imgact_gzip.c revision 24848
13332Sphk/* 23332Sphk * ---------------------------------------------------------------------------- 33332Sphk * "THE BEER-WARE LICENSE" (Revision 42): 43784Sphk * <phk@login.dkuug.dk> wrote this file. As long as you retain this notice you 53332Sphk * can do whatever you want with this stuff. If we meet some day, and you think 63332Sphk * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 73332Sphk * ---------------------------------------------------------------------------- 83332Sphk * 924848Sdyson * $Id: imgact_gzip.c,v 1.28 1997/02/22 09:38:57 peter Exp $ 103332Sphk * 113332Sphk * This module handles execution of a.out files which have been run through 123784Sphk * "gzip". This saves diskspace, but wastes cpu-cycles and VM. 133332Sphk * 143332Sphk * TODO: 153332Sphk * text-segments should be made R/O after being filled 163332Sphk * is the vm-stuff safe ? 173332Sphk * should handle the entire header of gzip'ed stuff. 183332Sphk * inflate isn't quite reentrant yet... 193332Sphk * error-handling is a mess... 203332Sphk * so is the rest... 213417Scsgr * tidy up unnecesary includes 223332Sphk */ 233332Sphk 2420821Sjoerg#include "opt_rlimit.h" 2520821Sjoerg 263784Sphk#include <sys/param.h> 273332Sphk#include <sys/exec.h> 283332Sphk#include <sys/imgact.h> 293332Sphk#include <sys/imgact_aout.h> 303332Sphk#include <sys/kernel.h> 313507Scsgr#include <sys/mman.h> 3215494Sbde#include <sys/proc.h> 333507Scsgr#include <sys/resourcevar.h> 343332Sphk#include <sys/sysent.h> 353507Scsgr#include <sys/systm.h> 3615494Sbde#include <sys/vnode.h> 373784Sphk#include <sys/inflate.h> 383332Sphk 393332Sphk#include <vm/vm.h> 4012662Sdg#include <vm/vm_param.h> 4112662Sdg#include <vm/vm_prot.h> 4222521Sdyson#include <sys/lock.h> 4312662Sdg#include <vm/pmap.h> 4412662Sdg#include <vm/vm_map.h> 453332Sphk#include <vm/vm_kern.h> 4612662Sdg#include <vm/vm_extern.h> 473332Sphk 483784Sphkstruct imgact_gzip { 493784Sphk struct image_params *ip; 503784Sphk struct exec a_out; 513784Sphk int error; 523784Sphk int where; 533784Sphk u_char *inbuf; 543784Sphk u_long offset; 553784Sphk u_long output; 563784Sphk u_long len; 573784Sphk int idx; 583784Sphk u_long virtual_offset, file_offset, file_end, bss_size; 593784Sphk}; 603784Sphk 6112568Sbdestatic int exec_gzip_imgact __P((struct image_params *imgp)); 623784Sphkstatic int NextByte __P((void *vp)); 633784Sphkstatic int do_aout_hdr __P((struct imgact_gzip *)); 643784Sphkstatic int Flush __P((void *vp, u_char *, u_long siz)); 653784Sphk 6612568Sbdestatic int 6712130Sdgexec_gzip_imgact(imgp) 6812130Sdg struct image_params *imgp; 693332Sphk{ 703784Sphk int error, error2 = 0; 7117974Sbde const u_char *p = (const u_char *) imgp->image_header; 723784Sphk struct imgact_gzip igz; 733784Sphk struct inflate infl; 7417386Sphk struct vmspace *vmspace; 753332Sphk 763348Sphk /* If these four are not OK, it isn't a gzip file */ 773784Sphk if (p[0] != 0x1f) 783784Sphk return -1; /* 0 Simply magic */ 793784Sphk if (p[1] != 0x8b) 803784Sphk return -1; /* 1 Simply magic */ 813784Sphk if (p[2] != 0x08) 823784Sphk return -1; /* 2 Compression method */ 833784Sphk if (p[9] != 0x03) 843784Sphk return -1; /* 9 OS compressed on */ 853332Sphk 863784Sphk /* 873784Sphk * If this one contains anything but a comment or a filename marker, 883784Sphk * we don't want to