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devobj: allow read only device file mappings (OFED 3.3 support)

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This commit is contained in:
Balazs Gerofi
2016-06-21 06:57:47 +09:00
parent d90900b6e6
commit a83ad620c8
4 changed files with 11 additions and 6 deletions
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8
executer/kernel/mcctrl/syscall.c
View File

@ -1208,7 +1208,8 @@ struct pager_map_result {
int8_t padding[4];
};
static int pager_req_map(ihk_os_t os, int fd, size_t len, off_t off, uintptr_t result_rpa)
static int pager_req_map(ihk_os_t os, int fd, size_t len, off_t off,
uintptr_t result_rpa, int prot)
{
const ihk_device_t dev = ihk_os_to_dev(os);
const off_t pgoff = off / PAGE_SIZE;
@ -1239,7 +1240,7 @@ static int pager_req_map(ihk_os_t os, int fd, size_t len, off_t off, uintptr_t r
if (file->f_mode & FMODE_READ) {
maxprot |= PROT_READ;
}
if (file->f_mode & FMODE_WRITE) {
if ((file->f_mode & FMODE_WRITE) && (prot ? (prot & PROT_WRITE) : 1)) {
maxprot |= PROT_WRITE;
}
if (!(file->f_path.mnt->mnt_flags & MNT_NOEXEC)) {
@ -1414,7 +1415,8 @@ static long pager_call(ihk_os_t os, struct syscall_request *req)
break;
case PAGER_REQ_MAP:
ret = pager_req_map(os, req->args[1], req->args[2], req->args[3], req->args[4]);
ret = pager_req_map(os, req->args[1], req->args[2], req->args[3], req->args[4],
req->args[5]);
break;
case PAGER_REQ_PFN:

4
kernel/devobj.c
View File

@ -78,7 +78,8 @@ static struct memobj *to_memobj(struct devobj *devobj)
/***********************************************************************
* devobj
*/
int devobj_create(int fd, size_t len, off_t off, struct memobj **objp, int *maxprotp)
int devobj_create(int fd, size_t len, off_t off, struct memobj **objp, int *maxprotp,
int prot)
{
ihk_mc_user_context_t ctx;
struct pager_map_result result; // XXX: assumes contiguous physical
@ -115,6 +116,7 @@ int devobj_create(int fd, size_t len, off_t off, struct memobj **objp, int *maxp
ihk_mc_syscall_arg2(&ctx) = len;
ihk_mc_syscall_arg3(&ctx) = off;
ihk_mc_syscall_arg4(&ctx) = virt_to_phys(&result);
ihk_mc_syscall_arg5(&ctx) = prot;
error = syscall_generic_forwarding(__NR_mmap, &ctx);
if (error) {

3
kernel/include/memobj.h
View File

@ -141,6 +141,7 @@ int fileobj_create(int fd, struct memobj **objp, int *maxprotp);
struct shmid_ds;
int shmobj_create(struct shmid_ds *ds, struct memobj **objp);
int zeroobj_create(struct memobj **objp);
int devobj_create(int fd, size_t len, off_t off, struct memobj **objp, int *maxprotp);
int devobj_create(int fd, size_t len, off_t off, struct memobj **objp, int *maxprotp,
int prot);
#endif /* HEADER_MEMOBJ_H */

2
kernel/syscall.c
View File

@ -1108,7 +1108,7 @@ do_mmap(const intptr_t addr0, const size_t len0, const int prot,
vrflags &= ~VR_MEMTYPE_MASK;
vrflags |= VR_MEMTYPE_UC;
}
error = devobj_create(fd, len, off, &memobj, &maxprot);
error = devobj_create(fd, len, off, &memobj, &maxprot, prot);
}
if (error) {
ekprintf("do_mmap:fileobj_create failed. %d\n", error);