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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 <thomas@m3y3r.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Thomas Meyer 2017-07-06 00:31:14 +02:00 committed by Richard Weinberger
parent 1bcbfbfdeb
commit 22e19c8d06
1 changed files with 8 additions and 2 deletions
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10
arch/um/os-Linux/skas/process.c
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@ -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();