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exec.c
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exec.c
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#define _GNU_SOURCE
#include <unistd.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "misc.h"
#include "kernel/calls.h"
#include "kernel/random.h"
#include "kernel/errno.h"
#include "fs/fd.h"
#include "kernel/elf.h"
#include "kernel/vdso.h"
#include "tools/ptraceomatic-config.h"
#define ARGV_MAX 32 * PAGE_SIZE
struct exec_args {
// number of arguments
size_t count;
// series of count null-terminated strings, plus an extra null for good measure
const char *args;
};
static inline dword_t align_stack(dword_t sp);
static inline ssize_t user_strlen(dword_t p);
static inline int user_memset(addr_t start, byte_t val, dword_t len);
static inline dword_t copy_string(dword_t sp, const char *string);
static inline dword_t args_copy(dword_t sp, struct exec_args args);
static size_t args_size(struct exec_args args);
static int read_header(struct fd *fd, struct elf_header *header) {
int err;
if (fd->ops->lseek(fd, 0, SEEK_SET))
return _EIO;
if ((err = fd->ops->read(fd, header, sizeof(*header))) != sizeof(*header)) {
if (err < 0)
return _EIO;
return _ENOEXEC;
}
if (memcmp(&header->magic, ELF_MAGIC, sizeof(header->magic)) != 0
|| (header->type != ELF_EXECUTABLE && header->type != ELF_DYNAMIC)
|| header->bitness != ELF_32BIT
|| header->endian != ELF_LITTLEENDIAN
|| header->elfversion1 != 1
|| header->machine != ELF_X86)
return _ENOEXEC;
return 0;
}
static int read_prg_headers(struct fd *fd, struct elf_header header, struct prg_header **ph_out) {
ssize_t ph_size = sizeof(struct prg_header) * header.phent_count;
struct prg_header *ph = malloc(ph_size);
if (ph == NULL)
return _ENOMEM;
if (fd->ops->lseek(fd, header.prghead_off, SEEK_SET) < 0) {
free(ph);
return _EIO;
}
if (fd->ops->read(fd, ph, ph_size) != ph_size) {
free(ph);
if (errno != 0)
return _EIO;
return _ENOEXEC;
}
*ph_out = ph;
return 0;
}
static int load_entry(struct prg_header ph, addr_t bias, struct fd *fd) {
int err;
addr_t addr = ph.vaddr + bias;
addr_t offset = ph.offset;
addr_t memsize = ph.memsize;
addr_t filesize = ph.filesize;
int flags = P_READ;
if (ph.flags & PH_W) flags |= P_WRITE;
if ((err = fd->ops->mmap(fd, current->mem, PAGE(addr),
PAGE_ROUND_UP(filesize + PGOFFSET(addr)),
offset - PGOFFSET(addr), flags, MMAP_PRIVATE)) < 0)
return err;
// TODO find a better place for these to avoid code duplication
mem_pt(current->mem, PAGE(addr))->data->fd = fd_retain(fd);
mem_pt(current->mem, PAGE(addr))->data->file_offset = offset - PGOFFSET(addr);
if (memsize > filesize) {
// put zeroes between addr + filesize and addr + memsize, call that bss
dword_t bss_size = memsize - filesize;
// first zero the tail from the end of the file mapping to the end
// of the load entry or the end of the page, whichever comes first
addr_t file_end = addr + filesize;
dword_t tail_size = PAGE_SIZE - PGOFFSET(file_end);
if (tail_size == PAGE_SIZE)
// if you can calculate tail_size better and not have to do this please let me know
tail_size = 0;
if (tail_size != 0) {
// Unlock and lock the mem because the user functions must be
// called without locking mem.
