diff options
Diffstat (limited to 'sys/kern/imgact_aout.c')
| -rw-r--r-- | sys/kern/imgact_aout.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/sys/kern/imgact_aout.c b/sys/kern/imgact_aout.c new file mode 100644 index 0000000..3ae78de --- /dev/null +++ b/sys/kern/imgact_aout.c @@ -0,0 +1,343 @@ +/*- + * Copyright (c) 1993, David Greenman + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/exec.h> +#include <sys/imgact.h> +#include <sys/imgact_aout.h> +#include <sys/kernel.h> +#include <sys/limits.h> +#include <sys/lock.h> +#include <sys/malloc.h> +#include <sys/mutex.h> +#include <sys/proc.h> +#include <sys/racct.h> +#include <sys/resourcevar.h> +#include <sys/signalvar.h> +#include <sys/syscall.h> +#include <sys/sysent.h> +#include <sys/systm.h> +#include <sys/vnode.h> + +#include <machine/frame.h> +#include <machine/md_var.h> + +#include <vm/vm.h> +#include <vm/pmap.h> +#include <vm/vm_map.h> +#include <vm/vm_object.h> +#include <vm/vm_param.h> + +#ifdef __amd64__ +#include <compat/freebsd32/freebsd32_signal.h> +#include <compat/freebsd32/freebsd32_util.h> +#include <compat/freebsd32/freebsd32_proto.h> +#include <compat/freebsd32/freebsd32_syscall.h> +#include <compat/ia32/ia32_signal.h> +#endif + +static int exec_aout_imgact(struct image_params *imgp); +static int aout_fixup(register_t **stack_base, struct image_params *imgp); + +#if defined(__i386__) +struct sysentvec aout_sysvec = { + .sv_size = SYS_MAXSYSCALL, + .sv_table = sysent, + .sv_mask = 0, + .sv_sigsize = 0, + .sv_sigtbl = NULL, + .sv_errsize = 0, + .sv_errtbl = NULL, + .sv_transtrap = NULL, + .sv_fixup = aout_fixup, + .sv_sendsig = sendsig, + .sv_sigcode = sigcode, + .sv_szsigcode = &szsigcode, + .sv_prepsyscall = NULL, + .sv_name = "FreeBSD a.out", + .sv_coredump = NULL, + .sv_imgact_try = NULL, + .sv_minsigstksz = MINSIGSTKSZ, + .sv_pagesize = PAGE_SIZE, + .sv_minuser = VM_MIN_ADDRESS, + .sv_maxuser = VM_MAXUSER_ADDRESS, + .sv_usrstack = USRSTACK, + .sv_psstrings = PS_STRINGS, + .sv_stackprot = VM_PROT_ALL, + .sv_copyout_strings = exec_copyout_strings, + .sv_setregs = exec_setregs, + .sv_fixlimit = NULL, + .sv_maxssiz = NULL, + .sv_flags = SV_ABI_FREEBSD | SV_AOUT | SV_IA32 | SV_ILP32, + .sv_set_syscall_retval = cpu_set_syscall_retval, + .sv_fetch_syscall_args = cpu_fetch_syscall_args, + .sv_syscallnames = syscallnames, + .sv_schedtail = NULL, +}; + +#elif defined(__amd64__) + +#define AOUT32_USRSTACK 0xbfc00000 +#define AOUT32_PS_STRINGS \ + (AOUT32_USRSTACK - sizeof(struct freebsd32_ps_strings)) +#define AOUT32_MINUSER FREEBSD32_MINUSER + +extern const char *freebsd32_syscallnames[]; +extern u_long ia32_maxssiz; + +struct sysentvec aout_sysvec = { + .sv_size = FREEBSD32_SYS_MAXSYSCALL, + .sv_table = freebsd32_sysent, + .sv_mask = 0, + .sv_sigsize = 0, + .sv_sigtbl = NULL, + .sv_errsize = 0, + .sv_errtbl = NULL, + .sv_transtrap = NULL, + .sv_fixup = aout_fixup, + .sv_sendsig = ia32_sendsig, + .sv_sigcode = ia32_sigcode, + .sv_szsigcode = &sz_ia32_sigcode, + .sv_prepsyscall = NULL, + .sv_name = "FreeBSD a.out", + .sv_coredump = NULL, + .sv_imgact_try = NULL, + .sv_minsigstksz = MINSIGSTKSZ, + .sv_pagesize = IA32_PAGE_SIZE, + .sv_minuser = AOUT32_MINUSER, + .sv_maxuser = AOUT32_USRSTACK, + .sv_usrstack = AOUT32_USRSTACK, + .sv_psstrings = AOUT32_PS_STRINGS, + .sv_stackprot = VM_PROT_ALL, + .sv_copyout_strings = freebsd32_copyout_strings, + .sv_setregs = ia32_setregs, + .sv_fixlimit = ia32_fixlimit, + .sv_maxssiz = &ia32_maxssiz, + .sv_flags = SV_ABI_FREEBSD | SV_AOUT | SV_IA32 | SV_ILP32, + .sv_set_syscall_retval = ia32_set_syscall_retval, + .sv_fetch_syscall_args = ia32_fetch_syscall_args, + .sv_syscallnames = freebsd32_syscallnames, +}; +#else +#error "Port me" +#endif + +static int +aout_fixup(register_t **stack_base, struct image_params *imgp) +{ + + *(char **)stack_base -= sizeof(uint32_t); + return (suword32(*stack_base, imgp->args->argc)); +} + +static int +exec_aout_imgact(struct image_params *imgp) +{ + const struct exec *a_out = (const struct exec *) imgp->image_header; + struct vmspace *vmspace; + vm_map_t map; + vm_object_t object; + vm_offset_t text_end, data_end; + unsigned long virtual_offset; + unsigned long file_offset; + unsigned long bss_size; + int error; + + /* + * Linux and *BSD binaries look very much alike, + * only the machine id is different: + * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI. + * NetBSD