imgact_gzip.c revision 15538
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 * 915538Sphk * $Id: imgact_gzip.c,v 1.21 1996/05/01 02:42:50 bde 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 243784Sphk#include <sys/param.h> 253332Sphk#include <sys/exec.h> 263332Sphk#include <sys/imgact.h> 273332Sphk#include <sys/imgact_aout.h> 283332Sphk#include <sys/kernel.h> 293507Scsgr#include <sys/mman.h> 3015494Sbde#include <sys/proc.h> 313507Scsgr#include <sys/resourcevar.h> 323332Sphk#include <sys/sysent.h> 333507Scsgr#include <sys/systm.h> 3415494Sbde#include <sys/vnode.h> 353784Sphk#include <sys/inflate.h> 363332Sphk 373332Sphk#include <vm/vm.h> 3812662Sdg#include <vm/vm_param.h> 3912662Sdg#include <vm/vm_prot.h> 4012662Sdg#include <vm/lock.h> 4112662Sdg#include <vm/pmap.h> 4212662Sdg#include <vm/vm_map.h> 433332Sphk#include <vm/vm_kern.h> 4412662Sdg#include <vm/vm_extern.h> 453332Sphk 463784Sphkstruct imgact_gzip { 473784Sphk struct image_params *ip; 483784Sphk struct exec a_out; 493784Sphk int error; 503784Sphk int where; 513784Sphk u_char *inbuf; 523784Sphk u_long offset; 533784Sphk u_long output; 543784Sphk u_long len; 553784Sphk int idx; 563784Sphk u_long virtual_offset, file_offset, file_end, bss_size; 573784Sphk}; 583784Sphk 5912568Sbdestatic int exec_gzip_imgact __P((struct image_params *imgp)); 603784Sphkstatic int NextByte __P((void *vp)); 613784Sphkstatic int do_aout_hdr __P((struct imgact_gzip *)); 623784Sphkstatic int Flush __P((void *vp, u_char *, u_long siz)); 633784Sphk 6412568Sbdestatic int 6512130Sdgexec_gzip_imgact(imgp) 6612130Sdg struct image_params *imgp; 673332Sphk{ 683784Sphk int error, error2 = 0; 6912130Sdg u_char *p = (u_char *) imgp->image_header; 703784Sphk struct imgact_gzip igz; 713784Sphk struct inflate infl; 723332Sphk 733348Sphk /* If these four are not OK, it isn't a gzip file */ 743784Sphk if (p[0] != 0x1f) 753784Sphk return -1; /* 0 Simply magic */ 763784Sphk if (p[1] != 0x8b) 773784Sphk return -1; /* 1 Simply magic */ 783784Sphk if (p[2] != 0x08) 793784Sphk return -1; /* 2 Compression method */ 803784Sphk if (p[9] != 0x03) 813784Sphk return -1; /* 9 OS compressed on */ 823332Sphk 833784Sphk /* 843784Sphk * If this one contains anything but a comment or a filename marker, 853784Sphk * we don't want to chew on it 863348Sphk */ 873784Sphk if (p[3] & ~(0x18)) 883784Sphk return ENOEXEC; /* 3 Flags */ 893332Sphk 903348Sphk /* These are of no use to us */ 913784Sphk /* 4-7 Timestamp */ 923784Sphk /* 8 Extra flags */ 933348Sphk 943784Sphk bzero(&igz, sizeof igz); 953784Sphk bzero(&infl, sizeof infl); 963784Sphk infl.gz_private = (void *) &igz; 973784Sphk infl.gz_input = NextByte; 983784Sphk infl.gz_output = Flush; 993332Sphk 10012130Sdg igz.ip = imgp; 1013784Sphk igz.idx = 10; 1023353Sphk 1033784Sphk if (p[3] & 0x08) { /* skip a filename */ 1043784Sphk while (p[igz.idx++]) 1053784Sphk if (igz.idx >= PAGE_SIZE) 1063784Sphk return ENOEXEC; 1073348Sphk } 1083784Sphk if (p[3] & 0x10) { /* skip a comment */ 1093784Sphk while (p[igz.idx++]) 1103784Sphk if (igz.idx >= PAGE_SIZE) 1113784Sphk return ENOEXEC; 1123348Sphk } 1133784Sphk igz.len = igz.ip->attr->va_size; 1143332Sphk 