write_wrunlock(¤t->mem->lock);
user_memset(file_end, 0, tail_size);
write_wrlock(¤t->mem->lock);
}
if (tail_size > bss_size)
tail_size = bss_size;
// then map the pages from after the file mapping up to and including the end of bss
if (bss_size - tail_size != 0)
if ((err = pt_map_nothing(current->mem, PAGE_ROUND_UP(addr + filesize),
PAGE_ROUND_UP(bss_size - tail_size), flags)) < 0)
return err;
}
return 0;
}
static addr_t find_hole_for_elf(struct elf_header *header, struct prg_header *ph) {
struct prg_header *first = NULL, *last = NULL;
for (int i = 0; i < header->phent_count; i++) {
if (ph[i].type == PT_LOAD) {
if (first == NULL)
first = &ph[i];
last = &ph[i];
}
}
pages_t size = 0;
if (first != NULL) {
pages_t a = PAGE_ROUND_UP(last->vaddr + last->memsize);
pages_t b = PAGE(first->vaddr);
size = a - b;
}
return pt_find_hole(current->mem, size) << PAGE_BITS;
}
static int elf_exec(struct fd *fd, const char *file, struct exec_args argv, struct exec_args envp) {
int err = 0;
// read the headers
struct elf_header header;
if ((err = read_header(fd, &header)) < 0)
return err;
struct prg_header *ph;
if ((err = read_prg_headers(fd, header, &ph)) < 0)
return err;
// look for an interpreter
char *interp_name = NULL;
struct fd *interp_fd = NULL;
struct elf_header interp_header;
struct prg_header *interp_ph = NULL;
for (unsigned i = 0; i < header.phent_count; i++) {
if (ph[i].type != PT_INTERP)
continue;
if (interp_name) {
// can't have two interpreters
err = _EINVAL;
goto out_free_interp;
}
interp_name = malloc(ph[i].filesize);
err = _ENOMEM;
if (interp_name == NULL)
goto out_free_ph;
// read the interpreter name out of the file
err = _EIO;
if (fd->ops->lseek(fd, ph[i].offset, SEEK_SET) < 0)
goto out_free_interp;
if (fd->ops->read(fd, interp_name, ph[i].filesize) != ph[i].filesize)
goto out_free_interp;
// open interpreter and read headers
interp_fd = generic_open(interp_name, O_RDONLY, 0);
if (IS_ERR(interp_fd)) {
err = PTR_ERR(interp_fd);
goto out_free_interp;
}
if ((err = read_header(interp_fd, &interp_header)) < 0) {
if (err == _ENOEXEC) err = _ELIBBAD;
goto out_free_interp;
}
if ((err = read_prg_headers(interp_fd, interp_header, &interp_ph)) < 0) {
if (err == _ENOEXEC) err = _ELIBBAD;
goto out_free_interp;
}
}
// free the process's memory.
// from this point on, if any error occurs the process will have to be
// killed before it even starts. please don't be too sad about it, it's
// just a process.
mm_release(current->mm);
task_set_mm(current, mm_new());
write_wrlock(¤t->mem->lock);
current->mm->exefile = fd_retain(fd);
addr_t load_addr = 0; // used for AX_PHDR
bool load_addr_set = false;
addr_t bias = 0; // offset for loading shared libraries as executables
// map dat shit!
for (unsigned i = 0; i < header.phent_count; i++) {
if (ph[i].type != PT_LOAD)
continue;
if (!load_addr_set && header.type == ELF_DYNAMIC) {
// see giant comment in linux/fs/binfmt_elf.c, around line 950
if (interp_name)
bias = 0x56555000; // I have no idea how this number was arrived at
else
bias = find_hole_for_elf(&header, ph);
}
if ((err = load_entry(ph[i], bias, fd)) < 0)
goto beyond_hope;
// load_addr is used to get a value for AX_PHDR et al
if (!load_addr_set) {
load_addr = bias + ph[i].vaddr - ph[i].offset;
load_addr_set = true;
}
// we have to know where the brk starts
addr_t brk = bias + ph[i].vaddr + ph[i].memsize;
if (brk > current->mm->start_brk)
current->mm->start_brk = current->mm->brk = BYTES_ROUND_UP(brk);
}
addr_t entry = bias + header.entry_point;
addr_t interp_base = 0;
if (interp_name) {
// map dat shit! interpreter edition
interp_base = find_hole_for_elf(&interp_header, interp_ph);
for (int i = interp_header.phent_count - 1; i >= 0; i--) {
if (interp_ph[i].type != PT_LOAD)
continue;
if ((err = load_entry(interp_ph[i], interp_base, interp_fd)) < 0)
goto beyond_hope;
}
entry = interp_base + interp_header.entry_point;
}
// map vdso
err = _ENOMEM;
pages_t vdso_pages = sizeof(vdso_data) >> PAGE_BITS;
// FIXME disgusting hack: musl's dynamic linker has a one-page hole, and
// I'd rather not put the vdso in that hole. so find a two-page hole and
// add one.