is in network byte order.. ugh. + */ + if (((a_out->a_midmag >> 16) & 0xff) != 0x86 && + ((a_out->a_midmag >> 16) & 0xff) != 0 && + ((((int)ntohl(a_out->a_midmag)) >> 16) & 0xff) != 0x86) + return -1; + + /* + * Set file/virtual offset based on a.out variant. + * We do two cases: host byte order and network byte order + * (for NetBSD compatibility) + */ + switch ((int)(a_out->a_midmag & 0xffff)) { + case ZMAGIC: + virtual_offset = 0; + if (a_out->a_text) { + file_offset = PAGE_SIZE; + } else { + /* Bill's "screwball mode" */ + file_offset = 0; + } + break; + case QMAGIC: + virtual_offset = PAGE_SIZE; + file_offset = 0; + /* Pass PS_STRINGS for BSD/OS binaries only. */ + if (N_GETMID(*a_out) == MID_ZERO) + imgp->ps_strings = aout_sysvec.sv_psstrings; + break; + default: + /* NetBSD compatibility */ + switch ((int)(ntohl(a_out->a_midmag) & 0xffff)) { + case ZMAGIC: + case QMAGIC: + virtual_offset = PAGE_SIZE; + file_offset = 0; + break; + default: + return (-1); + } + } + + bss_size = roundup(a_out->a_bss, PAGE_SIZE); + + /* + * Check various fields in header for validity/bounds. + */ + if (/* entry point must lay with text region */ + a_out->a_entry < virtual_offset || + a_out->a_entry >= virtual_offset + a_out->a_text || + + /* text and data size must each be page rounded */ + a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK + +#ifdef __amd64__ + || + /* overflows */ + virtual_offset + a_out->a_text + a_out->a_data + bss_size > UINT_MAX +#endif + ) + return (-1); + + /* text + data can't exceed file size */ + if (a_out->a_data + a_out->a_text > imgp->attr->va_size) + return (EFAULT); + + /* + * text/data/bss must not exceed limits + */ + PROC_LOCK(imgp->proc); + if (/* text can't exceed maximum text size */ + a_out->a_text > maxtsiz || + + /* data + bss can't exceed rlimit */ + a_out->a_data + bss_size > lim_cur(imgp->proc, RLIMIT_DATA) || + racct_set(imgp->proc, RACCT_DATA, a_out->a_data + bss_size) != 0) { + PROC_UNLOCK(imgp->proc); + return (ENOMEM); + } + PROC_UNLOCK(imgp->proc); + + /* + * Avoid a possible deadlock if the current address space is destroyed + * and that address space maps the locked vnode. In the common case, + * the locked vnode's v_usecount is decremented but remains greater + * than zero. Consequently, the vnode lock is not needed by vrele(). + * However, in cases where the vnode lock is external, such as nullfs, + * v_usecount may become zero. + */ + VOP_UNLOCK(imgp->vp, 0); + + /* + * Destroy old process VM and create a new one (with a new stack) + */ + error = exec_new_vmspace(imgp, &aout_sysvec); + + vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); + if (error) + return (error); + + /* + * The vm space can be changed by exec_new_vmspace + */ + vmspace = imgp->proc->p_vmspace; + + object = imgp->object; + map = &vmspace->vm_map; + vm_map_lock(map); + vm_object_reference(object); + + text_end = virtual_offset + a_out->a_text; + error = vm_map_insert(map, object, + file_offset, + virtual_offset, text_end, + VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL, + MAP_COPY_ON_WRITE | MAP_PREFAULT); + if (error) { + vm_map_unlock(map); + vm_object_deallocate(object); + return (error); + } + data_end = text_end + a_out->a_data; + if (a_out->a_data) { + vm_object_reference(object); + error = vm_map_insert(map, object, + file_offset + a_out->a_text, + text_end, data_end, + VM_PROT_ALL, VM_PROT_ALL, + MAP_COPY_ON_WRITE | MAP_PREFAULT); + if (error) { + vm_map_unlock(map); + vm_object_deallocate(object); + return (error); + } + } + + if (bss_size) { + error = vm_map_insert(map, NULL, 0, + data_end, data_end + bss_size, + VM_PROT_ALL, VM_PROT_ALL, 0); + if (error) { + vm_map_unlock(map); + return (error); + } + } + vm_map_unlock(map); + + /* Fill in process VM information */ + vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT; + vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT; + vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset; + vmspace->vm_daddr = (caddr_t) (uintptr_t) + (virtual_offset + a_out->a_text); + + /* Fill in image_params */ + imgp->interpreted = 0; + imgp->entry_addr = a_out->a_entry; + + imgp->proc->p_sysent = &aout_sysvec; + + return (0); +} + +/* + * Tell kern_execve.c about it, with a little help from the linker. + */ +static struct execsw aout_execsw = { exec_aout_imgact, "a.out" }; +EXEC_SET(aout, aout_execsw); |
