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arm64: rename ptrauth key structures to be user-specific

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We currently enable ptrauth for userspace, but do not use it within the
kernel. We're going to enable it for the kernel, and will need to manage
a separate set of ptrauth keys for the kernel.

We currently keep all 5 keys in struct ptrauth_keys. However, as the
kernel will only need to use 1 key, it is a bit wasteful to allocate a
whole ptrauth_keys struct for every thread.

Therefore, a subsequent patch will define a separate struct, with only 1
key, for the kernel. In preparation for that, rename the existing struct
(and associated macros and functions) to reflect that they are specific
to userspace.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Vincenzo Frascino <Vincenzo.Frascino@arm.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
[Amit: Re-positioned the patch to reduce the diff]
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Kristina Martsenko 2020-03-13 14:34:50 +05:30 committed by Catalin Marinas
parent cfef06bd06
commit 91a1b6ccff
4 changed files with 19 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/arm64/include/asm/pointer_auth.h
View File

@ -22,7 +22,7 @@ struct ptrauth_key {
* We give each process its own keys, which are shared by all threads. The keys
* are inherited upon fork(), and reinitialised upon exec*().
*/
struct ptrauth_keys {
struct ptrauth_keys_user {
struct ptrauth_key apia;
struct ptrauth_key apib;
struct ptrauth_key apda;
@ -30,7 +30,7 @@ struct ptrauth_keys {
struct ptrauth_key apga;
};
static inline void ptrauth_keys_init(struct ptrauth_keys *keys)
static inline void ptrauth_keys_init_user(struct ptrauth_keys_user *keys)
{
if (system_supports_address_auth()) {
get_random_bytes(&keys->apia, sizeof(keys->apia));
@ -50,7 +50,7 @@ do { \
write_sysreg_s(__pki_v.hi, SYS_ ## k ## KEYHI_EL1); \
} while (0)
static inline void ptrauth_keys_switch(struct ptrauth_keys *keys)
static inline void ptrauth_keys_switch_user(struct ptrauth_keys_user *keys)
{
if (system_supports_address_auth()) {
__ptrauth_key_install(APIA, keys->apia);
@ -80,12 +80,12 @@ static inline unsigned long ptrauth_strip_insn_pac(unsigned long ptr)
#define ptrauth_thread_init_user(tsk) \
do { \
struct task_struct *__ptiu_tsk = (tsk); \
ptrauth_keys_init(&__ptiu_tsk->thread.keys_user); \
ptrauth_keys_switch(&__ptiu_tsk->thread.keys_user); \
ptrauth_keys_init_user(&__ptiu_tsk->thread.keys_user); \
ptrauth_keys_switch_user(&__ptiu_tsk->thread.keys_user); \
} while (0)
#define ptrauth_thread_switch(tsk) \
ptrauth_keys_switch(&(tsk)->thread.keys_user)
ptrauth_keys_switch_user(&(tsk)->thread.keys_user)
#else /* CONFIG_ARM64_PTR_AUTH */
#define ptrauth_prctl_reset_keys(tsk, arg) (-EINVAL)

2
arch/arm64/include/asm/processor.h
View File

@ -146,7 +146,7 @@ struct thread_struct {
unsigned long fault_code; /* ESR_EL1 value */
struct debug_info debug; /* debugging */
#ifdef CONFIG_ARM64_PTR_AUTH
struct ptrauth_keys keys_user;
struct ptrauth_keys_user keys_user;
#endif
};

8
arch/arm64/kernel/pointer_auth.c
View File

@ -9,7 +9,7 @@
int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg)
{
struct ptrauth_keys *keys = &tsk->thread.keys_user;
struct ptrauth_keys_user *keys = &tsk->thread.keys_user;
unsigned long addr_key_mask = PR_PAC_APIAKEY | PR_PAC_APIBKEY |
PR_PAC_APDAKEY | PR_PAC_APDBKEY;
unsigned long key_mask = addr_key_mask | PR_PAC_APGAKEY;
@ -18,8 +18,8 @@ int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg)
return -EINVAL;
if (!arg) {
ptrauth_keys_init(keys);
ptrauth_keys_switch(keys);
ptrauth_keys_init_user(keys);
ptrauth_keys_switch_user(keys);
return 0;
}
@ -41,7 +41,7 @@ int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg)
if (arg & PR_PAC_APGAKEY)
get_random_bytes(&keys->apga, sizeof(keys->apga));
ptrauth_keys_switch(keys);
ptrauth_keys_switch_user(keys);
return 0;
}

16
arch/arm64/kernel/ptrace.c
View File

@ -999,7 +999,7 @@ static struct ptrauth_key pac_key_from_user(__uint128_t ukey)
}
static void pac_address_keys_to_user(struct user_pac_address_keys *ukeys,
const struct ptrauth_keys *keys)
const struct ptrauth_keys_user *keys)
{
ukeys->apiakey = pac_key_to_user(&keys->apia);
ukeys->apibkey = pac_key_to_user(&keys->apib);
@ -1007,7 +1007,7 @@ static void pac_address_keys_to_user(struct user_pac_address_keys *ukeys,
ukeys->apdbkey = pac_key_to_user(&keys->apdb);
}
static void pac_address_keys_from_user(struct ptrauth_keys *keys,
static void pac_address_keys_from_user(struct ptrauth_keys_user *keys,
const struct user_pac_address_keys *ukeys)
{
keys->apia = pac_key_from_user(ukeys->apiakey);
@ -1021,7 +1021,7 @@ static int pac_address_keys_get(struct task_struct *target,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
struct ptrauth_keys *keys = &target->thread.keys_user;
struct ptrauth_keys_user *keys = &target->thread.keys_user;
struct user_pac_address_keys user_keys;
if (!system_supports_address_auth())
@ -1038,7 +1038,7 @@ static int pac_address_keys_set(struct task_struct *target,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct ptrauth_keys *keys = &target->thread.keys_user;
struct ptrauth_keys_user *keys = &target->thread.keys_user;
struct user_pac_address_keys user_keys;
int ret;
@ -1056,12 +1056,12 @@ static int pac_address_keys_set(struct task_struct *target,
}
static void pac_generic_keys_to_user(struct user_pac_generic_keys *ukeys,
const struct ptrauth_keys *keys)
const struct ptrauth_keys_user *keys)
{
ukeys->apgakey = pac_key_to_user(&keys->apga);
}
static void pac_generic_keys_from_user(struct ptrauth_keys *keys,
static void pac_generic_keys_from_user(struct ptrauth_keys_user *keys,
const struct user_pac_generic_keys *ukeys)
{
keys->apga = pac_key_from_user(ukeys->apgakey);
@ -1072,7 +1072,7 @@ static int pac_generic_keys_get(struct task_struct *target,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
struct ptrauth_keys *keys = &target->thread.keys_user;
struct ptrauth_keys_user *keys = &target->thread.keys_user;
struct user_pac_generic_keys user_keys;
if (!system_supports_generic_auth())
@ -1089,7 +1089,7 @@ static int pac_generic_keys_set(struct task_struct *target,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct ptrauth_keys *keys = &target->thread.keys_user;
struct ptrauth_keys_user *keys = &target->thread.keys_user;
struct user_pac_generic_keys user_keys;
int ret;