diff options
Diffstat (limited to 'sys/kern/kern_exec.c')
| -rw-r--r-- | sys/kern/kern_exec.c | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c index a6f333eec9e2..612797c2e075 100644 --- a/sys/kern/kern_exec.c +++ b/sys/kern/kern_exec.c @@ -119,6 +119,7 @@ SYSCTL_INT(_kern, OID_AUTO, coredump_pack_vmmapinfo, CTLFLAG_RWTUN, static int sysctl_kern_ps_strings(SYSCTL_HANDLER_ARGS); static int sysctl_kern_usrstack(SYSCTL_HANDLER_ARGS); +static int sysctl_kern_stacktop(SYSCTL_HANDLER_ARGS); static int sysctl_kern_stackprot(SYSCTL_HANDLER_ARGS); static int do_execve(struct thread *td, struct image_args *args, struct mac *mac_p, struct vmspace *oldvmspace); @@ -133,6 +134,10 @@ SYSCTL_PROC(_kern, KERN_USRSTACK, usrstack, CTLTYPE_ULONG|CTLFLAG_RD| CTLFLAG_CAPRD|CTLFLAG_MPSAFE, NULL, 0, sysctl_kern_usrstack, "LU", "Top of process stack"); +SYSCTL_PROC(_kern, KERN_STACKTOP, stacktop, CTLTYPE_ULONG | CTLFLAG_RD | + CTLFLAG_CAPRD | CTLFLAG_MPSAFE, NULL, 0, sysctl_kern_stacktop, "LU", + "Top of process stack with stack gap."); + SYSCTL_PROC(_kern, OID_AUTO, stackprot, CTLTYPE_INT|CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, 0, sysctl_kern_stackprot, "I", "Stack memory permissions"); @@ -191,7 +196,31 @@ sysctl_kern_usrstack(SYSCTL_HANDLER_ARGS) #endif error = SYSCTL_OUT(req, &p->p_sysent->sv_usrstack, sizeof(p->p_sysent->sv_usrstack)); - return error; + return (error); +} + +static int +sysctl_kern_stacktop(SYSCTL_HANDLER_ARGS) +{ + vm_offset_t stacktop; + struct proc *p; + int error; + + p = curproc; +#ifdef SCTL_MASK32 + if (req->flags & SCTL_MASK32) { + unsigned int val; + + val = (unsigned int)(p->p_sysent->sv_usrstack - + p->p_vmspace->vm_stkgap); + error = SYSCTL_OUT(req, &val, sizeof(val)); + } else +#endif + { + stacktop = p->p_sysent->sv_usrstack - p->p_vmspace->vm_stkgap; + error = SYSCTL_OUT(req, &stacktop, sizeof(stacktop)); + } + return (error); } static int |