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sgx_main.c
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/* FIXME: Sorting+re-grouping includes here causes tons of
* "../../../include/sysdeps/generic/ldsodefs.h:30:32: error: unknown type name ‘Elf__ELF_NATIVE_CLASS_Addr’
* #define ElfW(type) _ElfW(Elf, __ELF_NATIVE_CLASS, type)"
* errors.
*/
#include "pal_linux.h"
#include "pal_linux_error.h"
#include "pal_rtld.h"
#include "hex.h"
#include "gdb_integration/sgx_gdb.h"
#include "linux_utils.h"
#include "rpc_queue.h"
#include "sgx_api.h"
#include "sgx_enclave.h"
#include "sgx_internal.h"
#include "sgx_tls.h"
#include <asm/errno.h>
#include <asm/fcntl.h>
#include <asm/socket.h>
#include <ctype.h>
#include <linux/fs.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <sys/auxv.h>
#include "sysdep.h"
#include "sysdeps/generic/ldsodefs.h"
size_t g_page_size = PRESET_PAGESIZE;
char* g_pal_loader_path = NULL;
char* g_libpal_path = NULL;
struct pal_enclave g_pal_enclave;
static char* resolve_uri(const char* uri, const char** errstring) {
if (!strstartswith(uri, URI_PREFIX_FILE)) {
*errstring = "Invalid URI";
return NULL;
}
char path_buf[URI_MAX];
size_t len = URI_MAX;
int ret = get_norm_path(uri + 5, path_buf, &len);
if (ret < 0) {
*errstring = "Invalid URI";
return NULL;
}
return alloc_concat(URI_PREFIX_FILE, URI_PREFIX_FILE_LEN, path_buf, len);
}
static int scan_enclave_binary(int fd, unsigned long* base, unsigned long* size,
unsigned long* entry) {
int ret = 0;
if (IS_ERR(ret = INLINE_SYSCALL(lseek, 3, fd, 0, SEEK_SET)))
return -ERRNO(ret);
char filebuf[FILEBUF_SIZE];
ret = INLINE_SYSCALL(read, 3, fd, filebuf, FILEBUF_SIZE);
if (IS_ERR(ret))
return -ERRNO(ret);
if ((size_t)ret < sizeof(ElfW(Ehdr)))
return -ENOEXEC;
const ElfW(Ehdr)* header = (void*)filebuf;
const ElfW(Phdr)* phdr = (void*)filebuf + header->e_phoff;
const ElfW(Phdr)* ph;
if (memcmp(header->e_ident, ELFMAG, SELFMAG) != 0)
return -ENOEXEC;
struct loadcmd {
ElfW(Addr) mapstart, mapend;
} loadcmds[16], *c;
int nloadcmds = 0;
for (ph = phdr; ph < &phdr[header->e_phnum]; ph++)
if (ph->p_type == PT_LOAD) {
if (nloadcmds == 16)
return -EINVAL;
c = &loadcmds[nloadcmds++];
c->mapstart = ALLOC_ALIGN_DOWN(ph->p_vaddr);
c->mapend = ALLOC_ALIGN_UP(ph->p_vaddr + ph->p_memsz);
}
*base = loadcmds[0].mapstart;
*size = loadcmds[nloadcmds - 1].mapend - loadcmds[0].mapstart;
if (entry)
*entry = header->e_entry;
return 0;
}
static int load_enclave_binary(sgx_arch_secs_t* secs, int fd, unsigned long base,
unsigned long prot) {
int ret = 0;
if (IS_ERR(ret = INLINE_SYSCALL(lseek, 3, fd, 0, SEEK_SET)))
return -ERRNO(ret);
char filebuf[FILEBUF_SIZE];
ret = INLINE_SYSCALL(read, 3, fd, filebuf, FILEBUF_SIZE);
if (IS_ERR(ret))
return -ERRNO(ret);
const ElfW(Ehdr)* header = (void*)filebuf;
const ElfW(Phdr)* phdr = (void*)filebuf + header->e_phoff;
const ElfW(Phdr)* ph;
struct loadcmd {
ElfW(Addr) mapstart, mapend, datastart, dataend, allocend;
unsigned int mapoff;
int prot;
} loadcmds[16], *c;
int nloadcmds = 0;
for (ph = phdr; ph < &phdr[header->e_phnum]; ph++)
if (ph->p_type == PT_LOAD) {
if (nloadcmds == 16)
return -EINVAL;
c = &loadcmds[nloadcmds++];
c->mapstart = ALLOC_ALIGN_DOWN(ph->p_vaddr);
c->mapend = ALLOC_ALIGN_UP(ph->p_vaddr + ph->p_filesz);
c->datastart = ph->p_vaddr;
c->dataend = ph->p_vaddr + ph->p_filesz;
c->allocend = ph->p_vaddr + ph->p_memsz;
