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-rw-r--r--arch/um/os-Linux/Makefile8
-rw-r--r--arch/um/os-Linux/mem.c161
-rw-r--r--arch/um/os-Linux/start_up.c109
-rw-r--r--arch/um/os-Linux/tt.c14
4 files changed, 286 insertions, 6 deletions
diff --git a/arch/um/os-Linux/Makefile b/arch/um/os-Linux/Makefile
index 7a1662419c0c..d15ec2af6a22 100644
--- a/arch/um/os-Linux/Makefile
+++ b/arch/um/os-Linux/Makefile
@@ -3,11 +3,11 @@
3# Licensed under the GPL 3# Licensed under the GPL
4# 4#
5 5
6obj-y = aio.o elf_aux.o file.o process.o signal.o start_up.o time.o tt.o \ 6obj-y = aio.o elf_aux.o file.o mem.o process.o signal.o start_up.o time.o \
7 tty.o user_syms.o drivers/ sys-$(SUBARCH)/ 7 tt.o tty.o user_syms.o drivers/ sys-$(SUBARCH)/
8 8
9USER_OBJS := aio.o elf_aux.o file.o process.o signal.o start_up.o time.o tt.o \ 9USER_OBJS := aio.o elf_aux.o file.o mem.o process.o signal.o start_up.o \
10 tty.o 10 time.o tt.o tty.o
11 11
12elf_aux.o: $(ARCH_DIR)/kernel-offsets.h 12elf_aux.o: $(ARCH_DIR)/kernel-offsets.h
13CFLAGS_elf_aux.o += -I$(objtree)/arch/um 13CFLAGS_elf_aux.o += -I$(objtree)/arch/um
diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c
new file mode 100644
index 000000000000..8e71edaaf80b
--- /dev/null
+++ b/arch/um/os-Linux/mem.c
@@ -0,0 +1,161 @@
1#include <stdio.h>
2#include <stdlib.h>
3#include <stddef.h>
4#include <stdarg.h>
5#include <unistd.h>
6#include <errno.h>
7#include <string.h>
8#include <fcntl.h>
9#include <sys/types.h>
10#include <sys/mman.h>
11#include "kern_util.h"
12#include "user.h"
13#include "user_util.h"
14#include "mem_user.h"
15#include "init.h"
16#include "os.h"
17#include "tempfile.h"
18#include "kern_constants.h"
19
20#include <sys/param.h>
21
22static char *tempdir = NULL;
23
24static void __init find_tempdir(void)
25{
26 char *dirs[] = { "TMP", "TEMP", "TMPDIR", NULL };
27 int i;
28 char *dir = NULL;
29
30 if(tempdir != NULL) return; /* We've already been called */
31 for(i = 0; dirs[i]; i++){
32 dir = getenv(dirs[i]);
33 if((dir != NULL) && (*dir != '\0'))
34 break;
35 }
36 if((dir == NULL) || (*dir == '\0'))
37 dir = "/tmp";
38
39 tempdir = malloc(strlen(dir) + 2);
40 if(tempdir == NULL){
41 fprintf(stderr, "Failed to malloc tempdir, "
42 "errno = %d\n", errno);
43 return;
44 }
45 strcpy(tempdir, dir);
46 strcat(tempdir, "/");
47}
48
49/*
50 * This proc still used in tt-mode
51 * (file: kernel/tt/ptproxy/proxy.c, proc: start_debugger).
52 * So it isn't 'static' yet.
53 */
54int make_tempfile(const char *template, char **out_tempname, int do_unlink)
55{
56 char tempname[MAXPATHLEN];
57 int fd;
58
59 find_tempdir();
60 if (*template != '/')
61 strcpy(tempname, tempdir);
62 else
63 *tempname = 0;
64 strcat(tempname, template);
65 fd = mkstemp(tempname);
66 if(fd < 0){
67 fprintf(stderr, "open - cannot create %s: %s\n", tempname,
68 strerror(errno));
69 return -1;
70 }
71 if(do_unlink && (unlink(tempname) < 0)){
72 perror("unlink");
73 return -1;
74 }
75 if(out_tempname){
76 *out_tempname = strdup(tempname);
77 if(*out_tempname == NULL){
78 perror("strdup");
79 return -1;
80 }
81 }
82 return(fd);
83}
84
85#define TEMPNAME_TEMPLATE "vm_file-XXXXXX"
86
87/*
88 * This proc is used in start_up.c
89 * So it isn't 'static'.
