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Implement support for binary to requesting specific stack size for the

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initial thread.  It is read by the ELF image activator as the virtual
size of the PT_GNU_STACK program header entry, and can be specified by
the linker option -z stack-size in newer binutils.

The soft RLIMIT_STACK is auto-increased if possible, to satisfy the
binary' request.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
kib 2015-04-15 08:13:53 +00:00
parent 4f67ee3ab1
commit b4924fbf83
4 changed files with 23 additions and 3 deletions
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1
sys/kern/imgact_elf.c
View File

@ -782,6 +782,7 @@ __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
if (__elfN(nxstack))
imgp->stack_prot =
__elfN(trans_prot)(phdr[i].p_flags);
imgp->stack_sz = phdr[i].p_memsz;
break;
}
}

17
sys/kern/kern_exec.c
View File

@ -1009,6 +1009,7 @@ exec_new_vmspace(imgp, sv)
struct proc *p = imgp->proc;
struct vmspace *vmspace = p->p_vmspace;
vm_object_t obj;
struct rlimit rlim_stack;
vm_offset_t sv_minuser, stack_addr;
vm_map_t map;
u_long ssiz;
@ -1058,10 +1059,22 @@ exec_new_vmspace(imgp, sv)
}
/* Allocate a new stack */
if (sv->sv_maxssiz != NULL)
if (imgp->stack_sz != 0) {
ssiz = imgp->stack_sz;
PROC_LOCK(p);
lim_rlimit(p, RLIMIT_STACK, &rlim_stack);
PROC_UNLOCK(p);
if (ssiz > rlim_stack.rlim_max)
ssiz = rlim_stack.rlim_max;
if (ssiz > rlim_stack.rlim_cur) {
rlim_stack.rlim_cur = ssiz;
kern_setrlimit(curthread, RLIMIT_STACK, &rlim_stack);
}
} else if (sv->sv_maxssiz != NULL) {
ssiz = *sv->sv_maxssiz;
else
} else {
ssiz = maxssiz;
}
stack_addr = sv->sv_usrstack - ssiz;
error = vm_map_stack(map, stack_addr, (vm_size_t)ssiz,
obj != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :

7
sys/kern/kern_resource.c
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@ -745,7 +745,12 @@ kern_proc_setrlimit(struct thread *td, struct proc *p, u_int which,
if (newlim != NULL)
lim_free(oldlim);
if (which == RLIMIT_STACK) {
if (which == RLIMIT_STACK &&
/*
* Skip calls from exec_new_vmspace(), done when stack is
* not mapped yet.
*/
(td != curthread || (p->p_flag & P_INEXEC) == 0)) {
/*
* Stack is allocated to the max at exec time with only
* "rlim_cur" bytes accessible. If stack limit is going

1
sys/sys/imgact.h
View File

@ -80,6 +80,7 @@ struct image_params {
unsigned long pagesizes;
int pagesizeslen;
vm_prot_t stack_prot;
u_long stack_sz;
};
#ifdef _KERNEL