, but there is nothing worrisome going on. I have more fixes pending for guest debugging support (gdbstub) but I will send them next week" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (22 commits) KVM: X86: Declare KVM_CAP_SET_GUEST_DEBUG properly KVM: selftests: Fix build for evmcs.h kvm: x86: Use KVM CPU capabilities to determine CR4 reserved bits KVM: VMX: Explicitly clear RFLAGS.CF and RFLAGS.ZF in VM-Exit RSB path docs/virt/kvm: Document configuring and running nested guests KVM: s390: Remove false WARN_ON_ONCE for the PQAP instruction kvm: ioapic: Restrict lazy EOI update to edge-triggered interrupts KVM: x86: Fixes posted interrupt check for IRQs delivery modes KVM: SVM: fill in kvm_run->debug.arch.dr[67] KVM: nVMX: Replace a BUG_ON(1) with BUG() to squash clang warning KVM: arm64: Fix 32bit PC wrap-around KVM: arm64: vgic-v4: Initialize GICv4.1 even in the absence of a virtual ITS KVM: arm64: Save/restore sp_el0 as part of __guest_enter KVM: arm64: Delete duplicated label in invalid_vector KVM: arm64: vgic-its: Fix memory leak on the error path of vgic_add_lpi() KVM: arm64: vgic-v3: Retire all pending LPIs on vcpu destroy KVM: arm: vgic-v2: Only use the virtual state when userspace accesses pending bits KVM: arm: vgic: Only use the virtual state when userspace accesses enable bits KVM: arm: vgic: Synchronize the whole guest on GIC{D,R}_I{S,C}ACTIVER read KVM: arm64: PSCI: Forbid 64bit functions for 32bit guests ...
Tip revision: 8c16ec94dc767a4d8c48149d646e8c835512cf8f authored by Linus Torvalds on 07 May 2020, 16:50:59 UTC
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Tip revision: 8c16ec9
blacklist.c
// SPDX-License-Identifier: GPL-2.0-or-later
/* System hash blacklist.
*
* Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#define pr_fmt(fmt) "blacklist: "fmt
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/key.h>
#include <linux/key-type.h>
#include <linux/sched.h>
#include <linux/ctype.h>
#include <linux/err.h>
#include <linux/seq_file.h>
#include <keys/system_keyring.h>
#include "blacklist.h"
static struct key *blacklist_keyring;
/*
* The description must be a type prefix, a colon and then an even number of
* hex digits. The hash is kept in the description.
*/
static int blacklist_vet_description(const char *desc)
{
int n = 0;
if (*desc == ':')
return -EINVAL;
for (; *desc; desc++)
if (*desc == ':')
goto found_colon;
return -EINVAL;
found_colon:
desc++;
for (; *desc; desc++) {
if (!isxdigit(*desc))
return -EINVAL;
n++;
}
if (n == 0 || n & 1)
return -EINVAL;
return 0;
}
/*
* The hash to be blacklisted is expected to be in the description. There will
* be no payload.
*/
static int blacklist_preparse(struct key_preparsed_payload *prep)
{
if (prep->datalen > 0)
return -EINVAL;
return 0;
}
static void blacklist_free_preparse(struct key_preparsed_payload *prep)
{
}
static void blacklist_describe(const struct key *key, struct seq_file *m)
{
seq_puts(m, key->description);
}
static struct key_type key_type_blacklist = {
.name = "blacklist",
.vet_description = blacklist_vet_description,
.preparse = blacklist_preparse,
.free_preparse = blacklist_free_preparse,
.instantiate = generic_key_instantiate,
.describe = blacklist_describe,
};
/**
* mark_hash_blacklisted - Add a hash to the system blacklist
* @hash - The hash as a hex string with a type prefix (eg. "tbs:23aa429783")
*/
int mark_hash_blacklisted(const char *hash)
{
key_ref_t key;
key = key_create_or_update(make_key_ref(blacklist_keyring, true),
"blacklist",
hash,
NULL,
0,
((KEY_POS_ALL & ~KEY_POS_SETATTR) |
KEY_USR_VIEW),
KEY_ALLOC_NOT_IN_QUOTA |
KEY_ALLOC_BUILT_IN);
if (IS_ERR(key)) {
pr_err("Problem blacklisting hash (%ld)\n", PTR_ERR(key));
return PTR_ERR(key);
}
return 0;
}
/**
* is_hash_blacklisted - Determine if a hash is blacklisted
* @hash: The hash to be checked as a binary blob
* @hash_len: The length of the binary hash
* @type: Type of hash
*/
int is_hash_blacklisted(const u8 *hash, size_t hash_len, const char *type)
{
key_ref_t kref;
size_t type_len = strlen(type);
char *buffer, *p;
int ret = 0;
buffer = kmalloc(type_len + 1 + hash_len * 2 + 1, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
p = memcpy(buffer, type, type_len);
p += type_len;
*p++ = ':';
bin2hex(p, hash, hash_len);
p += hash_len * 2;
*p = 0;
kref = keyring_search(make_key_ref(blacklist_keyring, true),
&key_type_blacklist, buffer, false);
if (!IS_ERR(kref)) {
key_ref_put(kref);
ret = -EKEYREJECTED;
}
kfree(buffer);
return ret;
}
EXPORT_SYMBOL_GPL(is_hash_blacklisted);
int is_binary_blacklisted(const u8 *hash, size_t hash_len)
{
if (is_hash_blacklisted(hash, hash_len, "bin") == -EKEYREJECTED)
return -EPERM;
return 0;
}
EXPORT_SYMBOL_GPL(is_binary_blacklisted);
/*
* Initialise the blacklist
*/
static int __init blacklist_init(void)
{
const char *const *bl;
if (register_key_type(&key_type_blacklist) < 0)
panic("Can't allocate system blacklist key type\n");
blacklist_keyring =
keyring_alloc(".blacklist",
KUIDT_INIT(0), KGIDT_INIT(0),
current_cred(),
(KEY_POS_ALL & ~KEY_POS_SETATTR) |
KEY_USR_VIEW | KEY_USR_READ |
KEY_USR_SEARCH,
KEY_ALLOC_NOT_IN_QUOTA |
KEY_FLAG_KEEP,
NULL, NULL);
if (IS_ERR(blacklist_keyring))
panic("Can't allocate system blacklist keyring\n");
for (bl = blacklist_hashes; *bl; bl++)
if (mark_hash_blacklisted(*bl) < 0)
pr_err("- blacklisting failed\n");
return 0;
}
/*
* Must be initialised before we try and load the keys into the keyring.
*/
device_initcall(blacklist_init);
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