c->mapoff = ALLOC_ALIGN_DOWN(ph->p_offset);
c->prot = (ph->p_flags & PF_R ? PROT_READ : 0) | (ph->p_flags & PF_W ? PROT_WRITE : 0) |
(ph->p_flags & PF_X ? PROT_EXEC : 0) | prot;
}
base -= loadcmds[0].mapstart;
for (c = loadcmds; c < &loadcmds[nloadcmds]; c++) {
ElfW(Addr) zero = c->dataend;
ElfW(Addr) zeroend = ALLOC_ALIGN_UP(c->allocend);
ElfW(Addr) zeropage = ALLOC_ALIGN_UP(zero);
if (zeroend < zeropage)
zeropage = zeroend;
if (c->mapend > c->mapstart) {
void* addr = (void*)INLINE_SYSCALL(mmap, 6, NULL, c->mapend - c->mapstart,
PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FILE, fd,
c->mapoff);
if (IS_ERR_P(addr))
return -ERRNO_P(addr);
if (c->datastart > c->mapstart)
memset(addr, 0, c->datastart - c->mapstart);
if (zeropage > zero)
memset(addr + zero - c->mapstart, 0, zeropage - zero);
ret = add_pages_to_enclave(secs, (void*)base + c->mapstart, addr,
c->mapend - c->mapstart,
SGX_PAGE_REG, c->prot, /*skip_eextend=*/false,
(c->prot & PROT_EXEC) ? "code" : "data");
INLINE_SYSCALL(munmap, 2, addr, c->mapend - c->mapstart);
if (ret < 0)
return ret;
}
if (zeroend > zeropage) {
ret = add_pages_to_enclave(secs, (void*)base + zeropage, NULL, zeroend - zeropage,
SGX_PAGE_REG, c->prot, false, "bss");
if (ret < 0)
return ret;
}
}
return 0;
}
static int initialize_enclave(struct pal_enclave* enclave) {
int ret = 0;
int enclave_image = -1;
sgx_arch_token_t enclave_token;
sgx_arch_enclave_css_t enclave_sigstruct;
sgx_arch_secs_t enclave_secs;
unsigned long enclave_entry_addr;
unsigned long enclave_heap_min;
int enclave_mem = -1;
/* this array may overflow the stack, so we allocate it in BSS */
static void* tcs_addrs[MAX_DBG_THREADS];
enclave_image = INLINE_SYSCALL(open, 3, enclave->libpal_uri + URI_PREFIX_FILE_LEN, O_RDONLY, 0);
if (IS_ERR(enclave_image)) {
SGX_DBG(DBG_E, "Cannot find enclave image: %s\n", enclave->libpal_uri);
ret = -ERRNO(enclave_image);
goto out;
}
char cfgbuf[CONFIG_MAX];
/* Reading sgx.enclave_size from manifest */
if (get_config(enclave->config, "sgx.enclave_size", cfgbuf, sizeof(cfgbuf)) <= 0) {
SGX_DBG(DBG_E, "Enclave size is not specified\n");
ret = -EINVAL;
goto out;
}
enclave->size = parse_size_str(cfgbuf);
if (!enclave->size || !IS_POWER_OF_2(enclave->size)) {
SGX_DBG(DBG_E, "Enclave size not a power of two (an SGX-imposed requirement)\n");
ret = -EINVAL;
goto out;
}
/* Reading sgx.thread_num from manifest */
if (get_config(enclave->config, "sgx.thread_num", cfgbuf, sizeof(cfgbuf)) > 0) {
enclave->thread_num = parse_size_str(cfgbuf);
if (enclave->thread_num > MAX_DBG_THREADS) {
SGX_DBG(DBG_E, "Too many threads to debug\n");
ret = -EINVAL;
goto out;
}
} else {
enclave->thread_num = 1;
}
if (get_config(enclave->config, "sgx.rpc_thread_num", cfgbuf, sizeof(cfgbuf)) > 0) {
enclave->rpc_thread_num = parse_size_str(cfgbuf);
if (enclave->rpc_thread_num > MAX_RPC_THREADS) {
SGX_DBG(DBG_E, "Too many RPC threads specified\n");
ret = -EINVAL;
goto out;
}
if (enclave->rpc_thread_num && enclave->thread_num > RPC_QUEUE_SIZE) {
SGX_DBG(DBG_E,
"Too many threads for exitless feature (more than capacity of RPC queue)\n");
ret = -EINVAL;
goto out;
}
} else {
enclave->rpc_thread_num = 0; /* by default, do not use exitless feature */
}
if (get_config(enclave->config, "sgx.static_address", cfgbuf, sizeof(cfgbuf)) > 0
&& cfgbuf[0] == '1') {
/* executable is static, i.e. it is non-PIE: enclave base address must cover code segment