1153784Sphk error = inflate(&infl); 1163348Sphk 1173784Sphk if (igz.inbuf) { 1183784Sphk error2 = 1196579Sdg vm_map_remove(kernel_map, (vm_offset_t) igz.inbuf, 1206579Sdg (vm_offset_t) igz.inbuf + PAGE_SIZE); 1213332Sphk } 1223784Sphk if (igz.error || error || error2) { 1233784Sphk printf("Output=%lu ", igz.output); 1243784Sphk printf("Inflate_error=%d igz.error=%d error2=%d where=%d\n", 1253784Sphk error, igz.error, error2, igz.where); 1263348Sphk } 1273784Sphk if (igz.error) 1283784Sphk return igz.error; 1293784Sphk if (error) 1303784Sphk return ENOEXEC; 1318876Srgrimes if (error2) 1323784Sphk return error2; 1333784Sphk return 0; 1343332Sphk} 1353332Sphk 1363784Sphkstatic int 1373784Sphkdo_aout_hdr(struct imgact_gzip * gz) 1383332Sphk{ 1393784Sphk int error; 1403784Sphk struct vmspace *vmspace = gz->ip->proc->p_vmspace; 14114703Sbde vm_offset_t vmaddr; 1423332Sphk 1433784Sphk /* 1443784Sphk * Set file/virtual offset based on a.out variant. We do two cases: 1453784Sphk * host byte order and network byte order (for NetBSD compatibility) 1463784Sphk */ 1473784Sphk switch ((int) (gz->a_out.a_magic & 0xffff)) { 1483332Sphk case ZMAGIC: 1493784Sphk gz->virtual_offset = 0; 1503784Sphk if (gz->a_out.a_text) { 15115538Sphk gz->file_offset = PAGE_SIZE; 1523784Sphk } else { 1533784Sphk /* Bill's "screwball mode" */ 1543784Sphk gz->file_offset = 0; 1553784Sphk } 1563784Sphk break; 1573332Sphk case QMAGIC: 15815538Sphk gz->virtual_offset = PAGE_SIZE; 1593784Sphk gz->file_offset = 0; 1603784Sphk break; 1613332Sphk default: 1623784Sphk /* NetBSD compatibility */ 1633784Sphk switch ((int) (ntohl(gz->a_out.a_magic) & 0xffff)) { 1643784Sphk case ZMAGIC: 1653784Sphk case QMAGIC: 16615538Sphk gz->virtual_offset = PAGE_SIZE; 1673784Sphk gz->file_offset = 0; 1683784Sphk break; 1693784Sphk default: 1703784Sphk gz->where = __LINE__; 1713784Sphk return (-1); 1723784Sphk } 1733332Sphk } 1743332Sphk 17515538Sphk gz->bss_size = roundup(gz->a_out.a_bss, PAGE_SIZE); 1763332Sphk 1773784Sphk /* 1783784Sphk * Check various fields in header for validity/bounds. 1793784Sphk */ 1803784Sphk if ( /* entry point must lay with text region */ 1813784Sphk gz->a_out.a_entry < gz->virtual_offset || 1823784Sphk gz->a_out.a_entry >= gz->virtual_offset + gz->a_out.a_text || 1833332Sphk 1843332Sphk /* text and data size must each be page rounded */ 18515538Sphk gz->a_out.a_text & PAGE_MASK || gz->a_out.a_data & PAGE_MASK) { 1863784Sphk gz->where = __LINE__; 1873784Sphk return (-1); 1883784Sphk } 1893784Sphk /* 1903784Sphk * text/data/bss must not exceed limits 1913784Sphk */ 1923784Sphk if ( /* text can't exceed maximum text size */ 1933784Sphk gz->a_out.a_text > MAXTSIZ || 1943332Sphk 1953332Sphk /* data + bss can't exceed maximum data size */ 1963784Sphk gz->a_out.a_data + gz->bss_size > MAXDSIZ || 1973332Sphk 1983332Sphk /* data + bss can't exceed rlimit */ 1993784Sphk gz->a_out.a_data + gz->bss_size > 2003332Sphk gz->ip->proc->p_rlimit[RLIMIT_DATA].rlim_cur) { 2013784Sphk gz->where = __LINE__; 2023784Sphk return (ENOMEM); 2033784Sphk } 2043784Sphk /* Find out how far we should go */ 2053784Sphk gz->file_end = gz->file_offset + gz->a_out.a_text + gz->a_out.a_data; 2063332Sphk 2073784Sphk /* copy in arguments and/or environment from old process */ 2083784Sphk error = exec_extract_strings(gz->ip); 2093784Sphk if (error) { 2103784Sphk gz->where = __LINE__; 2113784Sphk return (error); 2123784Sphk } 2133784Sphk /* 2143784Sphk * Destroy old process VM and create a new one (with a new stack) 2153784Sphk */ 2163784Sphk exec_new_vmspace(gz->ip); 2173348Sphk 2183784Sphk vmaddr = gz->virtual_offset; 2193332Sphk 2203784Sphk error = vm_mmap(&vmspace->vm_map, /* map */ 2213784Sphk &vmaddr,/* address */ 2223784Sphk gz->a_out.a_text, /* size */ 2233784Sphk VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, /* protection */ 2243784Sphk VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, 2253784Sphk MAP_ANON | MAP_FIXED, /* flags */ 2263784Sphk 0, /* vnode */ 2273784Sphk 0); /* offset */ 2283332Sphk 2293784Sphk if (error) { 2303784Sphk gz->where = __LINE__; 2313784Sphk return (error); 2323784Sphk } 2333784Sphk vmaddr = gz->virtual_offset + gz->a_out.a_text; 2343332Sphk 2353784Sphk /* 2363784Sphk * Map data read/write (if text is 0, assume text is in data area 2373784Sphk * [Bill's screwball mode]) 2383784Sphk */ 2393332Sphk 2403784Sphk error = vm_mmap(&vmspace->vm_map, 2413784Sphk &vmaddr, 2423784Sphk gz->a_out.a_data, 2433784Sphk VM_PROT_READ | VM_PROT_WRITE | (gz->a_out.a_text ? 0 : VM_PROT_EXECUTE), 2443784Sphk VM_PROT_ALL, MAP_ANON | MAP_FIXED, 2453784Sphk 0, 2463784Sphk 0); 2473332Sphk 2483784Sphk if (error) { 2493784Sphk gz->where = __LINE__; 2503784Sphk return (error); 2513784Sphk } 2526579Sdg if (gz->bss_size != 0) { 2536579Sdg /* 25414087Sphk * Allocate demand-zeroed area for uninitialized data. 25514087Sphk * "bss" = 'block started by symbol' - named after the 25614087Sphk * IBM 7090 instruction of the same name. 2576579Sdg */ 25814087Sphk vmaddr = gz->virtual_offset + gz->a_out.a_text + 25914087Sphk gz->a_out.a_data; 26014087Sphk error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, 26114087Sphk gz->bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0); 2626579Sdg if (error) { 2636579Sdg gz->where = __LINE__; 2646579Sdg return (error); 2656579Sdg } 2663784Sphk } 2673784Sphk /* Fill in process VM information */ 2683784Sphk vmspace->vm_tsize = gz->a_out.a_text >> PAGE_SHIFT; 2693784Sphk vmspace->vm_dsize = (gz->a_out.a_data + gz->bss_size) >> PAGE_SHIFT; 2703784Sphk vmspace->vm_taddr = (caddr_t) gz->virtual_offset; 2713784Sphk vmspace->vm_daddr = (caddr_t) gz->virtual_offset + gz->a_out.a_text; 2723332Sphk 2733784Sphk /* Fill in image_params */ 2743784Sphk gz->ip->interpreted = 0; 2753784Sphk gz->ip->entry_addr = gz->a_out.a_entry; 2763332Sphk 2773784Sphk gz->ip->proc->p_sysent = &aout_sysvec; 2783332Sphk 2793784Sphk return 0; 2803784Sphk} 2813332Sphk 2823784Sphkstatic int 2833784SphkNextByte(void *vp) 2843784Sphk{ 2853784Sphk int error; 2863784Sphk struct imgact_gzip *igz = (struct imgact_gzip *) vp; 2873332Sphk 2883784Sphk if (igz->idx >= igz->len) { 2893784Sphk igz->where = __LINE__; 2903784Sphk return GZ_EOF; 2913784Sphk } 2923784Sphk if (igz->inbuf && igz->idx < (igz->offset + PAGE_SIZE)) { 2933784Sphk return