page_t vdso_page = pt_find_hole(current->mem, vdso_pages + 1);
if (vdso_page == BAD_PAGE)
goto beyond_hope;
vdso_page += 1;
if ((err = pt_map(current->mem, vdso_page, vdso_pages, (void *) vdso_data, 0, 0)) < 0)
goto beyond_hope;
mem_pt(current->mem, vdso_page)->data->name = "[vdso]";
current->mm->vdso = vdso_page << PAGE_BITS;
addr_t vdso_entry = current->mm->vdso + ((struct elf_header *) vdso_data)->entry_point;
// map 3 empty "vvar" pages to satisfy ptraceomatic
page_t vvar_page = pt_find_hole(current->mem, VVAR_PAGES);
if (vvar_page == BAD_PAGE)
goto beyond_hope;
if ((err = pt_map_nothing(current->mem, vvar_page, VVAR_PAGES, 0)) < 0)
goto beyond_hope;
mem_pt(current->mem, vvar_page)->data->name = "[vvar]";
// STACK TIME!
// allocate 1 page of stack at 0xffffd, and let it grow down
if ((err = pt_map_nothing(current->mem, 0xffffd, 1, P_WRITE | P_GROWSDOWN)) < 0)
goto beyond_hope;
// that was the last memory mapping
write_wrunlock(¤t->mem->lock);
dword_t sp = 0xffffe000;
// on 32-bit linux, there's 4 empty bytes at the very bottom of the stack.
// on 64-bit linux, there's 8. make ptraceomatic happy. (a major theme in this file)
sp -= sizeof(void *);
err = _EFAULT;
// first, copy stuff pointed to by argv/envp/auxv
// filename, argc, argv
addr_t file_addr = sp = copy_string(sp, file);
if (sp == 0)
goto beyond_hope;
addr_t envp_addr = sp = args_copy(sp, envp);
if (sp == 0)
goto beyond_hope;
current->mm->argv_end = sp;
addr_t argv_addr = sp = args_copy(sp, argv);
if (sp == 0)
goto beyond_hope;
current->mm->argv_start = sp;
sp = align_stack(sp);
addr_t platform_addr = sp = copy_string(sp, "i686");
if (sp == 0)
goto beyond_hope;
// 16 random bytes so no system call is needed to seed a userspace RNG
char random[16] = {};
get_random(random, sizeof(random)); // if this fails, eh, no one's really using it
addr_t random_addr = sp -= sizeof(random);
if (user_put(sp, random))
goto beyond_hope;
// the way linux aligns the stack at this point is kinda funky
// calculate how much space is needed for argv, envp, and auxv, subtract
// that from sp, then align, then copy argv/envp/auxv from that down
// declare elf aux now so we can know how big it is
struct aux_ent aux[] = {
{AX_SYSINFO, vdso_entry},
{AX_SYSINFO_EHDR, current->mm->vdso},
{AX_HWCAP, 0x00000000}, // suck that
{AX_PAGESZ, PAGE_SIZE},
{AX_CLKTCK, 0x64},
{AX_PHDR, load_addr + header.prghead_off},
{AX_PHENT, sizeof(struct prg_header)},
{AX_PHNUM, header.phent_count},
{AX_BASE, interp_base},
{AX_FLAGS, 0},
{AX_ENTRY, bias + header.entry_point},
{AX_UID, 0},
{AX_EUID, 0},
{AX_GID, 0},
{AX_EGID, 0},
{AX_SECURE, 0},
{AX_RANDOM, random_addr},
{AX_HWCAP2, 0}, // suck that too
{AX_EXECFN, file_addr},
{AX_PLATFORM, platform_addr},
{0, 0}
};
sp -= ((argv.count + 1) + (envp.count + 1) + 1) * sizeof(dword_t);
sp -= sizeof(aux);
sp &=~ 0xf;
// now copy down, start using p so sp is preserved
addr_t p = sp;
// argc
if (user_put(p, argv.count))
return _EFAULT;
p += sizeof(dword_t);
// argv
size_t argc = argv.count;
while (argc-- > 0) {
if (user_put(p, argv_addr))
return _EFAULT;
argv_addr += user_strlen(argv_addr) + 1;
p += sizeof(dword_t); // null terminator
}
p += sizeof(dword_t); // null terminator
// envp
size_t envc = envp.count;
while (envc-- > 0) {
if (user_put(p, envp_addr))
return _EFAULT;
envp_addr += user_strlen(envp_addr) + 1;
p += sizeof(dword_t);
}
p += sizeof(dword_t); // null terminator
// copy auxv
if (user_put(p, aux))
goto beyond_hope;
p += sizeof(aux);
current->mm->stack_start = sp;
current->cpu.esp = sp;
current->cpu.eip = entry;
current->cpu.fcw = 0x37f;
// This code was written when I discovered that the glibc entry point
// interprets edx as the address of a function to call on exit, as
// specified in the ABI. This register is normally set by the dynamic
// linker, so everything works fine until you run a static executable.
