Merging upstream version 5.10.216.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

7 files changed, 29 insertions, 10 deletions

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index b28fabfc9..70271db83 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -445,6 +445,14 @@ config EFI
 	  allow the kernel to be booted as an EFI application. This
 	  is only useful on systems that have UEFI firmware.
 
+config CC_HAVE_STACKPROTECTOR_TLS
+	def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0)
+
+config STACKPROTECTOR_PER_TASK
+	def_bool y
+	depends on !GCC_PLUGIN_RANDSTRUCT
+	depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS
+
 endmenu
 
 config BUILTIN_DTB
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index daa679440..8572d23fb 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -88,6 +88,16 @@ KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
 # architectures.  It's faster to have GCC emit only aligned accesses.
 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
 
+ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
+prepare: stack_protector_prepare
+stack_protector_prepare: prepare0
+	$(eval KBUILD_CFLAGS += -mstack-protector-guard=tls		  \
+				-mstack-protector-guard-reg=tp		  \
+				-mstack-protector-guard-offset=$(shell	  \
+			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
+					include/generated/asm-offsets.h))
+endif
+
 # arch specific predefines for sparse
 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
 
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index b16304fdf..982745572 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -44,7 +44,7 @@
  * Define vmemmap for pfn_to_page & page_to_pfn calls. Needed if kernel
  * is configured with CONFIG_SPARSEMEM_VMEMMAP enabled.
  */
-#define vmemmap		((struct page *)VMEMMAP_START)
+#define vmemmap		((struct page *)VMEMMAP_START - (phys_ram_base >> PAGE_SHIFT))
 
 #define PCI_IO_SIZE      SZ_16M
 #define PCI_IO_END       VMEMMAP_START
@@ -456,8 +456,8 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
 #define PAGE_SHARED		__pgprot(0)
 #define PAGE_KERNEL		__pgprot(0)
 #define swapper_pg_dir		NULL
-#define TASK_SIZE		0xffffffffUL
-#define VMALLOC_START		0
+#define TASK_SIZE		_AC(-1, UL)
+#define VMALLOC_START		_AC(0, UL)
 #define VMALLOC_END		TASK_SIZE
 
 static inline void __kernel_map_pages(struct page *page, int numpages, int enable) {}
diff --git a/arch/riscv/include/asm/stackprotector.h b/arch/riscv/include/asm/stackprotector.h
index 5962f8891..09093af46 100644
--- a/arch/riscv/include/asm/stackprotector.h
+++ b/arch/riscv/include/asm/stackprotector.h
@@ -24,6 +24,7 @@ static __always_inline void boot_init_stack_canary(void)
 	canary &= CANARY_MASK;
 
 	current->stack_canary = canary;
-	__stack_chk_guard = current->stack_canary;
+	if (!IS_ENABLED(CONFIG_STACKPROTECTOR_PER_TASK))
+		__stack_chk_guard = current->stack_canary;
 }
 #endif /* _ASM_RISCV_STACKPROTECTOR_H */
diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h
index 66af6abfe..c351231b7 100644
--- a/arch/riscv/include/asm/uaccess.h
+++ b/arch/riscv/include/asm/uaccess.h
@@ -468,7 +468,7 @@ unsigned long __must_check clear_user(void __user *to, unsigned long n)
 
 #define __get_kernel_nofault(dst, src, type, err_label)			\
 do {									\
-	long __kr_err;							\
+	long __kr_err = 0;						\
 									\
 	__get_user_nocheck(*((type *)(dst)), (type *)(src), __kr_err);	\
 	if (unlikely(__kr_err))						\
@@ -477,7 +477,7 @@ do {									\
 
 #define __put_kernel_nofault(dst, src, type, err_label)			\
 do {									\
-	long __kr_err;							\
+	long __kr_err = 0;						\
 									\
 	__put_user_nocheck(*((type *)(src)), (type *)(dst), __kr_err);	\
 	if (unlikely(__kr_err))						\
diff --git a/arch/riscv/kernel/asm-offsets.c b/arch/riscv/kernel/asm-offsets.c
index db203442c..877ff65b4 100644
--- a/arch/riscv/kernel/asm-offsets.c
+++ b/arch/riscv/kernel/asm-offsets.c
@@ -66,6 +66,9 @@ void asm_offsets(void)
 	OFFSET(TASK_THREAD_F30, task_struct, thread.fstate.f[30]);
 	OFFSET(TASK_THREAD_F31, task_struct, thread.fstate.f[31]);
 	OFFSET(TASK_THREAD_FCSR, task_struct, thread.fstate.fcsr);
+#ifdef CONFIG_STACKPROTECTOR
+	OFFSET(TSK_STACK_CANARY, task_struct, stack_canary);
+#endif
 
 	DEFINE(PT_SIZE, sizeof(struct pt_regs));
 	OFFSET(PT_EPC, pt_regs, epc);
diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
index 7868050ff..9dac6bec3 100644
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -22,9 +22,7 @@
 #include <asm/switch_to.h>
 #include <asm/thread_info.h>
 
-register unsigned long gp_in_global __asm__("gp");
-
-#ifdef CONFIG_STACKPROTECTOR
+#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_STACKPROTECTOR_PER_TASK)
 #include <linux/stackprotector.h>
 unsigned long __stack_chk_guard __read_mostly;
 EXPORT_SYMBOL(__stack_chk_guard);
@@ -117,7 +115,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg,
 	if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) {
 		/* Kernel thread */
 		memset(childregs, 0, sizeof(struct pt_regs));
-		childregs->gp = gp_in_global;
 		/* Supervisor/Machine, irqs on: */
 		childregs->status = SR_PP | SR_PIE;