提交 d471ce53 编写于 作者: L Linus Torvalds

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml

Pull UML fixes from Richard Weinberger:
 "Special thanks goes to Toralf Föster for continuously testing UML and
  reporting issues!"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml:
  um: remove dead code
  um: siginfo cleanup
  uml: Fix which_tmpdir failure when /dev/shm is a symlink, and in other edge cases
  um: Fix wait_stub_done() error handling
  um: Mark stub pages mapping with VM_PFNMAP
  um: Fix return value of strnlen_user()
......@@ -6,13 +6,13 @@
#ifndef __FRAME_KERN_H_
#define __FRAME_KERN_H_
extern int setup_signal_stack_sc(unsigned long stack_top, int sig,
extern int setup_signal_stack_sc(unsigned long stack_top, int sig,
struct k_sigaction *ka,
struct pt_regs *regs,
struct pt_regs *regs,
sigset_t *mask);
extern int setup_signal_stack_si(unsigned long stack_top, int sig,
extern int setup_signal_stack_si(unsigned long stack_top, int sig,
struct k_sigaction *ka,
struct pt_regs *regs, siginfo_t *info,
struct pt_regs *regs, struct siginfo *info,
sigset_t *mask);
#endif
......
......@@ -19,7 +19,7 @@ EXPORT_SYMBOL(unblock_signals);
* OK, we're invoking a handler
*/
static void handle_signal(struct pt_regs *regs, unsigned long signr,
struct k_sigaction *ka, siginfo_t *info)
struct k_sigaction *ka, struct siginfo *info)
{
sigset_t *oldset = sigmask_to_save();
int singlestep = 0;
......@@ -71,7 +71,7 @@ static void handle_signal(struct pt_regs *regs, unsigned long signr,
static int kern_do_signal(struct pt_regs *regs)
{
struct k_sigaction ka_copy;
siginfo_t info;
struct siginfo info;
int sig, handled_sig = 0;
while ((sig = get_signal_to_deliver(&info, &ka_copy, regs, NULL)) > 0) {
......
......@@ -123,7 +123,7 @@ void uml_setup_stubs(struct mm_struct *mm)
/* dup_mmap already holds mmap_sem */
err = install_special_mapping(mm, STUB_START, STUB_END - STUB_START,
VM_READ | VM_MAYREAD | VM_EXEC |
VM_MAYEXEC | VM_DONTCOPY,
VM_MAYEXEC | VM_DONTCOPY | VM_PFNMAP,
mm->context.stub_pages);
if (err) {
printk(KERN_ERR "install_special_mapping returned %d\n", err);
......
......@@ -254,6 +254,6 @@ int strnlen_user(const void __user *str, int len)
n = buffer_op((unsigned long) str, len, 0, strnlen_chunk, &count);
if (n == 0)
return count + 1;
return -EFAULT;
return 0;
}
EXPORT_SYMBOL(strnlen_user);
......@@ -52,6 +52,25 @@ static void __init find_tempdir(void)
strcat(tempdir, "/");
}
/*
* Remove bytes from the front of the buffer and refill it so that if there's a
* partial string that we care about, it will be completed, and we can recognize
* it.
*/
static int pop(int fd, char *buf, size_t size, size_t npop)
{
ssize_t n;
size_t len = strlen(&buf[npop]);
memmove(buf, &buf[npop], len + 1);
n = read(fd, &buf[len], size - len - 1);
if (n < 0)
return -errno;
buf[len + n] = '\0';
return 1;
}
/*
* This will return 1, with the first character in buf being the
* character following the next instance of c in the file. This will
......@@ -61,7 +80,6 @@ static void __init find_tempdir(void)
static int next(int fd, char *buf, size_t size, char c)
{
ssize_t n;
size_t len;
char *ptr;
while ((ptr = strchr(buf, c)) == NULL) {
......@@ -74,20 +92,129 @@ static int next(int fd, char *buf, size_t size, char c)
buf[n] = '\0';
}
ptr++;
len = strlen(ptr);
memmove(buf, ptr, len + 1);
return pop(fd, buf, size, ptr - buf + 1);
}
/*
* Decode an octal-escaped and space-terminated path of the form used by
* /proc/mounts. May be used to decode a path in-place. "out" must be at least
* as large as the input. The output is always null-terminated. "len" gets the
* length of the output, excluding the trailing null. Returns 0 if a full path
* was successfully decoded, otherwise an error.
*/
static int decode_path(const char *in, char *out, size_t *len)
{
char *first = out;
int c;
int i;
int ret = -EINVAL;
while (1) {
switch (*in) {
case '\0':
goto out;
case ' ':
ret = 0;
goto out;
case '\\':
in++;
c = 0;
for (i = 0; i < 3; i++) {
if (*in < '0' || *in > '7')
goto out;
c = (c << 3) | (*in++ - '0');
}
*(unsigned char *)out++ = (unsigned char) c;
break;
default:
*out++ = *in++;
break;
}
}
out:
*out = '\0';
*len = out - first;
return ret;
}
/*
* Computes the length of s when encoded with three-digit octal escape sequences
* for the characters in chars.