90 */
91int create_tmp_file(unsigned long len)
92{
93 int fd, err;
94 char zero;
95
96 fd = make_tempfile(TEMPNAME_TEMPLATE, NULL, 1);
97 if(fd < 0) {
98 exit(1);
99 }
100
101 err = fchmod(fd, 0777);
102 if(err < 0){
103 perror("os_mode_fd");
104 exit(1);
105 }
106
107 if (lseek64(fd, len, SEEK_SET) < 0) {
108 perror("os_seek_file");
109 exit(1);
110 }
111
112 zero = 0;
113
114 err = os_write_file(fd, &zero, 1);
115 if(err != 1){
116 errno = -err;
117 perror("os_write_file");
118 exit(1);
119 }
120
121 return(fd);
122}
123
124static int create_anon_file(unsigned long len)
125{
126 void *addr;
127 int fd;
128
129 fd = open("/dev/anon", O_RDWR);
130 if(fd < 0) {
131 perror("opening /dev/anon");
132 exit(1);
133 }
134
135 addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
136 if(addr == MAP_FAILED){
137 perror("mapping physmem file");
138 exit(1);
139 }
140 munmap(addr, len);
141
142 return(fd);
143}
144
145extern int have_devanon;
146
147int create_mem_file(unsigned long len)
148{
149 int err, fd;
150
151 if(have_devanon)
152 fd = create_anon_file(len);
153 else fd = create_tmp_file(len);
154
155 err = os_set_exec_close(fd, 1);
156 if(err < 0){
157 errno = -err;
158 perror("exec_close");
159 }
160 return(fd);
161}
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 040cc1472bc7..6af83171ca4e 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -4,18 +4,22 @@
4 */ 4 */
5 5
6#include <stdio.h> 6#include <stdio.h>
7#include <stddef.h>
8#include <stdarg.h>
9#include <stdlib.h>
10#include <string.h>
7#include <unistd.h> 11#include <unistd.h>
8#include <signal.h> 12#include <signal.h>
9#include <sched.h> 13#include <sched.h>
14#include <fcntl.h>
10#include <errno.h> 15#include <errno.h>
11#include <stdarg.h>
12#include <stdlib.h>
13#include <setjmp.h> 16#include <setjmp.h>
14#include <sys/time.h> 17#include <sys/time.h>
15#include <sys/wait.h> 18#include <sys/wait.h>
16#include <sys/mman.h> 19#include <sys/mman.h>
17#include <asm/unistd.h> 20#include <asm/unistd.h>
18#include <asm/page.h> 21#include <asm/page.h>
22#include <sys/types.h>
19#include "user_util.h" 23#include "user_util.h"
20#include "kern_util.h" 24#include "kern_util.h"
21#include "user.h" 25#include "user.h"
@@ -25,6 +29,7 @@
25#include "sysdep/sigcontext.h" 29#include "sysdep/sigcontext.h"
26#include "irq_user.h" 30#include "irq_user.h"
27#include "ptrace_user.h" 31#include "ptrace_user.h"
32#include "mem_user.h"
28#include "time_user.h" 33#include "time_user.h"
29#include "init.h" 34#include "init.h"
30#include "os.h" 35#include "os.h"
@@ -32,6 +37,8 @@
32#include "choose-mode.h" 37#include "choose-mode.h"
33#include "mode.h" 38#include "mode.h"
34#include "tempfile.h" 39#include "tempfile.h"
40#include "kern_constants.h"
41
35#ifdef UML_CONFIG_MODE_SKAS 42#ifdef UML_CONFIG_MODE_SKAS
36#include "skas.h" 43#include "skas.h"
37#include "skas_ptrace.h" 44#include "skas_ptrace.h"
@@ -276,9 +283,38 @@ static void __init check_ptrace(void)
276 check_sysemu(); 283 check_sysemu();
277} 284}
278 285
286extern int create_tmp_file(unsigned long len);
287
288static void check_tmpexec(void)
289{
290 void *addr;
291 int err, fd = create_tmp_file(UM_KERN_PAGE_SIZE);
292
293 addr = mmap(NULL, UM_KERN_PAGE_SIZE,
294 PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0);
295 printf("Checking PROT_EXEC mmap in /tmp...");
296 fflush(stdout);
297 if(addr == MAP_FAILED){
298 err = errno;
299 perror("failed");
300 if(err == EPERM)
301 printf("/tmp must be not mounted noexec\n");
302 exit(1);
303 }
304 printf("OK\n");
305 munmap(addr, UM_KERN_PAGE_SIZE);
306
307 close(fd);
308}
309
279void os_early_checks(void) 310void os_early_checks(void)
280{ 311{
281 check_ptrace(); 312 check_ptrace();
313
314 /* Need to check this early because mmapping happens before the
315 * kernel is running.
316 */
317 check_tmpexec();
282} 318}
283 319
284static int __init noprocmm_cmd_param(char *str, int* add) 320static int __init noprocmm_cmd_param(char *str, int* add)
@@ -357,3 +393,72 @@ int can_do_skas(void)
357 return(0); 393 return(0);
358} 394}
359#endif 395#endif
396
397int have_devanon = 0;
398
399void check_devanon(void)
400{
401 int fd;
402
403 printk("Checking for /dev/anon on the host...");
404 fd = open("/dev/anon", O_RDWR);
405 if(fd < 0){
406 printk("Not available (open failed with errno %d)\n", errno);
407 return;
408 }
409
410 printk("OK\n");
411 have_devanon = 1;
412}
413
414int __init parse_iomem(char *str, int *add)
415{
416 struct iomem_region *new;
417 struct uml_stat buf;
418 char *file, *driver;
419 int fd, err, size;
420
421 driver = str;
422 file = strchr(str,',');
423 if(file == NULL){
424 printf("parse_iomem : failed to parse iomem\n");
425 goto out;
426 }
427 *file = '\0';
428 file++;
429 fd = os_open_file(file, of_rdwr(OPENFLAGS()), 0);
430 if(fd < 0){
431 os_print_error(fd, "parse_iomem - Couldn't open io file");
432 goto out;
433 }
434
435 err = os_stat_fd(fd, &buf);
436 if(err < 0){
437 os_print_error(err, "parse_iomem - cannot stat_fd file");
438 goto out_close;
439 }
440
441 new = malloc(sizeof(*new));
442 if(new == NULL){
443 perror("Couldn't allocate iomem_region struct");
444 goto out_close;
445 }
446
447 size = (buf.ust_size + UM_KERN_PAGE_SIZE) & ~(UM_KERN_PAGE_SIZE - 1);
448
449 *new = ((struct iomem_region) { .next = iomem_regions,
450 .driver = driver,
451 .fd = fd,
452 .size = size,
453 .phys = 0,
454 .virt = 0 });
455 iomem_regions = new;
456 iomem_size += new->size + UM_KERN_PAGE_SIZE;
457
458 return(0);
459 out_close:
460 os_close_file(fd);
461 out:
462 return(1);
463}
464
diff --git a/arch/um/os-Linux/tt.c b/arch/um/os-Linux/tt.c
index 5b047ab8416a..a6db8877931a 100644
--- a/arch/um/os-Linux/tt.c
+++ b/arch/um/os-Linux/tt.c
@@ -36,6 +36,20 @@
36#include "mode.h" 36#include "mode.h"
37#include "tempfile.h" 37#include "tempfile.h"
38 38
39int protect_memory(unsigned long addr, unsigned long len, int r, int w, int x,
40 int must_succeed)
41{
42 int err;
43
44 err = os_protect_memory((void *) addr, len, r, w, x);
45 if(err < 0){
46 if(must_succeed)
47 panic("protect failed, err = %d", -err);
48 else return(err);
49 }
50 return(0);
51}
52
39/* 53/*
40 *------------------------- 54 *-------------------------
41 * only for tt mode (will be deleted in future...) 55 * only for tt mode (will be deleted in future...)