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#include "api/syscall.h"
#include "hal/memory.h"
#include "jove.h"
#include "lib/printf.h"
#include "syscall.h"
static int
s_get_untyped(
lockstack_t *lockstack,
jove_owned_obj_t *objdir,
jove_owned_obj_t *pml4,
size_t payload_bytes,
void *payload_data,
jove_perm_obj_t *untyped_ret)
{
size_t bytes_needed = sizeof(struct syscall_pagedir_map);
CHECK_TOOSMALL(bytes_needed, payload_bytes,
"Message too small for payload.");
struct syscall_pagedir_map *payload = payload_data;
if(payload->virtual_address > 0xFFFF800000000000ULL) {
kprintf("%s: Virtual address is above user limit.\n", __func__);
return EBADARG;
}
bytes_needed += payload->untyped_pathlen << 1;
CHECK_TOOSMALL(bytes_needed, payload_bytes,
"Message too small for untyped path.");
errno = 0;
jove_perm_obj_t untyped = link_try_traverse(
lockstack_push(lockstack, objdir_trygetobj(
objdir, payload->untyped_path, payload->untyped_pathlen)),
lockstack);
if(errno) {
kprintf("%s: Untyped obj failed for the reason: %s\n", __func__, errstr(errno));
return errno;
}
CHECK_OBJTYPE(untyped.obj, JOVE_OBJ_UNTYPED,
"Untyped path does not point to an untyped object.");
CHECK_OBJPERM(untyped, JOVE_PERM_MUTATE,
"Untyped object does not have MUTATE permission.");
jove_untyped_t *untyped_data = obj_deref(untyped.obj);
if((uintptr_t)untyped_data & 0xFFF) {
kprintf("%s: Untyped object is not page aligned.\n", __func__);
return EALIGN;
}
if(untyped_data->limit != 0x1000) {
kprintf("%s: Untyped object is not page sized. (expected 0x1000 got 0x%X)\n", __func__,
untyped_data->limit);
return EBADSIZE;
}
*untyped_ret = untyped;
return 0;
}
static int
s_syscall_pagedir_unmap(
lockstack_t *lockstack,
jove_owned_obj_t *objdir,
jove_owned_obj_t *pagedir,
size_t payload_bytes,
void *payload_data,
jove_perm_obj_t *none_ret)
{
size_t bytes_needed = sizeof(struct syscall_pagedir_unmap);
CHECK_TOOSMALL(bytes_needed, payload_bytes,
"Message too small for payload");
struct syscall_pagedir_unmap *payload = payload_data;
if(payload->virtual_address > 0xFFFF800000000000ULL) {
kprintf("%s: Virtual address is above user limit.\n", __func__);
return EBADARG;
}
bytes_needed += payload->none_pathlen * 2;
CHECK_TOOSMALL(bytes_needed, payload_bytes,
"Message too small for none path");
jove_perm_obj_t none = link_try_traverse(
lockstack_push(lockstack, objdir_trygetobj(
objdir, payload->none_path, payload->none_pathlen)),
lockstack);
if(errno) {
kprintf("%s: None obj retrieval failed for the reason: %s\n",
__func__, errstr(errno));
return errno;
}
CHECK_OBJTYPE(none.obj, JOVE_OBJ_NONE,
"None path does not point to none object.");
*none_ret = none;
return 0;
}
static int
s_syscall_pagedir_map_frame(
lockstack_t *lockstack,
jove_owned_obj_t *objdir,
jove_owned_obj_t *pagedir,
size_t payload_bytes,
void *payload_data)
{
jove_perm_obj_t untyped = { .obj = NULL, .permissions = 0 };
int sysret = s_get_untyped(lockstack, objdir, pagedir, payload_bytes, payload_data, &untyped);
if(sysret != 0) {
return sysret;
}
struct syscall_pagedir_map *payload = payload_data;
sysret = pagedir_map_untyped_frame(pagedir, &untyped, payload->virtual_address, payload->page_flags);
if(sysret == 0)
obj_settype(untyped.obj, JOVE_OBJ_NONE);
return sysret;
}
static int
s_syscall_pagedir_map_table(
lockstack_t *lockstack,
jove_owned_obj_t *objdir,
jove_owned_obj_t *pagedir,
size_t payload_bytes,
void *payload_data)
{
jove_perm_obj_t untyped = { .obj = NULL, .permissions = 0 };
int sysret = s_get_untyped(lockstack, objdir, pagedir, payload_bytes, payload_data, &untyped);
if(sysret != 0) {
return sysret;
}
struct syscall_pagedir_map *payload = payload_data;
sysret = pagedir_map_untyped_table(pagedir, &untyped, payload->virtual_address);
if(sysret == 0)
obj_settype(untyped.obj, JOVE_OBJ_NONE);
