Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f49481bc authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
Browse files

[PATCH] x86-64: Check return value of putreg in PTRACE_SETREGS 



This means if an illegal value is set for the segment registers there
ptrace will error out now with an errno instead of silently ignoring
it.

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent 2f7a2a79

arch/x86_64/kernel/ptrace.c

+6 −2
Original line number Diff line number Diff line
@@ -536,8 +536,12 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) 
		}

		ret = 0;

		for (ui = 0; ui < sizeof(struct user_regs_struct); ui += sizeof(long)) {

			ret |= __get_user(tmp, (unsigned long __user *) data);

			putreg(child, ui, tmp);

			ret = __get_user(tmp, (unsigned long __user *) data);

			if (ret)

				break;

			ret = putreg(child, ui, tmp);

			if (ret)

				break;

			data += sizeof(long);

		}

		break;