Merge tag 'v4.15-rc1' into patchwork

Linux 4.15-rc1

* tag 'v4.15-rc1': (12179 commits)
  Linux 4.15-rc1
  ARM: BUG if jumping to usermode address in kernel mode
  m68k/macboing: Fix missed timer callback assignment
  afs: remove redundant assignment of dvnode to itself
  afs: cell: Remove unnecessary code in afs_lookup_cell
  afs: Fix signal handling in some file ops
  afs: Fix some dentry handling in dir ops and missing key_puts
  afs: Make afs_write_begin() avoid writing to a page that's being stored
  sched/debug: Fix task state recording/printout
  x86/decoder: Add new TEST instruction pattern
  x86/PCI: Remove unused HyperTransport interrupt support
  x86/umip: Fix insn_get_code_seg_params()'s return value
  x86/boot/KASLR: Remove unused variable
  genirq/matrix: Make - vs ?: Precedence explicit
  irqchip/imgpdc: Use resource_size function on resource object
  irqchip/qcom: Fix u32 comparison with value less than zero
  ipvlan: Fix insufficient skb linear check for ipv6 icmp
  ipvlan: Fix insufficient skb linear check for arp
  geneve: only configure or fill UDP_ZERO_CSUM6_RX/TX info when CONFIG_IPV6
  net: dsa: bcm_sf2: Clear IDDQ_GLOBAL_PWR bit for PHY
  ...

1 files changed, 34 insertions, 0 deletions

diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
index 194991ef9347..fc5c1be3f6f4 100644
--- a/include/linux/livepatch.h
+++ b/include/linux/livepatch.h
@@ -87,10 +87,35 @@ struct klp_func {
 	bool transition;
 };
 
+struct klp_object;
+
+/**
+ * struct klp_callbacks - pre/post live-(un)patch callback structure
+ * @pre_patch:		executed before code patching
+ * @post_patch:		executed after code patching
+ * @pre_unpatch:	executed before code unpatching
+ * @post_unpatch:	executed after code unpatching
+ * @post_unpatch_enabled:	flag indicating if post-unpatch callback
+ * 				should run
+ *
+ * All callbacks are optional.  Only the pre-patch callback, if provided,
+ * will be unconditionally executed.  If the parent klp_object fails to
+ * patch for any reason, including a non-zero error status returned from
+ * the pre-patch callback, no further callbacks will be executed.
+ */
+struct klp_callbacks {
+	int (*pre_patch)(struct klp_object *obj);
+	void (*post_patch)(struct klp_object *obj);
+	void (*pre_unpatch)(struct klp_object *obj);
+	void (*post_unpatch)(struct klp_object *obj);
+	bool post_unpatch_enabled;
+};
+
 /**
  * struct klp_object - kernel object structure for live patching
  * @name:	module name (or NULL for vmlinux)
  * @funcs:	function entries for functions to be patched in the object
+ * @callbacks:	functions to be executed pre/post (un)patching
  * @kobj:	kobject for sysfs resources
  * @mod:	kernel module associated with the patched object
  *		(NULL for vmlinux)
@@ -100,6 +125,7 @@ struct klp_object {
 	/* external */
 	const char *name;
 	struct klp_func *funcs;
+	struct klp_callbacks callbacks;
 
 	/* internal */
 	struct kobject kobj;
@@ -164,6 +190,14 @@ static inline bool klp_have_reliable_stack(void)
 	       IS_ENABLED(CONFIG_HAVE_RELIABLE_STACKTRACE);
 }
 
+void *klp_shadow_get(void *obj, unsigned long id);
+void *klp_shadow_alloc(void *obj, unsigned long id, void *data,
+		       size_t size, gfp_t gfp_flags);
+void *klp_shadow_get_or_alloc(void *obj, unsigned long id, void *data,
+			      size_t size, gfp_t gfp_flags);
+void klp_shadow_free(void *obj, unsigned long id);
+void klp_shadow_free_all(unsigned long id);
+
 #else /* !CONFIG_LIVEPATCH */
 
 static inline int klp_module_coming(struct module *mod) { return 0; }