current->cpu.eax = 0;
current->cpu.ebx = 0;
current->cpu.ecx = 0;
current->cpu.edx = 0;
current->cpu.esi = 0;
current->cpu.edi = 0;
current->cpu.ebp = 0;
collapse_flags(¤t->cpu);
current->cpu.eflags = 0;
err = 0;
out_free_interp:
if (interp_name != NULL)
free(interp_name);
if (interp_fd != NULL && !IS_ERR(interp_fd))
fd_close(interp_fd);
if (interp_ph != NULL)
free(interp_ph);
out_free_ph:
free(ph);
return err;
beyond_hope:
// TODO force sigsegv
write_wrunlock(¤t->mem->lock);
goto out_free_interp;
}
static size_t args_size(struct exec_args args) {
const char *args_end = args.args;
for (size_t i = 0; i < args.count; i++) {
args_end += strlen(args_end) + 1;
}
// don't forget the very last null terminator
assert(args_end[0] == '\0');
args_end++;
return args_end - args.args;
}
static inline dword_t align_stack(addr_t sp) {
return sp &~ 0xf;
}
static inline dword_t copy_string(addr_t sp, const char *string) {
sp -= strlen(string) + 1;
if (user_write_string(sp, string))
return 0;
return sp;
}
static inline dword_t args_copy(addr_t sp, struct exec_args args) {
size_t size = args_size(args);
sp -= size;
if (user_write(sp, args.args, size))
return 0;
return sp;
}
static inline ssize_t user_strlen(addr_t p) {
size_t i = 0;
char c;
do {
if (user_get(p + i, c))
return -1;
i++;
} while (c != '\0');
return i - 1;
}
static inline int user_memset(addr_t start, byte_t val, dword_t len) {
while (len--)
if (user_put(start++, val))
return 1;
return 0;
}
static int format_exec(struct fd *fd, const char *file, struct exec_args argv, struct exec_args envp) {
int err = elf_exec(fd, file, argv, envp);
if (err != _ENOEXEC)
return err;
// other formats would go here
return _ENOEXEC;
}
static int shebang_exec(struct fd *fd, const char *file, struct exec_args argv, struct exec_args envp) {
// read the first 128 bytes to get the shebang line out of
if (fd->ops->lseek(fd, 0, SEEK_SET))
return _EIO;
char header[128];
int size = fd->ops->read(fd, header, sizeof(header) - 1);
if (size < 0)
return _EIO;
header[size] = '\0';
// only look at the first line
char *newline = strchr(header, '\n');
if (newline == NULL)
return _ENOEXEC;
*newline = '\0';
// format: #![spaces]interpreter[spaces]argument[spaces]
char *p = header;
if (p[0] != '#' || p[1] != '!')
return _ENOEXEC;
p += 2;
while (*p == ' ')
p++;
if (*p == '\0')
return _ENOEXEC;
char *interpreter = p;
while (*p != ' ' && *p != '\0')
p++;
if (*p != '\0') {
*p++ = '\0';
while (*p == ' ')
p++;
}
char *argument = p;
// strip trailing whitespace
p = strchr(p, '\0') - 1;
while (*p == ' ')
*p-- = '\0';
if (*argument == '\0')
argument = NULL;
struct exec_args argv_rest = {
.count = argv.count - 1,
.args = argv.args + strlen(argv.args) + 1,
};
size_t args_rest_size = args_size(argv_rest);
size_t extra_args_size = strlen(interpreter) + 1 + strlen(file) + 1;
if (argument)
extra_args_size += strlen(argument) + 1;
if (args_rest_size + extra_args_size >= ARGV_MAX)
return _E2BIG;
char new_argv_buf[ARGV_MAX];
struct exec_args new_argv = {.args = new_argv_buf};
size_t n = 0;
strcpy(new_argv_buf, interpreter);
new_argv.count++;
n += strlen(interpreter) + 1;
if (argument) {
strcpy(new_argv_buf + n, argument);
new_argv.count++;
n += strlen(argument) + 1;
}
strcpy(new_argv_buf + n, file);
n += strlen(file) + 1;
new_argv.count++;
memcpy(new_argv_buf + n, argv_rest.args, args_rest_size);
new_argv.count += argv_rest.count;
struct fd *interpreter_fd = generic_open(interpreter, O_RDONLY_, 0);
