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Disallow a debugger on 64bit system to set fs/gs bases of the 32bit

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process beyond the end of the process address space.  Such setting is
not dangerous to the kernel integrity, but it causes confusing
application misbehaviour.

Sponsored by:	The FreeBSD Foundation
MFC after:	12 days
This commit is contained in:
Konstantin Belousov 2015-07-01 16:37:03 +00:00
parent 02e9fc7858
commit 3ce8c94f29
1 changed files with 1 additions and 1 deletions
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2
sys/amd64/amd64/ptrace_machdep.c
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@ -231,7 +231,7 @@ cpu_ptrace(struct thread *td, int req, void *addr, int data)
error = copyin(addr, &rv, sizeof(rv));
if (error != 0)
break;
if (rv >= VM_MAXUSER_ADDRESS) {
if (rv >= td->td_proc->p_sysent->sv_maxuser) {
error = EINVAL;
break;
}