chew on it 893348Sphk */ 903784Sphk if (p[3] & ~(0x18)) 913784Sphk return ENOEXEC; /* 3 Flags */ 923332Sphk 933348Sphk /* These are of no use to us */ 943784Sphk /* 4-7 Timestamp */ 953784Sphk /* 8 Extra flags */ 963348Sphk 973784Sphk bzero(&igz, sizeof igz); 983784Sphk bzero(&infl, sizeof infl); 993784Sphk infl.gz_private = (void *) &igz; 1003784Sphk infl.gz_input = NextByte; 1013784Sphk infl.gz_output = Flush; 1023332Sphk 10312130Sdg igz.ip = imgp; 1043784Sphk igz.idx = 10; 1053353Sphk 1063784Sphk if (p[3] & 0x08) { /* skip a filename */ 1073784Sphk while (p[igz.idx++]) 1083784Sphk if (igz.idx >= PAGE_SIZE) 1093784Sphk return ENOEXEC; 1103348Sphk } 1113784Sphk if (p[3] & 0x10) { /* skip a comment */ 1123784Sphk while (p[igz.idx++]) 1133784Sphk if (igz.idx >= PAGE_SIZE) 1143784Sphk return ENOEXEC; 1153348Sphk } 11617386Sphk igz.len = imgp->attr->va_size; 1173332Sphk 1183784Sphk error = inflate(&infl); 1193348Sphk 12017386Sphk if ( !error ) { 12117386Sphk vmspace = imgp->proc->p_vmspace; 12217386Sphk error = vm_map_protect(&vmspace->vm_map, 12317386Sphk (vm_offset_t) vmspace->vm_taddr, 12417386Sphk (vm_offset_t) (vmspace->vm_taddr + 12517386Sphk (vmspace->vm_tsize << PAGE_SHIFT)) , 12617386Sphk VM_PROT_READ|VM_PROT_EXECUTE,0); 12717386Sphk } 12817386Sphk 1293784Sphk if (igz.inbuf) { 1303784Sphk error2 = 1316579Sdg vm_map_remove(kernel_map, (vm_offset_t) igz.inbuf, 1326579Sdg (vm_offset_t) igz.inbuf + PAGE_SIZE); 1333332Sphk } 1343784Sphk if (igz.error || error || error2) { 1353784Sphk printf("Output=%lu ", igz.output); 1363784Sphk printf("Inflate_error=%d igz.error=%d error2=%d where=%d\n", 1373784Sphk error, igz.error, error2, igz.where); 1383348Sphk } 1393784Sphk if (igz.error) 1403784Sphk return igz.error; 1413784Sphk if (error) 1423784Sphk return ENOEXEC; 1438876Srgrimes if (error2) 1443784Sphk return error2; 1453784Sphk return 0; 1463332Sphk} 1473332Sphk 1483784Sphkstatic int 1493784Sphkdo_aout_hdr(struct imgact_gzip * gz) 1503332Sphk{ 1513784Sphk int error; 15224848Sdyson struct vmspace *vmspace; 15314703Sbde vm_offset_t vmaddr; 1543332Sphk 1553784Sphk /* 1563784Sphk * Set file/virtual offset based on a.out variant. We do two cases: 1573784Sphk * host byte order and network byte order (for NetBSD compatibility) 1583784Sphk */ 1593784Sphk switch ((int) (gz->a_out.a_magic & 0xffff)) { 1603332Sphk case ZMAGIC: 1613784Sphk gz->virtual_offset = 0; 1623784Sphk if (gz->a_out.a_text) { 16315538Sphk gz->file_offset = PAGE_SIZE; 1643784Sphk } else { 1653784Sphk /* Bill's "screwball mode" */ 1663784Sphk gz->file_offset = 0; 1673784Sphk } 1683784Sphk break; 1693332Sphk case QMAGIC: 17015538Sphk gz->virtual_offset = PAGE_SIZE; 1713784Sphk gz->file_offset = 0; 1723784Sphk break; 1733332Sphk default: 1743784Sphk /* NetBSD compatibility */ 1753784Sphk switch ((int) (ntohl(gz->a_out.a_magic) & 0xffff)) { 1763784Sphk case ZMAGIC: 1773784Sphk case QMAGIC: 17815538Sphk gz->virtual_offset = PAGE_SIZE; 1793784Sphk gz->file_offset = 0; 1803784Sphk break; 1813784Sphk default: 1823784Sphk gz->where = __LINE__; 1833784Sphk return (-1); 1843784Sphk } 1853332Sphk } 1863332Sphk 18715538Sphk gz->bss_size = roundup(gz->a_out.a_bss, PAGE_SIZE); 1883332Sphk 1893784Sphk /* 1903784Sphk * Check various fields in header for validity/bounds. 