if (IS_ERR(interpreter_fd))
return PTR_ERR(interpreter_fd);
int err = format_exec(interpreter_fd, interpreter, new_argv, envp);
fd_close(interpreter_fd);
return err;
}
int __do_execve(const char *file, struct exec_args argv, struct exec_args envp) {
struct fd *fd = generic_open(file, O_RDONLY, 0);
if (IS_ERR(fd))
return PTR_ERR(fd);
struct statbuf stat;
int err = fd->mount->fs->fstat(fd, &stat);
if (err < 0) {
fd_close(fd);
return err;
}
// if nobody has permission to execute, it should be safe to not execute
if (!(stat.mode & 0111)) {
fd_close(fd);
return _EACCES;
}
err = format_exec(fd, file, argv, envp);
if (err == _ENOEXEC)
err = shebang_exec(fd, file, argv, envp);
fd_close(fd);
if (err < 0)
return err;
// setuid/setgid
if (stat.mode & S_ISUID) {
current->suid = current->euid;
current->euid = stat.uid;
}
if (stat.mode & S_ISGID) {
current->sgid = current->egid;
current->egid = stat.gid;
}
// save current->comm
lock(¤t->general_lock);
const char *basename = strrchr(file, '/');
if (basename == NULL)
basename = file;
else
basename++;
strncpy(current->comm, basename, sizeof(current->comm));
unlock(¤t->general_lock);
// set the thread name
char threadname[16];
strncpy(threadname, current->comm, sizeof(threadname)-1);
threadname[15] = '\0';
set_thread_name(threadname);
// cloexec
// consider putting this in fd.c?
fdtable_do_cloexec(current->files);
// reset signal handlers
lock(¤t->sighand->lock);
for (int sig = 0; sig < NUM_SIGS; sig++) {
struct sigaction_ *action = ¤t->sighand->action[sig];
if (action->handler != SIG_IGN_)
action->handler = SIG_DFL_;
}
current->sighand->altstack = 0;
unlock(¤t->sighand->lock);
current->did_exec = true;
vfork_notify(current);
return 0;
}
int do_execve(const char *file, size_t argc, const char *argv_p, const char *envp_p) {
struct exec_args argv = {.count = argc, .args = argv_p};
struct exec_args envp = {.args = envp_p};
while (*envp_p != '\0') {
envp_p += strlen(envp_p) + 1;
envp.count++;
}
return __do_execve(file, argv, envp);
}
static ssize_t user_read_string_array(addr_t addr, char *buf, size_t max) {
size_t i = 0;
size_t p = 0;
for (;;) {
addr_t str_addr;
if (user_get(addr + i * sizeof(addr_t), str_addr))
return _EFAULT;
if (str_addr == 0)
break;
size_t str_p = 0;
for (;;) {
if (p >= max)
return _E2BIG;
if (user_get(str_addr + str_p, buf[p]))
return _EFAULT;
str_p++;
p++;
if (buf[p - 1] == '\0')
break;
}
i++;
}
if (p >= max)
return _E2BIG;
buf[p] = '\0';
return i;
}
dword_t sys_execve(addr_t filename_addr, addr_t argv_addr, addr_t envp_addr) {
char filename[MAX_PATH];
if (user_read_string(filename_addr, filename, sizeof(filename)))
return _EFAULT;
int err = _ENOMEM;
char *argv = malloc(ARGV_MAX);
if (argv == NULL)
goto err_free_argv;
ssize_t argc = user_read_string_array(argv_addr, argv, ARGV_MAX);
if (argc < 0) {
err = argc;
goto err_free_argv;
}
char *envp = malloc(ARGV_MAX);
if (envp == NULL)
goto err_free_envp;
err = user_read_string_array(envp_addr, envp, ARGV_MAX);
if (err < 0)
goto err_free_envp;
STRACE("execve(\"%.1000s\", {", filename);
const char *args = argv;
while (*args != '\0') {
STRACE("\"%.1000s\", ", args);
args += strlen(args) + 1;
}
STRACE("}, {");
args = envp;
while (*args != '\0') {
STRACE("\"%.1000s\", ", args);
args += strlen(args) + 1;
}
STRACE("})");
return do_execve(filename, argc, argv, envp);
err_free_envp:
free(envp);
err_free_argv:
free(argv);
return err;
}