*/
static size_t octal_encoded_length(const char *s, const char *chars)
{
size_t len = strlen(s);
while ((s = strpbrk(s, chars)) != NULL) {
len += 3;
s++;
}
return len;
}
enum {
OUTCOME_NOTHING_MOUNTED,
OUTCOME_TMPFS_MOUNT,
OUTCOME_NON_TMPFS_MOUNT,
};
/* Read a line of /proc/mounts data looking for a tmpfs mount at "path". */
static int read_mount(int fd, char *buf, size_t bufsize, const char *path,
int *outcome)
{
int found;
int match;
char *space;
size_t len;
enum {
MATCH_NONE,
MATCH_EXACT,
MATCH_PARENT,
};
found = next(fd, buf, bufsize, ' ');
if (found != 1)
return found;
/*
* Refill the buffer so that if there's a partial string that we care
* about, it will be completed, and we can recognize it.
* If there's no following space in the buffer, then this path is
* truncated, so it can't be the one we're looking for.
*/
n = read(fd, &buf[len], size - len - 1);
if (n < 0)
return -errno;
space = strchr(buf, ' ');
if (space) {
match = MATCH_NONE;
if (!decode_path(buf, buf, &len)) {
if (!strcmp(buf, path))
match = MATCH_EXACT;
else if (!strncmp(buf, path, len)
&& (path[len] == '/' || !strcmp(buf, "/")))
match = MATCH_PARENT;
}
found = pop(fd, buf, bufsize, space - buf + 1);
if (found != 1)
return found;
switch (match) {
case MATCH_EXACT:
if (!strncmp(buf, "tmpfs", strlen("tmpfs")))
*outcome = OUTCOME_TMPFS_MOUNT;
else
*outcome = OUTCOME_NON_TMPFS_MOUNT;
break;
buf[len + n] = '\0';
return 1;
case MATCH_PARENT:
/* This mount obscures any previous ones. */
*outcome = OUTCOME_NOTHING_MOUNTED;
break;
}
}
return next(fd, buf, bufsize, '\n');
}
/* which_tmpdir is called only during early boot */
......@@ -106,8 +233,12 @@ static int checked_tmpdir = 0;
*/
static void which_tmpdir(void)
{
int fd, found;
char buf[128] = { '\0' };
int fd;
int found;
int outcome;
char *path;
char *buf;
size_t bufsize;
if (checked_tmpdir)
return;
......@@ -116,49 +247,66 @@ static void which_tmpdir(void)
printf("Checking for tmpfs mount on /dev/shm...");
path = realpath("/dev/shm", NULL);
if (!path) {
printf("failed to check real path, errno = %d\n", errno);
return;
}
printf("%s...", path);
/*
* The buffer needs to be able to fit the full octal-escaped path, a
* space, and a trailing null in order to successfully decode it.
*/
bufsize = octal_encoded_length(path, " \t\n\\") + 2;
if (bufsize < 128)
bufsize = 128;
buf = malloc(bufsize);
if (!buf) {
printf("malloc failed, errno = %d\n", errno);
goto out;
}
buf[0] = '\0';
fd = open("/proc/mounts", O_RDONLY);
if (fd < 0) {
printf("failed to open /proc/mounts, errno = %d\n", errno);
return;
goto out1;
}
outcome = OUTCOME_NOTHING_MOUNTED;
while (1) {
found = next(fd, buf, ARRAY_SIZE(buf), ' ');
if (found != 1)
break;
if (!strncmp(buf, "/dev/shm", strlen("/dev/shm")))
goto found;
found = next(fd, buf, ARRAY_SIZE(buf), '\n');
found = read_mount(fd, buf, bufsize, path, &outcome);
if (found != 1)
break;
}
err:
if (found == 0)
printf("nothing mounted on /dev/shm\n");
else if (found < 0)
if (found < 0) {
printf("read returned errno %d\n", -found);
} else {
switch (outcome) {
case OUTCOME_TMPFS_MOUNT:
printf("OK\n");
default_tmpdir = "/dev/shm";
break;
out:
close(fd);
return;
found:
found = next(fd, buf, ARRAY_SIZE(buf), ' ');
if (found != 1)
goto err;
case OUTCOME_NON_TMPFS_MOUNT:
printf("not tmpfs\n");
break;
if (strncmp(buf, "tmpfs", strlen("tmpfs"))) {
printf("not tmpfs\n");
goto out;
default:
printf("nothing mounted on /dev/shm\n");
break;
}
}
printf("OK\n");
default_tmpdir = "/dev/shm";
goto out;
close(fd);
out1:
free(buf);
out:
free(path);
}
static int __init make_tempfile(const char *template, char **out_tempname,
......
