[PATCH] m68k: Fix kernel_clone_args.flags in m68k_clone()

[Finn Thain]

Stan Johnson recently reported a failure from the 'dump' command:

  DUMP: Date of this level 0 dump: Fri Aug  9 23:37:15 2024
  DUMP: Dumping /dev/sda (an unlisted file system) to /dev/null
  DUMP: Label: none
  DUMP: Writing 10 Kilobyte records
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 3595695 blocks.
  DUMP: Context save fork fails in parent 671

The dump program uses the clone syscall with the CLONE_IO flag, that is,
flags == 0x80000000. When that value is cast from long int to u64 by
m68k_clone(), it undergoes sign-extension. The new value includes
CLONE_INTO_CGROUP so the validation in cgroup_css_set_fork() fails and
the syscall returns -EBADFD.

Avoid sign-extension by adopting the idiom used in kernel/fork.c when
casting clone flags.

Cc: Stan Johnson <userm57@xxxxxxxxx>
Reported-by: Stan Johnson <userm57@xxxxxxxxx>
Closes: https://lists.debian.org/debian-68k/2024/08/msg00000.html
Fixes: 6aabc1facdb2 ("m68k: Implement copy_thread_tls()")
Signed-off-by: Finn Thain <fthain@xxxxxxxxxxxxxx>
---
 arch/m68k/kernel/process.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c
index 2584e94e2134..873dc94fdcd8 100644
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -117,7 +117,7 @@ asmlinkage int m68k_clone(struct pt_regs *regs)
 {
 	/* regs will be equal to current_pt_regs() */
 	struct kernel_clone_args args = {
-		.flags		= regs->d1 & ~CSIGNAL,
+		.flags		= (lower_32_bits(regs->d1) & ~CSIGNAL),
 		.pidfd		= (int __user *)regs->d3,
 		.child_tid	= (int __user *)regs->d4,
 		.parent_tid	= (int __user *)regs->d3,
-- 
2.39.5