1913784Sphk */ 1923784Sphk if ( /* entry point must lay with text region */ 1933784Sphk gz->a_out.a_entry < gz->virtual_offset || 1943784Sphk gz->a_out.a_entry >= gz->virtual_offset + gz->a_out.a_text || 1953332Sphk 1963332Sphk /* text and data size must each be page rounded */ 19715538Sphk gz->a_out.a_text & PAGE_MASK || gz->a_out.a_data & PAGE_MASK) { 1983784Sphk gz->where = __LINE__; 1993784Sphk return (-1); 2003784Sphk } 2013784Sphk /* 2023784Sphk * text/data/bss must not exceed limits 2033784Sphk */ 2043784Sphk if ( /* text can't exceed maximum text size */ 2053784Sphk gz->a_out.a_text > MAXTSIZ || 2063332Sphk 2073332Sphk /* data + bss can't exceed maximum data size */ 2083784Sphk gz->a_out.a_data + gz->bss_size > MAXDSIZ || 2093332Sphk 2103332Sphk /* data + bss can't exceed rlimit */ 2113784Sphk gz->a_out.a_data + gz->bss_size > 2123332Sphk gz->ip->proc->p_rlimit[RLIMIT_DATA].rlim_cur) { 2133784Sphk gz->where = __LINE__; 2143784Sphk return (ENOMEM); 2153784Sphk } 2163784Sphk /* Find out how far we should go */ 2173784Sphk gz->file_end = gz->file_offset + gz->a_out.a_text + gz->a_out.a_data; 2183332Sphk 2193784Sphk /* copy in arguments and/or environment from old process */ 2203784Sphk error = exec_extract_strings(gz->ip); 2213784Sphk if (error) { 2223784Sphk gz->where = __LINE__; 2233784Sphk return (error); 2243784Sphk } 2253784Sphk /* 2263784Sphk * Destroy old process VM and create a new one (with a new stack) 2273784Sphk */ 2283784Sphk exec_new_vmspace(gz->ip); 2293348Sphk 23024848Sdyson vmspace = gz->ip->proc->p_vmspace; 23124848Sdyson 2323784Sphk vmaddr = gz->virtual_offset; 2333332Sphk 2343784Sphk error = vm_mmap(&vmspace->vm_map, 2353784Sphk &vmaddr, 23617386Sphk gz->a_out.a_text + gz->a_out.a_data, 23717386Sphk VM_PROT_ALL, VM_PROT_ALL, MAP_ANON | MAP_FIXED, 2383784Sphk 0, 2393784Sphk 0); 2403332Sphk 2413784Sphk if (error) { 2423784Sphk gz->where = __LINE__; 2433784Sphk return (error); 2443784Sphk } 24517386Sphk 2466579Sdg if (gz->bss_size != 0) { 2476579Sdg /* 24814087Sphk * Allocate demand-zeroed area for uninitialized data. 24914087Sphk * "bss" = 'block started by symbol' - named after the 25014087Sphk * IBM 7090 instruction of the same name. 2516579Sdg */ 25214087Sphk vmaddr = gz->virtual_offset + gz->a_out.a_text + 25314087Sphk gz->a_out.a_data; 25417386Sphk error = vm_map_find(&vmspace->vm_map, 25517386Sphk NULL, 25617386Sphk 0, 25717386Sphk &vmaddr, 25817386Sphk gz->bss_size, 25917386Sphk FALSE, VM_PROT_ALL, VM_PROT_ALL, 0); 2606579Sdg if (error) { 2616579Sdg gz->where = __LINE__; 2626579Sdg return (error); 2636579Sdg } 2643784Sphk } 2653784Sphk /* Fill in process VM information */ 2663784Sphk vmspace->vm_tsize = gz->a_out.a_text >> PAGE_SHIFT; 2673784Sphk vmspace->vm_dsize = (gz->a_out.a_data + gz->bss_size) >> PAGE_SHIFT; 2683784Sphk vmspace->vm_taddr = (caddr_t) gz->virtual_offset; 2693784Sphk vmspace->vm_daddr = (caddr_t) gz->virtual_offset + gz->a_out.a_text; 2703332Sphk 2713784Sphk /* Fill in image_params */ 2723784Sphk gz->ip->interpreted = 0; 2733784Sphk gz->ip->entry_addr = gz->a_out.a_entry; 2743332Sphk 2753784Sphk gz->ip->proc->p_sysent = &aout_sysvec; 2763332Sphk 2773784Sphk return 0; 2783784Sphk} 2793332Sphk 2803784Sphkstatic int 2813784SphkNextByte(void *vp) 2823784Sphk{ 2833784Sphk int error; 2843784Sphk struct imgact_gzip *igz = (struct imgact_gzip *) vp; 2853332Sphk 2863784Sphk if (igz->idx >= igz->len) { 