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Diffstat (limited to 'arch/arm64/include/asm/processor.h')
-rw-r--r--arch/arm64/include/asm/processor.h47
1 files changed, 30 insertions, 17 deletions
diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
index fce604e3e599..767598932549 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -34,10 +34,12 @@
#ifdef __KERNEL__
+#include <linux/build_bug.h>
+#include <linux/stddef.h>
#include <linux/string.h>
#include <asm/alternative.h>
-#include <asm/fpsimd.h>
+#include <asm/cpufeature.h>
#include <asm/hw_breakpoint.h>
#include <asm/lse.h>
#include <asm/pgtable-hwdef.h>
@@ -103,11 +105,19 @@ struct cpu_context {
struct thread_struct {
struct cpu_context cpu_context; /* cpu context */
- unsigned long tp_value; /* TLS register */
-#ifdef CONFIG_COMPAT
- unsigned long tp2_value;
-#endif
- struct fpsimd_state fpsimd_state;
+
+ /*
+ * Whitelisted fields for hardened usercopy:
+ * Maintainers must ensure manually that this contains no
+ * implicit padding.
+ */
+ struct {
+ unsigned long tp_value; /* TLS register */
+ unsigned long tp2_value;
+ struct user_fpsimd_state fpsimd_state;
+ } uw;
+
+ unsigned int fpsimd_cpu;
void *sve_state; /* SVE registers, if any */
unsigned int sve_vl; /* SVE vector length */
unsigned int sve_vl_onexec; /* SVE vl after next exec */
@@ -116,14 +126,17 @@ struct thread_struct {
struct debug_info debug; /* debugging */
};
-/*
- * Everything usercopied to/from thread_struct is statically-sized, so
- * no hardened usercopy whitelist is needed.
- */
static inline void arch_thread_struct_whitelist(unsigned long *offset,
unsigned long *size)
{
- *offset = *size = 0;
+ /* Verify that there is no padding among the whitelisted fields: */
+ BUILD_BUG_ON(sizeof_field(struct thread_struct, uw) !=
+ sizeof_field(struct thread_struct, uw.tp_value) +
+ sizeof_field(struct thread_struct, uw.tp2_value) +
+ sizeof_field(struct thread_struct, uw.fpsimd_state));
+
+ *offset = offsetof(struct thread_struct, uw);
+ *size = sizeof_field(struct thread_struct, uw);
}
#ifdef CONFIG_COMPAT
@@ -131,13 +144,13 @@ static inline void arch_thread_struct_whitelist(unsigned long *offset,
({ \
unsigned long *__tls; \
if (is_compat_thread(task_thread_info(t))) \
- __tls = &(t)->thread.tp2_value; \
+ __tls = &(t)->thread.uw.tp2_value; \
else \
- __tls = &(t)->thread.tp_value; \
+ __tls = &(t)->thread.uw.tp_value; \
__tls; \
})
#else
-#define task_user_tls(t) (&(t)->thread.tp_value)
+#define task_user_tls(t) (&(t)->thread.uw.tp_value)
#endif
/* Sync TPIDR_EL0 back to thread_struct for current */
@@ -227,9 +240,9 @@ static inline void spin_lock_prefetch(const void *ptr)
#endif
-int cpu_enable_pan(void *__unused);
-int cpu_enable_cache_maint_trap(void *__unused);
-int cpu_clear_disr(void *__unused);
+void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused);
+void cpu_enable_cache_maint_trap(const struct arm64_cpu_capabilities *__unused);
+void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused);
/* Userspace interface for PR_SVE_{SET,GET}_VL prctl()s: */
#define SVE_SET_VL(arg) sve_set_current_vl(arg)