* loaded at 0x400000, and heap cannot start at zero (modern OSes do not allow this) */
enclave->baseaddr = DEFAULT_ENCLAVE_BASE;
enclave_heap_min = DEFAULT_HEAP_MIN;
} else {
/* executable is not static, i.e. it is PIE: enclave base address can be arbitrary (we
* choose it same as enclave_size), and heap can start immediately at this base address */
enclave->baseaddr = enclave->size;
enclave_heap_min = 0;
}
if (get_config(enclave->config, "sgx.enable_stats", cfgbuf, sizeof(cfgbuf)) > 0 &&
cfgbuf[0] == '1') {
g_sgx_enable_stats = true;
}
ret = read_enclave_token(enclave->token, &enclave_token);
if (ret < 0) {
SGX_DBG(DBG_E, "Reading enclave token failed: %d\n", -ret);
goto out;
}
enclave->pal_sec.enclave_attributes = enclave_token.body.attributes;
ret = read_enclave_sigstruct(enclave->sigfile, &enclave_sigstruct);
if (ret < 0) {
SGX_DBG(DBG_E, "Reading enclave sigstruct failed: %d\n", -ret);
goto out;
}
memset(&enclave_secs, 0, sizeof(enclave_secs));
enclave_secs.base = enclave->baseaddr;
enclave_secs.size = enclave->size;
ret = create_enclave(&enclave_secs, &enclave_token);
if (ret < 0) {
SGX_DBG(DBG_E, "Creating enclave failed: %d\n", -ret);
goto out;
}
enclave->ssaframesize = enclave_secs.ssa_frame_size * g_page_size;
struct stat stat;
ret = INLINE_SYSCALL(fstat, 2, enclave->manifest, &stat);
if (IS_ERR(ret)) {
SGX_DBG(DBG_E, "Reading manifest file's size failed: %d\n", -ret);
ret = -ERRNO(ret);
goto out;
}
int manifest_size = stat.st_size;
/* Start populating enclave memory */
struct mem_area {
const char* desc;
bool skip_eextend;
int fd;
bool is_binary; /* only meaningful if fd != -1 */
unsigned long addr, size, prot;
enum sgx_page_type type;
};
/*
* 10 for manifest, SSA, TCS, etc
* + enclave->thread_num for normal stack
* + enclave->thread_num for signal stack
*/
int area_num_max = 10 + enclave->thread_num * 2;
struct mem_area* areas = __alloca(sizeof(areas[0]) * area_num_max);
int area_num = 0;
/* The manifest needs to be allocated at the upper end of the enclave
* memory. That's used by pal_linux_main to find the manifest area. So add
* it first to the list with memory areas. */
areas[area_num] = (struct mem_area){.desc = "manifest",
.skip_eextend = false,
.fd = enclave->manifest,
.is_binary = false,
.addr = 0,
.size = ALLOC_ALIGN_UP(manifest_size),
.prot = PROT_READ,
.type = SGX_PAGE_REG};
area_num++;
areas[area_num] =
(struct mem_area){.desc = "ssa",
.skip_eextend = false,
.fd = -1,
.is_binary = false,
.addr = 0,
.size = enclave->thread_num * enclave->ssaframesize * SSAFRAMENUM,
.prot = PROT_READ | PROT_WRITE,
.type = SGX_PAGE_REG};
struct mem_area* ssa_area = &areas[area_num++];
areas[area_num] = (struct mem_area){.desc = "tcs",
.skip_eextend = false,
.fd = -1,
.is_binary = false,
.addr = 0,
.size = enclave->thread_num * g_page_size,
.prot = PROT_READ | PROT_WRITE,
.type = SGX_PAGE_TCS};
struct mem_area* tcs_area = &areas[area_num++];
areas[area_num] = (struct mem_area){.desc = "tls",
.skip_eextend = false,
.fd = -1,
.is_binary = false,
.addr = 0,
.size = enclave->thread_num * g_page_size,
.prot = PROT_READ | PROT_WRITE,
.type = SGX_PAGE_REG};
struct mem_area* tls_area = &areas[area_num++];
struct mem_area* stack_areas = &areas[area_num]; /* memorize for later use */
for (uint32_t t = 0; t < enclave->thread_num; t++) {
areas[area_num] = (struct mem_area){.desc = "stack",
.skip_eextend = false,
