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Diffstat (limited to 'arch/um/kernel/skas/clone.c')
-rw-r--r--arch/um/kernel/skas/clone.c28
1 files changed, 12 insertions, 16 deletions
diff --git a/arch/um/kernel/skas/clone.c b/arch/um/kernel/skas/clone.c
index bfb70c456b30..592cdb138441 100644
--- a/arch/um/kernel/skas/clone.c
+++ b/arch/um/kernel/skas/clone.c
@@ -24,29 +24,25 @@
void __attribute__ ((__section__ (".__syscall_stub")))
stub_clone_handler(void)
{
- struct stub_data *data = (struct stub_data *) STUB_DATA;
+ int stack;
+ struct stub_data *data = (void *) ((unsigned long)&stack & ~(UM_KERN_PAGE_SIZE - 1));
long err;
err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
- STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *));
- if (err != 0)
- goto out;
+ (unsigned long)data + UM_KERN_PAGE_SIZE / 2 - sizeof(void *));
+ if (err) {
+ data->parent_err = err;
+ goto done;
+ }
err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
- if (err)
- goto out;
+ if (err) {
+ data->child_err = err;
+ goto done;
+ }
- remap_stack(data->fd, data->offset);
- goto done;
+ remap_stack_and_trap();
- out:
- /*
- * save current result.
- * Parent: pid;
- * child: retcode of mmap already saved and it jumps around this
- * assignment
- */
- data->err = err;
done:
trap_myself();
}