Merge tag 'uml-for-linux-6.15-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux

01f95500 · Linus Torvalds <[email protected]> · 2025-05-05 08:14:53 -07:00

Pull uml fix from Johannes Berg:
 "There's just a single fix here for the _nofault changes that were
  causing issues with clang, and then when we looked at it some other
  issues seemed to exist"

* tag 'uml-for-linux-6.15-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux:
  um: fix _nofault accesses

Commit: 01f95500a162fca88cefab9ed64ceded5afabc12
Parents: 7b26feb4 · 68025adf

Merge commit. Changes below are compared with the first parent: 7b26feb4.

Changes

4 files changed · +17 −15

File	Status	Add	Del	Content
arch/um/include/asm/uaccess.h	modified	+2	−0	View file
arch/um/kernel/trap.c	modified	+13	−13	View file
arch/x86/um/shared/sysdep/faultinfo_32.h	modified	+1	−1	View file
arch/x86/um/shared/sysdep/faultinfo_64.h	modified	+1	−1	View file

arch/um/include/asm/uaccess.h

View file

diff --git a/arch/um/include/asm/uaccess.h b/arch/um/include/asm/uaccess.h
index 3a08f90..1c6e0ae 100644
--- a/arch/um/include/asm/uaccess.h
+++ b/arch/um/include/asm/uaccess.h
@@ -55,6 +55,7 @@ do {									\
 		goto err_label;						\
 	}								\
 	*((type *)dst) = get_unaligned((type *)(src));			\
+	barrier();							\
 	current->thread.segv_continue = NULL;				\
 } while (0)
 
@@ -66,6 +67,7 @@ do {									\
 	if (__faulted)							\
 		goto err_label;						\
 	put_unaligned(*((type *)src), (type *)(dst));			\
+	barrier();							\
 	current->thread.segv_continue = NULL;				\
 } while (0)
 

arch/um/kernel/trap.c

View file

diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
index ce07315..ef2272e 100644
--- a/arch/um/kernel/trap.c
+++ b/arch/um/kernel/trap.c
@@ -225,20 +225,20 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
 			panic("Failed to sync kernel TLBs: %d", err);
 		goto out;
 	}
-	else if (current->mm == NULL) {
-		if (current->pagefault_disabled) {
-			if (!mc) {
-				show_regs(container_of(regs, struct pt_regs, regs));
-				panic("Segfault with pagefaults disabled but no mcontext");
-			}
-			if (!current->thread.segv_continue) {
-				show_regs(container_of(regs, struct pt_regs, regs));
-				panic("Segfault without recovery target");
-			}
-			mc_set_rip(mc, current->thread.segv_continue);
-			current->thread.segv_continue = NULL;
-			goto out;
+	else if (current->pagefault_disabled) {
+		if (!mc) {
+			show_regs(container_of(regs, struct pt_regs, regs));
+			panic("Segfault with pagefaults disabled but no mcontext");
 		}
+		if (!current->thread.segv_continue) {
+			show_regs(container_of(regs, struct pt_regs, regs));
+			panic("Segfault without recovery target");
+		}
+		mc_set_rip(mc, current->thread.segv_continue);
+		current->thread.segv_continue = NULL;
+		goto out;
+	}
+	else if (current->mm == NULL) {
 		show_regs(container_of(regs, struct pt_regs, regs));
 		panic("Segfault with no mm");
 	}

arch/x86/um/shared/sysdep/faultinfo_32.h

View file

diff --git a/arch/x86/um/shared/sysdep/faultinfo_32.h b/arch/x86/um/shared/sysdep/faultinfo_32.h
index ab5c8e4..9193a77 100644
--- a/arch/x86/um/shared/sysdep/faultinfo_32.h
+++ b/arch/x86/um/shared/sysdep/faultinfo_32.h
@@ -31,8 +31,8 @@ struct faultinfo {
 
 #define ___backtrack_faulted(_faulted)					\
 	asm volatile (							\
-		"mov $0, %0\n"						\
 		"movl $__get_kernel_nofault_faulted_%=,%1\n"		\
+		"mov $0, %0\n"						\
 		"jmp _end_%=\n"						\
 		"__get_kernel_nofault_faulted_%=:\n"			\
 		"mov $1, %0;"						\

arch/x86/um/shared/sysdep/faultinfo_64.h

View file

diff --git a/arch/x86/um/shared/sysdep/faultinfo_64.h b/arch/x86/um/shared/sysdep/faultinfo_64.h
index 26fb483..61e4ca1 100644
--- a/arch/x86/um/shared/sysdep/faultinfo_64.h
+++ b/arch/x86/um/shared/sysdep/faultinfo_64.h
@@ -31,8 +31,8 @@ struct faultinfo {
 
 #define ___backtrack_faulted(_faulted)					\
 	asm volatile (							\
-		"mov $0, %0\n"						\
 		"movq $__get_kernel_nofault_faulted_%=,%1\n"		\
+		"mov $0, %0\n"						\
 		"jmp _end_%=\n"						\
 		"__get_kernel_nofault_faulted_%=:\n"			\
 		"mov $1, %0;"						\