.fd = -1,
.is_binary = false,
.addr = 0,
.size = ENCLAVE_STACK_SIZE,
.prot = PROT_READ | PROT_WRITE,
.type = SGX_PAGE_REG};
area_num++;
}
struct mem_area* sig_stack_areas = &areas[area_num]; /* memorize for later use */
for (uint32_t t = 0; t < enclave->thread_num; t++) {
areas[area_num] = (struct mem_area){.desc = "sig_stack",
.skip_eextend = false,
.fd = -1,
.is_binary = false,
.addr = 0,
.size = ENCLAVE_SIG_STACK_SIZE,
.prot = PROT_READ | PROT_WRITE,
.type = SGX_PAGE_REG};
area_num++;
}
areas[area_num] = (struct mem_area){.desc = "pal",
.skip_eextend = false,
.fd = enclave_image,
.is_binary = true,
.addr = 0,
.size = 0 /* set below */,
.prot = 0,
.type = SGX_PAGE_REG};
struct mem_area* pal_area = &areas[area_num++];
ret = scan_enclave_binary(enclave_image, &pal_area->addr, &pal_area->size, &enclave_entry_addr);
if (ret < 0) {
SGX_DBG(DBG_E, "Scanning Pal binary (%s) failed: %d\n", enclave->libpal_uri, -ret);
goto out;
}
struct mem_area* exec_area = NULL;
if (enclave->exec != -1) {
areas[area_num] = (struct mem_area){.desc = "exec",
.skip_eextend = false,
.fd = enclave->exec,
.is_binary = true,
.addr = 0,
.size = 0 /* set below */,
.prot = PROT_WRITE,
.type = SGX_PAGE_REG};
exec_area = &areas[area_num++];
ret = scan_enclave_binary(enclave->exec, &exec_area->addr, &exec_area->size, NULL);
if (ret < 0) {
SGX_DBG(DBG_E, "Scanning application binary failed: %d\n", -ret);
goto out;
}
}
unsigned long populating = enclave->size;
for (int i = 0; i < area_num; i++) {
if (areas[i].addr)
continue;
areas[i].addr = populating - areas[i].size;
populating = areas[i].addr;
}
enclave_entry_addr += pal_area->addr;
if (exec_area) {
if (exec_area->addr + exec_area->size > pal_area->addr) {
SGX_DBG(DBG_E, "Application binary overlaps with Pal binary\n");
ret = -EINVAL;
goto out;
}
if (exec_area->addr + exec_area->size < populating) {
if (populating > enclave_heap_min) {
unsigned long addr = exec_area->addr + exec_area->size;
if (addr < enclave_heap_min)
addr = enclave_heap_min;
areas[area_num] = (struct mem_area){.desc = "free",
.skip_eextend = true,
.fd = -1,
.is_binary = false,
.addr = addr,
.size = populating - addr,
.prot = PROT_READ | PROT_WRITE | PROT_EXEC,
.type = SGX_PAGE_REG};
area_num++;
}
populating = exec_area->addr;
}
}
if (populating > enclave_heap_min) {
areas[area_num] = (struct mem_area){.desc = "free",
.skip_eextend = true,
.fd = -1,
.is_binary = false,
.addr = enclave_heap_min,
.size = populating - enclave_heap_min,
.prot = PROT_READ | PROT_WRITE | PROT_EXEC,
.type = SGX_PAGE_REG};
area_num++;
}
for (int i = 0; i < area_num; i++) {
if (areas[i].fd != -1 && areas[i].is_binary) {
ret = load_enclave_binary(&enclave_secs, areas[i].fd, areas[i].addr, areas[i].prot);
if (ret < 0) {
SGX_DBG(DBG_E, "Loading enclave binary failed: %d\n", -ret);
goto out;
}
continue;
}
void* data = NULL;
if (!strcmp(areas[i].desc, "tls")) {
data = (void*)INLINE_SYSCALL(mmap, 6, NULL, areas[i].size, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (IS_ERR_P(data) || data == NULL) {
/* Note that Graphene currently doesn't handle 0x0 addresses */
SGX_DBG(DBG_E, "Allocating memory for tls pages failed\n");
goto out;
}
for (uint32_t t = 0; t < enclave->thread_num; t++) {
struct enclave_tls* gs = data + g_page_size * t;
memset(gs, 0, g_page_size);
assert(sizeof(*gs) <= g_page_size);
gs->common.self = (PAL_TCB*)(tls_area->addr + g_page_size * t + enclave_secs.base);