2873784Sphk igz->where = __LINE__; 2883784Sphk return GZ_EOF; 2893784Sphk } 2903784Sphk if (igz->inbuf && igz->idx < (igz->offset + PAGE_SIZE)) { 2913784Sphk return igz->inbuf[(igz->idx++) - igz->offset]; 2923784Sphk } 2933784Sphk if (igz->inbuf) { 2946579Sdg error = vm_map_remove(kernel_map, (vm_offset_t) igz->inbuf, 2956579Sdg (vm_offset_t) igz->inbuf + PAGE_SIZE); 2963784Sphk if (error) { 2973784Sphk igz->where = __LINE__; 2983784Sphk igz->error = error; 2993784Sphk return GZ_EOF; 3003784Sphk } 3013784Sphk } 3026342Sphk igz->offset = igz->idx & ~PAGE_MASK; 3033332Sphk 3043784Sphk error = vm_mmap(kernel_map, /* map */ 3053784Sphk (vm_offset_t *) & igz->inbuf, /* address */ 3063784Sphk PAGE_SIZE, /* size */ 3073784Sphk VM_PROT_READ, /* protection */ 3083784Sphk VM_PROT_READ, /* max protection */ 3093784Sphk 0, /* flags */ 31012130Sdg (caddr_t) igz->ip->vp, /* vnode */ 3113784Sphk igz->offset); /* offset */ 3123784Sphk if (error) { 3133784Sphk igz->where = __LINE__; 3143784Sphk igz->error = error; 3153784Sphk return GZ_EOF; 3163784Sphk } 3173784Sphk return igz->inbuf[(igz->idx++) - igz->offset]; 3183784Sphk} 3193332Sphk 3203784Sphkstatic int 3213784SphkFlush(void *vp, u_char * ptr, u_long siz) 3223784Sphk{ 3233784Sphk struct imgact_gzip *gz = (struct imgact_gzip *) vp; 3243784Sphk u_char *p = ptr, *q; 3253784Sphk int i; 3263348Sphk 3273784Sphk /* First, find a a.out-header */ 3283784Sphk if (gz->output < sizeof gz->a_out) { 3293784Sphk q = (u_char *) & gz->a_out; 3303784Sphk i = min(siz, sizeof gz->a_out - gz->output); 3313784Sphk bcopy(p, q + gz->output, i); 3323784Sphk gz->output += i; 3333784Sphk p += i; 3343784Sphk siz -= i; 3353784Sphk if (gz->output == sizeof gz->a_out) { 3363784Sphk i = do_aout_hdr(gz); 3373784Sphk if (i == -1) { 3383785Sphk if (!gz->where) 3393785Sphk gz->where = __LINE__; 3403784Sphk gz->error = ENOEXEC; 3413784Sphk return ENOEXEC; 3423784Sphk } else if (i) { 3433784Sphk gz->where = __LINE__; 3443784Sphk gz->error = i; 3453784Sphk return ENOEXEC; 3463784Sphk } 3473784Sphk if (gz->file_offset < sizeof gz->a_out) { 3483784Sphk q = (u_char *) gz->virtual_offset + gz->output - gz->file_offset; 3493784Sphk bcopy(&gz->a_out, q, sizeof gz->a_out - gz->file_offset); 3503784Sphk } 3513784Sphk } 3523784Sphk } 3533784Sphk /* Skip over zero-padded first PAGE if needed */ 3543784Sphk if (gz->output < gz->file_offset && (gz->output + siz) > gz->file_offset) { 3553784Sphk i = min(siz, gz->file_offset - gz->output); 3563784Sphk gz->output += i; 3573784Sphk p += i; 3583784Sphk siz -= i; 3593784Sphk } 3603784Sphk if (gz->output >= gz->file_offset && gz->output < gz->file_end) { 3613784Sphk i = min(siz, gz->file_end - gz->output); 3623784Sphk q = (u_char *) gz->virtual_offset + gz->output - gz->file_offset; 3633784Sphk bcopy(p, q, i); 3643784Sphk gz->output += i; 3653784Sphk p += i; 3663784Sphk siz -= i; 3673784Sphk } 3683784Sphk gz->output += siz; 3693784Sphk return 0; 3703332Sphk} 3713332Sphk 3723784Sphk 3733332Sphk/* 3743332Sphk * Tell kern_execve.c about it, with a little help from the linker. 3753332Sphk * Since `const' objects end up in the text segment, TEXT_SET is the 3763332Sphk * correct directive to use. 3773332Sphk */ 3783784Sphk 3793784Sphkstatic const struct execsw gzip_execsw = {exec_gzip_imgact, "gzip"}; 3803332SphkTEXT_SET(execsw_set, gzip_execsw); 381