igz->inbuf[(igz->idx++) - igz->offset]; 2943784Sphk } 2953784Sphk if (igz->inbuf) { 2966579Sdg error = vm_map_remove(kernel_map, (vm_offset_t) igz->inbuf, 2976579Sdg (vm_offset_t) igz->inbuf + PAGE_SIZE); 2983784Sphk if (error) { 2993784Sphk igz->where = __LINE__; 3003784Sphk igz->error = error; 3013784Sphk return GZ_EOF; 3023784Sphk } 3033784Sphk } 3046342Sphk igz->offset = igz->idx & ~PAGE_MASK; 3053332Sphk 3063784Sphk error = vm_mmap(kernel_map, /* map */ 3073784Sphk (vm_offset_t *) & igz->inbuf, /* address */ 3083784Sphk PAGE_SIZE, /* size */ 3093784Sphk VM_PROT_READ, /* protection */ 3103784Sphk VM_PROT_READ, /* max protection */ 3113784Sphk 0, /* flags */ 31212130Sdg (caddr_t) igz->ip->vp, /* vnode */ 3133784Sphk igz->offset); /* offset */ 3143784Sphk if (error) { 3153784Sphk igz->where = __LINE__; 3163784Sphk igz->error = error; 3173784Sphk return GZ_EOF; 3183784Sphk } 3193784Sphk return igz->inbuf[(igz->idx++) - igz->offset]; 3203784Sphk} 3213332Sphk 3223784Sphkstatic int 3233784SphkFlush(void *vp, u_char * ptr, u_long siz) 3243784Sphk{ 3253784Sphk struct imgact_gzip *gz = (struct imgact_gzip *) vp; 3263784Sphk u_char *p = ptr, *q; 3273784Sphk int i; 3283348Sphk 3293784Sphk /* First, find a a.out-header */ 3303784Sphk if (gz->output < sizeof gz->a_out) { 3313784Sphk q = (u_char *) & gz->a_out; 3323784Sphk i = min(siz, sizeof gz->a_out - gz->output); 3333784Sphk bcopy(p, q + gz->output, i); 3343784Sphk gz->output += i; 3353784Sphk p += i; 3363784Sphk siz -= i; 3373784Sphk if (gz->output == sizeof gz->a_out) { 3383784Sphk i = do_aout_hdr(gz); 3393784Sphk if (i == -1) { 3403785Sphk if (!gz->where) 3413785Sphk gz->where = __LINE__; 3423784Sphk gz->error = ENOEXEC; 3433784Sphk return ENOEXEC; 3443784Sphk } else if (i) { 3453784Sphk gz->where = __LINE__; 3463784Sphk gz->error = i; 3473784Sphk return ENOEXEC; 3483784Sphk } 3493784Sphk if (gz->file_offset < sizeof gz->a_out) { 3503784Sphk q = (u_char *) gz->virtual_offset + gz->output - gz->file_offset; 3513784Sphk bcopy(&gz->a_out, q, sizeof gz->a_out - gz->file_offset); 3523784Sphk } 3533784Sphk } 3543784Sphk } 3553784Sphk /* Skip over zero-padded first PAGE if needed */ 3563784Sphk if (gz->output < gz->file_offset && (gz->output + siz) > gz->file_offset) { 3573784Sphk i = min(siz, gz->file_offset - gz->output); 3583784Sphk gz->output += i; 3593784Sphk p += i; 3603784Sphk siz -= i; 3613784Sphk } 3623784Sphk if (gz->output >= gz->file_offset && gz->output < gz->file_end) { 3633784Sphk i = min(siz, gz->file_end - gz->output); 3643784Sphk q = (u_char *) gz->virtual_offset + gz->output - gz->file_offset; 3653784Sphk bcopy(p, q, i); 3663784Sphk gz->output += i; 3673784Sphk p += i; 3683784Sphk siz -= i; 3693784Sphk } 3703784Sphk gz->output += siz; 3713784Sphk return 0; 3723332Sphk} 3733332Sphk 3743784Sphk 3753332Sphk/* 3763332Sphk * Tell kern_execve.c about it, with a little help from the linker. 3773332Sphk * Since `const' objects end up in the text segment, TEXT_SET is the 3783332Sphk * correct directive to use. 3793332Sphk */ 3803784Sphk 3813784Sphkstatic const struct execsw gzip_execsw = {exec_gzip_imgact, "gzip"}; 3823332SphkTEXT_SET(execsw_set, gzip_execsw); 383