gs->enclave_size = enclave->size;
gs->tcs_offset = tcs_area->addr + g_page_size * t;
gs->initial_stack_offset = stack_areas[t].addr + ENCLAVE_STACK_SIZE;
gs->sig_stack_low = sig_stack_areas[t].addr + enclave_secs.base;
gs->sig_stack_high =
sig_stack_areas[t].addr + ENCLAVE_SIG_STACK_SIZE + enclave_secs.base;
gs->ssa = (void*)ssa_area->addr + enclave->ssaframesize * SSAFRAMENUM * t +
enclave_secs.base;
gs->gpr = gs->ssa + enclave->ssaframesize - sizeof(sgx_pal_gpr_t);
gs->manifest_size = manifest_size;
gs->heap_min = (void*)enclave_secs.base + enclave_heap_min;
gs->heap_max = (void*)enclave_secs.base + pal_area->addr;
if (exec_area) {
gs->exec_addr = (void*)enclave_secs.base + exec_area->addr;
gs->exec_size = exec_area->size;
}
gs->thread = NULL;
}
} else if (!strcmp(areas[i].desc, "tcs")) {
data = (void*)INLINE_SYSCALL(mmap, 6, NULL, areas[i].size, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (IS_ERR_P(data) || data == NULL) {
/* Note that Graphene currently doesn't handle 0x0 addresses */
SGX_DBG(DBG_E, "Allocating memory for tcs pages failed\n");
goto out;
}
for (uint32_t t = 0; t < enclave->thread_num; t++) {
sgx_arch_tcs_t* tcs = data + g_page_size * t;
memset(tcs, 0, g_page_size);
tcs->ossa = ssa_area->addr + enclave->ssaframesize * SSAFRAMENUM * t;
tcs->nssa = SSAFRAMENUM;
tcs->oentry = enclave_entry_addr;
tcs->ofs_base = 0;
tcs->ogs_base = tls_area->addr + t * g_page_size;
tcs->ofs_limit = 0xfff;
tcs->ogs_limit = 0xfff;
tcs_addrs[t] = (void*)enclave_secs.base + tcs_area->addr + g_page_size * t;
}
} else if (areas[i].fd != -1) {
data = (void*)INLINE_SYSCALL(mmap, 6, NULL, areas[i].size, PROT_READ,
MAP_FILE | MAP_PRIVATE, areas[i].fd, 0);
if (IS_ERR_P(data) || data == NULL) {
/* Note that Graphene currently doesn't handle 0x0 addresses */
SGX_DBG(DBG_E, "Allocating memory for file %s failed\n", areas[i].desc);
goto out;
}
}
ret = add_pages_to_enclave(&enclave_secs, (void*)areas[i].addr, data, areas[i].size,
areas[i].type, areas[i].prot, areas[i].skip_eextend,
areas[i].desc);
if (data)
INLINE_SYSCALL(munmap, 2, data, areas[i].size);
if (ret < 0) {
SGX_DBG(DBG_E, "Adding pages (%s) to enclave failed: %d\n", areas[i].desc, -ret);
goto out;
}
}
ret = init_enclave(&enclave_secs, &enclave_sigstruct, &enclave_token);
if (ret < 0) {
SGX_DBG(DBG_E, "Initializing enclave failed: %d\n", -ret);
goto out;
}
create_tcs_mapper((void*)enclave_secs.base + tcs_area->addr, enclave->thread_num);
struct enclave_dbginfo* dbg = (void*)INLINE_SYSCALL(
mmap, 6, DBGINFO_ADDR, sizeof(struct enclave_dbginfo), PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
if (IS_ERR_P(dbg)) {
SGX_DBG(DBG_E, "Cannot allocate debug information (GDB will not work)\n");
} else {
dbg->pid = INLINE_SYSCALL(getpid, 0);
dbg->base = enclave->baseaddr;
dbg->size = enclave->size;
dbg->ssaframesize = enclave->ssaframesize;
dbg->aep = async_exit_pointer;
dbg->eresume = eresume_pointer;
dbg->thread_tids[0] = dbg->pid;
for (int i = 0; i < MAX_DBG_THREADS; i++)
dbg->tcs_addrs[i] = tcs_addrs[i];
}
if (g_sgx_enable_stats) {
/* set TCS.FLAGS.DBGOPTIN in all enclave threads to enable perf counters, Intel PT, etc */
enclave_mem = INLINE_SYSCALL(open, 3, "/proc/self/mem", O_RDWR | O_LARGEFILE, 0);
if (IS_ERR(enclave_mem)) {
SGX_DBG(DBG_E, "Setting TCS.FLAGS.DBGOPTIN failed: %d\n", -enclave_mem);
goto out;
}
for (size_t i = 0; i < enclave->thread_num; i++) {
uint64_t tcs_flags;
uint64_t* tcs_flags_ptr = tcs_addrs[i] + offsetof(sgx_arch_tcs_t, flags);
ret = INLINE_SYSCALL(pread, 4, enclave_mem, &tcs_flags, sizeof(tcs_flags),
(off_t)tcs_flags_ptr);
if (IS_ERR(ret)) {
SGX_DBG(DBG_E, "Reading TCS.FLAGS.DBGOPTIN failed: %d\n", -ret);
goto out;
}
tcs_flags |= TCS_FLAGS_DBGOPTIN;
ret = INLINE_SYSCALL(pwrite, 4, enclave_mem, &tcs_flags, sizeof(tcs_flags),
(off_t)tcs_flags_ptr);
if (IS_ERR(ret)) {
SGX_DBG(DBG_E, "Writing TCS.FLAGS.DBGOPTIN failed: %d\n", -ret);
goto out;
}
}
}
ret = 0;
out:
if (enclave_image >= 0)
INLINE_SYSCALL(close, 1, enclave_image);
if (enclave_mem >= 0)
INLINE_SYSCALL(close, 1, enclave_mem);
return ret;
}
static void create_instance(struct pal_sec* pal_sec) {
PAL_NUM id = ((uint64_t)rdrand() << 32) | rdrand();
snprintf(pal_sec->pipe_prefix, sizeof(pal_sec->pipe_prefix), "/graphene/%016lx/", id);
pal_sec->instance_id = id;
}
static int load_manifest(int fd, struct config_store** config_ptr) {
int ret = 0;
int nbytes = INLINE_SYSCALL(lseek, 3, fd, 0, SEEK_END);
if (IS_ERR(nbytes)) {
SGX_DBG(DBG_E, "Cannot detect size of manifest file\n");
return -ERRNO(nbytes);
}
struct config_store* config = malloc(sizeof(struct config_store));
if (!config) {
SGX_DBG(DBG_E, "Not enough memory for config_store of manifest\n");
return -ENOMEM;
}
void* config_raw = (void*)INLINE_SYSCALL(mmap, 6, NULL, nbytes, PROT_READ, MAP_PRIVATE, fd, 0);
if (IS_ERR_P(config_raw)) {
SGX_DBG(DBG_E, "Cannot mmap manifest file\n");
ret = -ERRNO_P(config_raw);
goto out;
}
config->raw_data = config_raw;
config->raw_size = nbytes;
config->malloc = malloc;
config->free = NULL;
const char* errstring = NULL;
ret = read_config(config, NULL, &errstring);
if (ret < 0) {
SGX_DBG(DBG_E, "Cannot read manifest: %s\n", errstring);
goto out;
}
*config_ptr = config;
ret = 0;
out:
if (ret < 0) {
free(config);
if (!IS_ERR_P(config_raw))
INLINE_SYSCALL(munmap, 2, config_raw, nbytes);
}
return ret;
}
/*
* Returns the number of resources present in the file and -errno on failure. For example
* /sys/devices/system/cpu/online,.with complex formats like "1,3-5,6 will return 5. While on a
* host without SMT support, /sys/devices/system/cpu/smt/active will return 0, the actual value.
*/
static int get_hw_res_count(const char *filename) {
int fd = INLINE_SYSCALL(open, 3, filename, O_RDONLY | O_CLOEXEC, 0);
if (fd < 0)
return unix_to_pal_error(ERRNO(fd));
char buf[64];
int ret = INLINE_SYSCALL(read, 3, fd, buf, sizeof(buf) - 1);
INLINE_SYSCALL(close, 1, fd);
if (ret < 0) {
return unix_to_pal_error(ERRNO(ret));
}
buf[ret] = '\0'; /* ensure null-terminated buf even in partial read */
bool is_range = PAL_FALSE;
char* end;
char* ptr = buf;
int cpu_count = 0;
while (*ptr) {
while (*ptr == ' ' || *ptr == '\t' || *ptr == ',') {
ptr++;
is_range = PAL_TRUE;
}
int firstint = (int)strtol(ptr, &end, 10);
if (ptr == end)
break;
if (*end == '\n' && !is_range) {
cpu_count = firstint;
} else if (*end == '\0' || *end == ',' || *end == '\n') {
/* single CPU index, count as one more CPU */
cpu_count++;
} else if (*end == '-') {
/* CPU range, count how many CPUs in range */
ptr = end + 1;
int secondint = (int)strtol(ptr, &end, 10);
if (secondint > firstint)
cpu_count += secondint - firstint + 1; // inclusive (e.g., 0-7, or 8-16)
}
ptr = end;
}
return cpu_count;
}
static int load_enclave(struct pal_enclave* enclave, int manifest_fd, char* manifest_uri,
char* exec_uri, char* args, size_t args_size, char* env, size_t env_size,
bool exec_uri_inferred, bool need_gsgx) {
char filename[128];
struct pal_sec* pal_sec = &enclave->pal_sec;
int ret;
#if PRINT_ENCLAVE_STAT == 1
struct timeval tv;
INLINE_SYSCALL(gettimeofday, 2, &tv, NULL);
pal_sec->start_time = tv.tv_sec * 1000000UL + tv.tv_usec;
#endif
ret = open_sgx_driver(need_gsgx);
if (ret < 0)
return ret;
if (!is_wrfsbase_supported())
return -EPERM;
pal_sec->pid = INLINE_SYSCALL(getpid, 0);
pal_sec->uid = INLINE_SYSCALL(getuid, 0);
pal_sec->gid = INLINE_SYSCALL(getgid, 0);
int num_cpus = get_hw_res_count("/sys/devices/system/cpu/online");
if (num_cpus <= 0) {
return num_cpus;
}
pal_sec->num_cpus = num_cpus;
int cpu_cores = get_hw_res_count("/sys/devices/system/cpu/cpu0/topology/core_siblings_list");
if (cpu_cores <= 0) {
return cpu_cores;
}
int smt_active = get_hw_res_count("/sys/devices/system/cpu/smt/active");
if (smt_active < 0)
return smt_active;
/* This code assumes there are only 2 HTs per core but platforms like KNL can have more */
pal_sec->cpu_cores = (smt_active == 0) ? cpu_cores : (cpu_cores / 2);
/* Extract physical id for /proc/cpuinfo */
int phy_id = 0;
for (int idx =0; idx < num_cpus; idx++) {
snprintf(filename, sizeof(filename),
"/sys/devices/system/cpu/cpu%d/topology/physical_package_id", idx);
phy_id = get_hw_res_count(filename);
if (phy_id < 0) {
return phy_id;
}
pal_sec->phy_id[idx] = phy_id;
}
#ifdef DEBUG
size_t env_i = 0;
while (env_i < env_size) {
if (!strcmp(&env[env_i], "IN_GDB=1")) {
SGX_DBG(DBG_I, "[ Running under GDB ]\n");
pal_sec->in_gdb = true;
} else if (strstartswith(&env[env_i], "LD_PRELOAD=")) {
uint64_t env_i_size = strnlen(&env[env_i], env_size - env_i) + 1;
memmove(&env[env_i], &env[env_i + env_i_size], env_size - env_i - env_i_size);
env_size -= env_i_size;
continue;
}
env_i += strnlen(&env[env_i], env_size - env_i) + 1;
}
enclave->debug_map = NULL;
#endif
enclave->manifest = manifest_fd;
ret = load_manifest(enclave->manifest, &enclave->config);
if (ret < 0) {
SGX_DBG(DBG_E, "Invalid manifest: %s\n", manifest_uri);
return -EINVAL;
}
enclave->libpal_uri = alloc_concat(URI_PREFIX_FILE, URI_PREFIX_FILE_LEN, g_libpal_path, -1);
if (!enclave->libpal_uri) {
SGX_DBG(DBG_E, "Out of memory for enclave->libpal_uri\n");
return -ENOMEM;
}
if (enclave->libpal_uri[URI_PREFIX_FILE_LEN] != '/') {
SGX_DBG(DBG_E, "Path to in-enclave PAL (%s) must be absolute\n", enclave->libpal_uri);
return -EINVAL;
}
char cfgbuf[CONFIG_MAX];
const char* errstring = "out of memory";
// A manifest can specify an executable with a different base name
// than the manifest itself. Always give the exec field of the manifest
// precedence if specified.
if (get_config(enclave->config, "loader.exec", cfgbuf, sizeof(cfgbuf)) > 0) {
exec_uri = resolve_uri(cfgbuf, &errstring);
exec_uri_inferred = false;
if (!exec_uri) {
SGX_DBG(DBG_E, "%s: %s\n", errstring, cfgbuf);
return -EINVAL;
}
}
enclave->exec = INLINE_SYSCALL(open, 3, exec_uri + URI_PREFIX_FILE_LEN,
O_RDONLY|O_CLOEXEC, 0);
if (IS_ERR(enclave->exec)) {
if (exec_uri_inferred) {
// It is valid for an enclave not to have an executable.
// We need to catch the case where we inferred the executable
// from the manifest file name, but it doesn't exist, and let
// the enclave go a bit further. Go ahead and warn the user,
// though.