......@@ -25,7 +25,7 @@ void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = {
[SIGIO] = sigio_handler,
[SIGVTALRM] = timer_handler };
static void sig_handler_common(int sig, siginfo_t *si, mcontext_t *mc)
static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc)
{
struct uml_pt_regs r;
int save_errno = errno;
......@@ -61,7 +61,7 @@ static void sig_handler_common(int sig, siginfo_t *si, mcontext_t *mc)
static int signals_enabled;
static unsigned int signals_pending;
void sig_handler(int sig, siginfo_t *si, mcontext_t *mc)
void sig_handler(int sig, struct siginfo *si, mcontext_t *mc)
{
int enabled;
......@@ -120,7 +120,7 @@ void set_sigstack(void *sig_stack, int size)
panic("enabling signal stack failed, errno = %d\n", errno);
}
static void (*handlers[_NSIG])(int sig, siginfo_t *si, mcontext_t *mc) = {
static void (*handlers[_NSIG])(int sig, struct siginfo *si, mcontext_t *mc) = {
[SIGSEGV] = sig_handler,
[SIGBUS] = sig_handler,
[SIGILL] = sig_handler,
......@@ -162,7 +162,7 @@ static void hard_handler(int sig, siginfo_t *si, void *p)
while ((sig = ffs(pending)) != 0){
sig--;
pending &= ~(1 << sig);
(*handlers[sig])(sig, si, mc);
(*handlers[sig])(sig, (struct siginfo *)si, mc);
}
/*
......
......@@ -54,7 +54,7 @@ static int ptrace_dump_regs(int pid)
void wait_stub_done(int pid)
{
int n, status, err;
int n, status, err, bad_stop = 0;
while (1) {
CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED | __WALL));
......@@ -74,6 +74,8 @@ void wait_stub_done(int pid)
if (((1 << WSTOPSIG(status)) & STUB_DONE_MASK) != 0)
return;
else
bad_stop = 1;
bad_wait:
err = ptrace_dump_regs(pid);
......@@ -83,7 +85,10 @@ void wait_stub_done(int pid)
printk(UM_KERN_ERR "wait_stub_done : failed to wait for SIGTRAP, "
"pid = %d, n = %d, errno = %d, status = 0x%x\n", pid, n, errno,
status);
fatal_sigsegv();
if (bad_stop)
kill(pid, SIGKILL);
else
fatal_sigsegv();
}
extern unsigned long current_stub_stack(void);
......@@ -409,7 +414,7 @@ void userspace(struct uml_pt_regs *regs)
if (WIFSTOPPED(status)) {
int sig = WSTOPSIG(status);
ptrace(PTRACE_GETSIGINFO, pid, 0, &si);
ptrace(PTRACE_GETSIGINFO, pid, 0, (struct siginfo *)&si);
switch (sig) {
case SIGSEGV:
......@@ -417,7 +422,7 @@ void userspace(struct uml_pt_regs *regs)
!ptrace_faultinfo) {
get_skas_faultinfo(pid,
&regs->faultinfo);
(*sig_info[SIGSEGV])(SIGSEGV, &si,
(*sig_info[SIGSEGV])(SIGSEGV, (struct siginfo *)&si,
regs);
}
else handle_segv(pid, regs);
......@@ -426,14 +431,14 @@ void userspace(struct uml_pt_regs *regs)
handle_trap(pid, regs, local_using_sysemu);
break;
case SIGTRAP:
relay_signal(SIGTRAP, &si, regs);
relay_signal(SIGTRAP, (struct siginfo *)&si, regs);
break;
case SIGVTALRM:
now = os_nsecs();
if (now < nsecs)
break;
block_signals();
(*sig_info[sig])(sig, &si, regs);
(*sig_info[sig])(sig, (struct siginfo *)&si, regs);
unblock_signals();
nsecs = timer.it_value.tv_sec *
UM_NSEC_PER_SEC +
......@@ -447,7 +452,7 @@ void userspace(struct uml_pt_regs *regs)
case SIGFPE:
case SIGWINCH:
block_signals();
(*sig_info[sig])(sig, &si, regs);
(*sig_info[sig])(sig, (struct siginfo *)&si, regs);
unblock_signals();
break;
default:
......
......@@ -508,7 +508,6 @@ int setup_signal_stack_si(unsigned long stack_top, int sig,
{
struct rt_sigframe __user *frame;
int err = 0;
struct task_struct *me = current;
frame = (struct rt_sigframe __user *)
round_down(stack_top - sizeof(struct rt_sigframe), 16);
......
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