From 22e19c8d062cc19832cde13225cbc6e5283cd969 Mon Sep 17 00:00:00 2001 From: Thomas Meyer Date: Thu, 6 Jul 2017 00:31:14 +0200 Subject: [PATCH] um: userspace - be more verbose in ptrace set regs error When ptrace fails to set GP/FP regs for the target process, log the error before crashing the UML kernel. Signed-off-by: Thomas Meyer Signed-off-by: Richard Weinberger --- arch/um/os-Linux/skas/process.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c index 03b3c4cc7735..31c9be2c2bdd 100644 --- a/arch/um/os-Linux/skas/process.c +++ b/arch/um/os-Linux/skas/process.c @@ -323,11 +323,17 @@ void userspace(struct uml_pt_regs *regs) * fail. In this case, there is nothing to do but * just kill the process. */ - if (ptrace(PTRACE_SETREGS, pid, 0, regs->gp)) + if (ptrace(PTRACE_SETREGS, pid, 0, regs->gp)) { + printk(UM_KERN_ERR "userspace - ptrace set regs " + "failed, errno = %d\n", errno); fatal_sigsegv(); + } - if (put_fp_registers(pid, regs->fp)) + if (put_fp_registers(pid, regs->fp)) { + printk(UM_KERN_ERR "userspace - ptrace set fp regs " + "failed, errno = %d\n", errno); fatal_sigsegv(); + } /* Now we set local_using_sysemu to be used for one loop */ local_using_sysemu = get_using_sysemu(); -- 2.20.1