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authorLinus Torvalds <torvalds@linux-foundation.org>2020-04-24 21:34:43 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-24 21:34:43 +0300
commit4544db3f848f1d5d0f48d39c22c9636aecf73cf6 (patch)
treec0fec7492370d696c1558796304bd008e102990c /arch
parentb9916af776013051a34ccf47bc5e13acffef16c3 (diff)
parent59bff30ad6cec6b5babc8132eb8dcb48f1c82be0 (diff)
downloadlinux-4544db3f848f1d5d0f48d39c22c9636aecf73cf6.tar.xz
Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fixes from Catalin Marinas: - Ensure context synchronisation after a write to APIAKey. - Fix bullet list formatting in Documentation/arm64/amu.rst to eliminate doc warnings. * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: Documentation: arm64: fix amu.rst doc warnings arm64: sync kernel APIAKey when installing
Diffstat (limited to 'arch')
-rw-r--r--arch/arm64/include/asm/pointer_auth.h9
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/arm64/include/asm/pointer_auth.h b/arch/arm64/include/asm/pointer_auth.h
index 70c47156e54b..c6b4f0603024 100644
--- a/arch/arm64/include/asm/pointer_auth.h
+++ b/arch/arm64/include/asm/pointer_auth.h
@@ -47,7 +47,7 @@ static inline void ptrauth_keys_init_user(struct ptrauth_keys_user *keys)
get_random_bytes(&keys->apga, sizeof(keys->apga));
}
-#define __ptrauth_key_install(k, v) \
+#define __ptrauth_key_install_nosync(k, v) \
do { \
struct ptrauth_key __pki_v = (v); \
write_sysreg_s(__pki_v.lo, SYS_ ## k ## KEYLO_EL1); \
@@ -62,8 +62,11 @@ static __always_inline void ptrauth_keys_init_kernel(struct ptrauth_keys_kernel
static __always_inline void ptrauth_keys_switch_kernel(struct ptrauth_keys_kernel *keys)
{
- if (system_supports_address_auth())
- __ptrauth_key_install(APIA, keys->apia);
+ if (!system_supports_address_auth())
+ return;
+
+ __ptrauth_key_install_nosync(APIA, keys->apia);
+ isb();
}
extern int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg);