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/*
* SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
unsigned long, prot, unsigned long, flags,
unsigned long, fd, unsigned long, offset)
*
* sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
*/
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include "maps.h"
#include "sanitise.h"
#include "shm.h"
#include "arch.h"
#include "compat.h"
#include "objects.h"
#include "random.h"
#include "syscall.h"
#include "tables.h"
#include "trinity.h"
#include "utils.h" //ARRAY_SIZE
// need this to actually get MAP_UNINITIALIZED defined
#define CONFIG_MMAP_ALLOW_UNINITIALIZED
static void do_anon(struct syscallrecord *rec)
{
/* no fd if anonymous mapping. */
rec->a5 = -1;
rec->a6 = 0;
}
unsigned long mmap_excl_flags[] = {
MAP_SHARED, MAP_PRIVATE,
};
unsigned long get_rand_mmap_flags(void)
{
unsigned long flags;
const unsigned long mmap_flags[] = {
MAP_FIXED, MAP_ANONYMOUS, MAP_GROWSDOWN, MAP_DENYWRITE,
MAP_EXECUTABLE, MAP_LOCKED, MAP_NORESERVE, MAP_POPULATE,
MAP_NONBLOCK, MAP_STACK, MAP_HUGETLB, MAP_UNINITIALIZED,
#ifdef __x86_64__
MAP_32BIT,
#endif
};
flags = RAND_ARRAY(mmap_excl_flags);
if (RAND_BOOL())
flags |= set_rand_bitmask(ARRAY_SIZE(mmap_flags), mmap_flags);
return flags;
}
static void sanitise_mmap(struct syscallrecord *rec)
{
/* Don't actually set a hint right now. */
rec->a1 = 0;
rec->a2 = RAND_ARRAY(mapping_sizes);
/* this over-rides the ARG_OP in the syscall struct */
rec->a4 = get_rand_mmap_flags();
if (rec->a4 & MAP_ANONYMOUS) {
do_anon(rec);
} else {
rec->a5 = get_random_fd();
if (rec->a5 == (unsigned long) -1)
rec->a5 = 0;
if (this_syscallname("mmap2") == TRUE) {
/* mmap2 counts in 4K units */
rec->a6 /= 4096;
} else {
/* page align non-anonymous mappings. */
rec->a6 &= PAGE_MASK;
}
}
}
static void post_mmap(struct syscallrecord *rec)
{
char *p;
struct object *new;
p = (void *) rec->retval;
if (p == MAP_FAILED)
return;
new = alloc_object();
new->map.name = strdup("misc");
new->map.size = rec->a2;
new->map.prot = rec->a3;
//TODO: store fd if !anon
new->map.ptr = p;
new->map.type = CHILD_ANON;
// Add this to a list for use by subsequent syscalls.
add_object(new, OBJ_LOCAL, OBJ_MMAP_ANON);
/* Sometimes dirty the mapping. */
if (RAND_BOOL())
dirty_mapping(&new->map);
}
static char * decode_mmap(struct syscallrecord *rec, unsigned int argnum)
{
char *buf;
if (argnum == 3) {
int flags = rec->a3;
char *p;
p = buf = zmalloc(80);
p += sprintf(buf, "[");
if (flags == 0) {
p += sprintf(p, "PROT_NONE]");
return buf;
}
if (flags & PROT_READ)
p += sprintf(p, "PROT_READ|");
if (flags & PROT_WRITE)
p += sprintf(p, "PROT_WRITE|");
if (flags & PROT_EXEC)
p += sprintf(p, "PROT_EXEC|");
if (flags & PROT_SEM)
p += sprintf(p, "PROT_SEM ");
p--;
sprintf(p, "]");
return buf;
}
return NULL;
}
static unsigned long mmap_prots[] = {
PROT_READ, PROT_WRITE, PROT_EXEC, PROT_SEM,
};
struct syscallentry syscall_mmap = {
.name = "mmap",
.num_args = 6,
.sanitise = sanitise_mmap,
.post = post_mmap,
.decode = decode_mmap,
.arg1name = "addr",
.arg2name = "len",
.arg2type = ARG_LEN,
.arg3name = "prot",
.arg3type = ARG_LIST,
.arg3list = ARGLIST(mmap_prots),
.arg4name = "flags",
.arg4type = ARG_OP,
.arg4list = ARGLIST(mmap_excl_flags),
.arg5name = "fd",
.arg5type = ARG_FD,
.arg6name = "off",
.arg6type = ARG_LEN,
.group = GROUP_VM,
.flags = NEED_ALARM,
};
struct syscallentry syscall_mmap2 = {
.name = "mmap2",
.num_args = 6,
.sanitise = sanitise_mmap,
.post = post_mmap,
.decode = decode_mmap,
.arg1name = "addr",
.arg2name = "len",
.arg2type = ARG_LEN,
.arg3name = "prot",
.arg3type = ARG_LIST,
.arg3list = ARGLIST(mmap_prots),
.arg4name = "flags",
.arg4type = ARG_OP,
.arg4list = ARGLIST(mmap_excl_flags),
.arg5name = "fd",
.arg5type = ARG_FD,
.arg6name = "pgoff",
.arg6type = ARG_LEN,
.group = GROUP_VM,
.flags = NEED_ALARM,
};
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