arm64: get rid of fork/vfork/clone wrappers
[fixes from Catalin Marinas folded]
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index bf615e2..f82987a 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -246,14 +246,20 @@
*childregs = *regs;
childregs->regs[0] = 0;
if (is_compat_thread(task_thread_info(p))) {
- childregs->compat_sp = stack_start;
+ if (stack_start)
+ childregs->compat_sp = stack_start;
} else {
/*
* Read the current TLS pointer from tpidr_el0 as it may be
* out-of-sync with the saved value.
*/
asm("mrs %0, tpidr_el0" : "=r" (tls));
- childregs->sp = stack_start;
+ if (stack_start) {
+ /* 16-byte aligned stack mandatory on AArch64 */
+ if (stack_start & 15)
+ return -EINVAL;
+ childregs->sp = stack_start;
+ }
}
/*
* If a TLS pointer was passed to clone (4th argument), use it
