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-rw-r--r--include/linux/execmem.h49
1 files changed, 49 insertions, 0 deletions
diff --git a/include/linux/execmem.h b/include/linux/execmem.h
index 32cef1144117..64130ae19690 100644
--- a/include/linux/execmem.h
+++ b/include/linux/execmem.h
@@ -46,11 +46,27 @@ enum execmem_type {
/**
* enum execmem_range_flags - options for executable memory allocations
* @EXECMEM_KASAN_SHADOW: allocate kasan shadow
+ * @EXECMEM_ROX_CACHE: allocations should use ROX cache of huge pages
*/
enum execmem_range_flags {
EXECMEM_KASAN_SHADOW = (1 << 0),
+ EXECMEM_ROX_CACHE = (1 << 1),
};
+#ifdef CONFIG_ARCH_HAS_EXECMEM_ROX
+/**
+ * execmem_fill_trapping_insns - set memory to contain instructions that
+ * will trap
+ * @ptr: pointer to memory to fill
+ * @size: size of the range to fill
+ * @writable: is the memory poited by @ptr is writable or ROX
+ *
+ * A hook for architecures to fill execmem ranges with invalid instructions.
+ * Architectures that use EXECMEM_ROX_CACHE must implement this.
+ */
+void execmem_fill_trapping_insns(void *ptr, size_t size, bool writable);
+#endif
+
/**
* struct execmem_range - definition of an address space suitable for code and
* related data allocations
@@ -123,6 +139,39 @@ void *execmem_alloc(enum execmem_type type, size_t size);
*/
void execmem_free(void *ptr);
+#ifdef CONFIG_MMU
+/**
+ * execmem_vmap - create virtual mapping for EXECMEM_MODULE_DATA memory
+ * @size: size of the virtual mapping in bytes
+ *
+ * Maps virtually contiguous area in the range suitable for EXECMEM_MODULE_DATA.
+ *
+ * Return: the area descriptor on success or %NULL on failure.
+ */
+struct vm_struct *execmem_vmap(size_t size);
+#endif
+
+/**
+ * execmem_update_copy - copy an update to executable memory
+ * @dst: destination address to update
+ * @src: source address containing the data
+ * @size: how many bytes of memory shold be copied
+ *
+ * Copy @size bytes from @src to @dst using text poking if the memory at
+ * @dst is read-only.
+ *
+ * Return: a pointer to @dst or NULL on error
+ */
+void *execmem_update_copy(void *dst, const void *src, size_t size);
+
+/**
+ * execmem_is_rox - check if execmem is read-only
+ * @type - the execmem type to check
+ *
+ * Return: %true if the @type is read-only, %false if it's writable
+ */
+bool execmem_is_rox(enum execmem_type type);
+
#if defined(CONFIG_EXECMEM) && !defined(CONFIG_ARCH_WANTS_EXECMEM_LATE)
void execmem_init(void);
#else