SGX_DBG(DBG_I,
"Inferred executable cannot be opened: %s. This may be ok, "
"or may represent a manifest misconfiguration. This typically "
"represents advanced usage, and if it is not what you intended, "
"try setting the loader.exec field in the manifest.\n",
exec_uri);
enclave->exec = -1;
} else {
SGX_DBG(DBG_E, "Cannot open executable %s\n", exec_uri);
return -EINVAL;
}
}
if (get_config(enclave->config, "sgx.sigfile", cfgbuf, sizeof(cfgbuf)) < 0) {
SGX_DBG(DBG_E, "Sigstruct file not found ('sgx.sigfile' must be specified in manifest)\n");
return -EINVAL;
}
char* sig_uri = resolve_uri(cfgbuf, &errstring);
if (!sig_uri) {
SGX_DBG(DBG_E, "%s: %s\n", errstring, cfgbuf);
return -EINVAL;
}
if (!strendswith(sig_uri, ".sig")) {
SGX_DBG(DBG_E, "Invalid sigstruct file URI as %s\n", cfgbuf);
free(sig_uri);
return -EINVAL;
}
enclave->sigfile = INLINE_SYSCALL(open, 3, sig_uri + URI_PREFIX_FILE_LEN,
O_RDONLY|O_CLOEXEC, 0);
if (IS_ERR(enclave->sigfile)) {
SGX_DBG(DBG_E, "Cannot open sigstruct file %s\n", sig_uri);
free(sig_uri);
return -EINVAL;
}
char* token_uri = alloc_concat(sig_uri, strlen(sig_uri) - static_strlen(".sig"), ".token", -1);
free(sig_uri);
if (!token_uri) {
INLINE_SYSCALL(close, 1, enclave->sigfile);
return -ENOMEM;
}
enclave->token = INLINE_SYSCALL(open, 3, token_uri + URI_PREFIX_FILE_LEN, O_RDONLY | O_CLOEXEC,
0);
if (IS_ERR(enclave->token)) {
SGX_DBG(DBG_E,
"Cannot open token \'%s\'. Use \'"
"Pal/src/host/Linux-SGX/signer/pal-sgx-get-token"
"\' on the runtime host or run \'make SGX=1 sgx-tokens\' in the Graphene source to "
"create the token file.\n",
token_uri);
free(token_uri);
return -EINVAL;
}
SGX_DBG(DBG_I, "Token file: %s\n", token_uri);
free(token_uri);
ret = initialize_enclave(enclave);
if (ret < 0)
return ret;
if (!pal_sec->instance_id)
create_instance(&enclave->pal_sec);
memcpy(pal_sec->manifest_name, manifest_uri, strlen(manifest_uri) + 1);
if (enclave->exec == -1) {
memset(pal_sec->exec_name, 0, sizeof(PAL_SEC_STR));
} else {
memcpy(pal_sec->exec_name, exec_uri, strlen(exec_uri) + 1);
}
ret = sgx_signal_setup();
if (ret < 0)
return ret;
if (get_config(enclave->config, "sgx.remote_attestation", cfgbuf, sizeof(cfgbuf)) < 0 &&
(get_config(enclave->config, "sgx.ra_client_spid", cfgbuf, sizeof(cfgbuf)) > 0 ||
get_config(enclave->config, "sgx.ra_client_linkable", cfgbuf, sizeof(cfgbuf)) > 0)) {
SGX_DBG(DBG_E,
"Detected EPID remote attestation parameters \'ra_client_spid\' and/or "
"\'ra_client_linkable\' in the manifest but no \'remote_attestation\' parameter. "
"Please add \'sgx.remote_attestation = 1\' to the manifest.\n");
return -EINVAL;
}
if (get_config(enclave->config, "sgx.remote_attestation", cfgbuf, sizeof(cfgbuf)) > 0) {
/* initialize communication with Quoting Enclave only if app requests attestation */
ret = init_quoting_enclave_targetinfo(&pal_sec->qe_targetinfo);
if (ret < 0)
return ret;
}
void* alt_stack = (void*)INLINE_SYSCALL(mmap, 6, NULL, ALT_STACK_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (IS_ERR_P(alt_stack))
return -ENOMEM;
/* initialize TCB at the top of the alternative stack */
PAL_TCB_URTS* tcb = alt_stack + ALT_STACK_SIZE - sizeof(PAL_TCB_URTS);
pal_tcb_urts_init(tcb, /*stack=*/NULL,
alt_stack); /* main thread uses the stack provided by Linux */
ret = pal_thread_init(tcb);
if (ret < 0)
return ret;
/* start running trusted PAL */
ecall_enclave_start(enclave->libpal_uri, args, args_size, env, env_size);
unmap_tcs();
INLINE_SYSCALL(munmap, 2, alt_stack, ALT_STACK_SIZE);
INLINE_SYSCALL(exit, 0);
return 0;
}
/* Grow stack of main thread to THREAD_STACK_SIZE by allocating a large dummy array and probing
* each stack page (Linux dynamically grows the stack of the main thread but gets confused with
* huge-jump stack accesses coming from within the enclave). Note that other, non-main threads
* are created manually via clone(.., THREAD_STACK_SIZE, ..) and thus do not need this hack. */
static void __attribute__((noinline)) force_linux_to_grow_stack(void) {
char dummy[THREAD_STACK_SIZE];
for (uint64_t i = 0; i < sizeof(dummy); i += PRESET_PAGESIZE) {
/* touch each page on the stack just to make it is not optimized away */
__asm__ volatile(
"movq %0, %%rbx\r\n"
"movq (%%rbx), %%rbx\r\n"
:
: "r"(&dummy[i])
: "%rbx");
}
}
int main(int argc, char* argv[], char* envp[]) {
char* manifest_uri = NULL;
char* exec_uri = NULL;
int fd = -1;
int ret = 0;
bool exec_uri_inferred = false; // Handle the case where the exec uri is inferred from
// the manifest name somewhat differently
bool need_gsgx = true;
force_linux_to_grow_stack();
if (argc < 4)
goto usage;
g_pal_loader_path = get_main_exec_path();
if (!g_pal_loader_path) {
ret = -ENOMEM;