return sysret;
}
static int
s_syscall_pagedir_map_shmem(
lockstack_t *lockstack,
jove_owned_obj_t *objdir,
jove_owned_obj_t *pagedir,
size_t payload_bytes,
void *payload_data)
{
size_t bytes_needed = sizeof(struct syscall_pagedir_map_shmem);
CHECK_TOOSMALL(bytes_needed, payload_bytes,
"Message too small for payload.");
struct syscall_pagedir_map_shmem *payload = payload_data;
if(payload->virtual_address > 0xFFFF800000000000ULL) {
kprintf("%s: Virtual address is above user limit.\n", __func__);
return EBADARG;
}
bytes_needed += payload->shmem_pathlen << 1;
CHECK_TOOSMALL(bytes_needed, payload_bytes,
"Message too small for untyped path.");
errno = 0;
jove_perm_obj_t shmem = link_try_traverse(
lockstack_push(lockstack, objdir_trygetobj(
objdir, payload->shmem_path, payload->shmem_pathlen)),
lockstack);
if(errno) {
klogf("Shared memory obj failed for the reason: %s\n", errstr(errno));
return errno;
}
CHECK_OBJTYPE(shmem.obj, JOVE_OBJ_SHMEMORY,
"Shared memory path does not point to a shared memory object.");
uintmax_t shmem_value = obj_getvalue(shmem.obj);
uint8_t shmem_pages = shmem_value & 0xFF;
if(payload->page_offset >= shmem_pages) {
klogf("Page offset goes beyond size of shared memory object: (%i >= %i)\n",
payload->page_offset, shmem_pages);
return -EOOB;
}
return pagedir_map_shmem_frame(pagedir, &shmem, payload->page_offset,
payload->virtual_address, payload->page_flags);
}
static int
s_syscall_pagedir_unmap_frame(
lockstack_t *lockstack,
jove_owned_obj_t *objdir,
jove_owned_obj_t *pagedir,
size_t payload_bytes,
void *payload_data)
{
jove_perm_obj_t none;
int sysret = s_syscall_pagedir_unmap(lockstack, objdir, pagedir, payload_bytes, payload_data, &none);
if(!sysret) return sysret;
struct syscall_pagedir_unmap *payload = payload_data;
return pagedir_unmap_untyped_frame(pagedir, none.obj, payload->virtual_address);
}
static int
s_syscall_pagedir_unmap_table(
lockstack_t *lockstack,
jove_owned_obj_t *objdir,
jove_owned_obj_t *pagedir,
size_t payload_bytes,
void *payload_data)
{
jove_perm_obj_t none;
int sysret = s_syscall_pagedir_unmap(lockstack, objdir, pagedir, payload_bytes, payload_data, &none);
if(!sysret) return sysret;
struct syscall_pagedir_unmap *payload = payload_data;
return pagedir_unmap_untyped_table(pagedir, none.obj, payload->virtual_address);
}
int
_syscall_handle_pagedir(syscall_context_t *ctx)
{
lockstack_t *lockstack = &ctx->lockstack;
struct syscall_header *header = ctx->header;
jove_owned_obj_t *objdir = ctx->objdir;
jove_perm_obj_t *target = &ctx->target;
size_t bytes_left = ctx->bytes_left;
void *payload = ctx->payload;
switch(header->callid) {
case SYSCALL_PAGEDIR_MAP_FRAME:
if(target->permissions & SYSCALL_PERM_PAGEDIR_MAP_FRAME)
return s_syscall_pagedir_map_frame(lockstack, objdir, target->obj, bytes_left, payload);
return -EPERM;
case SYSCALL_PAGEDIR_MAP_TABLE:
if(target->permissions & SYSCALL_PERM_PAGEDIR_MAP_TABLE)
return s_syscall_pagedir_map_table(lockstack, objdir, target->obj, bytes_left, payload);
return -EPERM;
case SYSCALL_PAGEDIR_MAP_SHMEM:
if(target->permissions & SYSCALL_PERM_PAGEDIR_MAP_SHMEM)
return s_syscall_pagedir_map_shmem(lockstack, objdir, target->obj, bytes_left, payload);
return -EPERM;
case SYSCALL_PAGEDIR_UNMAP_FRAME:
if(target->permissions & SYSCALL_PERM_PAGEDIR_UNMAP_FRAME)
return s_syscall_pagedir_unmap_frame(lockstack, objdir, target->obj, bytes_left, payload);
return -EPERM;
case SYSCALL_PAGEDIR_UNMAP_TABLE:
if(target->permissions & SYSCALL_PERM_PAGEDIR_UNMAP_TABLE)
return s_syscall_pagedir_unmap_table(lockstack, objdir, target->obj, bytes_left, payload);
return -EPERM;
default:
kprintf("syscall_handle_pagedir: Pagedir does not support syscall %i\n", header->callid);
return EBADARG;
}
}
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