this repo has no description
Place the /dev/mach descriptor to the highest fd number and obscure it
+33
-2
+5
src/kernel/emulation/linux/misc/getrlimit.c
+5
src/kernel/emulation/linux/misc/getrlimit.c
+8
-1
src/kernel/emulation/linux/misc/setrlimit.c
+8
-1
src/kernel/emulation/linux/misc/setrlimit.c
···
7
7
long sys_setrlimit(unsigned int which, const struct rlimit* rlp)
8
8
{
9
9
int ret;
10
+
struct rlimit lim = { rlp->rlim_cur, rlp->rlim_max };
10
11
11
12
which = rlimit_bsd_to_linux(which);
12
13
if (which == -1)
13
14
return -EINVAL;
14
15
15
-
ret = LINUX_SYSCALL(__NR_prlimit64, 0, which, rlp, 0);
16
+
if (which == LINUX_RLIMIT_NOFILE)
17
+
{
18
+
lim.rlim_cur++;
19
+
lim.rlim_max++;
20
+
}
21
+
22
+
ret = LINUX_SYSCALL(__NR_prlimit64, 0, which, &lim, 0);
16
23
if (ret < 0)
17
24
ret = errno_linux_to_bsd(ret);
18
25
+1
-1
src/kernel/emulation/linux/unistd/getdtablesize.c
+1
-1
src/kernel/emulation/linux/unistd/getdtablesize.c
+19
src/kernel/mach_server/client/lkm.c
+19
src/kernel/mach_server/client/lkm.c
···
2
2
#include "../../lkm/api.h"
3
3
#include <fcntl.h>
4
4
#include <unistd.h>
5
+
#include <sys/resource.h>
5
6
#include "../../libsyscall/wrappers/_libkernel_init.h"
6
7
7
8
int driver_fd = -1;
···
11
12
extern int sys_close(int);
12
13
extern int sys_write(int, const void*, int);
13
14
extern int sys_kill(int, int);
15
+
extern int sys_getrlimit(int, struct rlimit*);
16
+
extern int sys_dup2(int, int);
17
+
extern int sys_fcntl(int, int, int);
14
18
extern _libkernel_functions_t _libkernel_functions;
15
19
16
20
void mach_driver_init(void)
17
21
{
22
+
struct rlimit lim;
23
+
18
24
if (driver_fd != -1)
19
25
sys_close(driver_fd);
20
26
#ifndef VARIANT_DYLD
···
46
52
47
53
sys_write(2, msg, strlen(msg));
48
54
sys_kill(0, 6);
55
+
}
56
+
57
+
if (sys_getrlimit(RLIMIT_NOFILE, &lim) == 0)
58
+
{
59
+
// sys_getrlimit intentionally reports a limit lower by 1
60
+
// so that our fd remains "hidden" to applications.
61
+
// It also means rlim_cur is not above the limit
62
+
// in the following statement.
63
+
int d = sys_dup2(driver_fd, lim.rlim_cur);
64
+
sys_close(driver_fd);
65
+
66
+
driver_fd = d;
67
+
sys_fcntl(driver_fd, F_SETFD, O_CLOEXEC);
49
68
}
50
69
}
51
70