Merge remote-tracking branch 'remotes/riku/tags/pull-linux-user-20170531' into staging

Misc linux-user updates

# gpg: Signature made Wed 31 May 2017 12:33:17 BST
# gpg:                using RSA key 0xB44890DEDE3C9BC0
# gpg: Good signature from "Riku Voipio <riku.voipio@iki.fi>"
# gpg:                 aka "Riku Voipio <riku.voipio@linaro.org>"
# Primary key fingerprint: FF82 03C8 C391 98AE 0581  41EF B448 90DE DE3C 9BC0

* remotes/riku/tags/pull-linux-user-20170531:
  linux-user: add strace support for uinfo structure of rt_sigqueueinfo() and rt_tgsigqueueinfo()
  linux-user: fix inconsistent spaces in print_siginfo() output
  linux-user: add rt_tgsigqueueinfo() strace
  linux-user: add support for rt_tgsigqueueinfo() system call
  linux-user: fix argument type declaration of rt_sigqueinfo() syscall
  linux-user: fix mismatch of lock/unlock_user() invocations in rt_sigqueinfo() syscall
  linux-user: fix ssetmask() system call
  linux-user: add tkill(), tgkill() and rt_sigqueueinfo() strace
  linux-user: add strace for getuid(), gettid(), getppid(), geteuid()
  linux-user: remove all traces of qemu from /proc/self/cmdline
  linux-user: allocate heap memory for execve arguments
  linux-user: fix inotify
  linux-user: fix fadvise64_64() on ppc
  linux-user: fix eventfd
  linux-user: call fd_trans_target_to_host_data() for write()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 171 insertions, 6 deletions

diff --git a/linux-user/strace.c b/linux-user/strace.c
index 8fb1b6e252..d821d165ff 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -188,6 +188,93 @@ static void print_si_code(int arg)
     gemu_log("%s", codename);
 }
 
+static void get_target_siginfo(target_siginfo_t *tinfo,
+                                const target_siginfo_t *info)
+{
+    abi_ulong sival_ptr;
+
+    int sig;
+    int si_errno;
+    int si_code;
+    int si_type;
+
+    __get_user(sig, &info->si_signo);
+    __get_user(si_errno, &tinfo->si_errno);
+    __get_user(si_code, &info->si_code);
+
+    tinfo->si_signo = sig;
+    tinfo->si_errno = si_errno;
+    tinfo->si_code = si_code;
+
+    /* Ensure we don't leak random junk to the guest later */
+    memset(tinfo->_sifields._pad, 0, sizeof(tinfo->_sifields._pad));
+
+    /* This is awkward, because we have to use a combination of
+     * the si_code and si_signo to figure out which of the union's
+     * members are valid. (Within the host kernel it is always possible
+     * to tell, but the kernel carefully avoids giving userspace the
+     * high 16 bits of si_code, so we don't have the information to
+     * do this the easy way...) We therefore make our best guess,
+     * bearing in mind that a guest can spoof most of the si_codes
+     * via rt_sigqueueinfo() if it likes.
+     *
+     * Once we have made our guess, we record it in the top 16 bits of
+     * the si_code, so that print_siginfo() later can use it.
+     * print_siginfo() will strip these top bits out before printing
+     * the si_code.
+     */
+
+    switch (si_code) {
+    case SI_USER:
+    case SI_TKILL:
+    case SI_KERNEL:
+        /* Sent via kill(), tkill() or tgkill(), or direct from the kernel.
+         * These are the only unspoofable si_code values.
+         */
+        __get_user(tinfo->_sifields._kill._pid, &info->_sifields._kill._pid);
+        __get_user(tinfo->_sifields._kill._uid, &info->_sifields._kill._uid);
+        si_type = QEMU_SI_KILL;
+        break;
+    default:
+        /* Everything else is spoofable. Make best guess based on signal */
+        switch (sig) {
+        case TARGET_SIGCHLD:
+            __get_user(tinfo->_sifields._sigchld._pid,
+                       &info->_sifields._sigchld._pid);
+            __get_user(tinfo->_sifields._sigchld._uid,
+                       &info->_sifields._sigchld._uid);
+            __get_user(tinfo->_sifields._sigchld._status,
+                       &info->_sifields._sigchld._status);
+            __get_user(tinfo->_sifields._sigchld._utime,
+                       &info->_sifields._sigchld._utime);
+            __get_user(tinfo->_sifields._sigchld._stime,
+                       &info->_sifields._sigchld._stime);
+            si_type = QEMU_SI_CHLD;
+            break;
+        case TARGET_SIGIO:
+            __get_user(tinfo->_sifields._sigpoll._band,
+                       &info->_sifields._sigpoll._band);
+            __get_user(tinfo->_sifields._sigpoll._fd,
+                       &info->_sifields._sigpoll._fd);
+            si_type = QEMU_SI_POLL;
+            break;
+        default:
+            /* Assume a sigqueue()/mq_notify()/rt_sigqueueinfo() source. */
+            __get_user(tinfo->_sifields._rt._pid, &info->_sifields._rt._pid);
+            __get_user(tinfo->_sifields._rt._uid, &info->_sifields._rt._uid);
+            /* XXX: potential problem if 64 bit */
+            __get_user(sival_ptr, &info->_sifields._rt._sigval.sival_ptr);
+            tinfo->_sifields._rt._sigval.sival_ptr = sival_ptr;
+
+            si_type = QEMU_SI_RT;
+            break;
+        }
+        break;
+    }
+
+    tinfo->si_code = deposit32(si_code, 16, 16, si_type);
+}
+
 static void print_siginfo(const target_siginfo_t *tinfo)
 {
     /* Print a target_siginfo_t in the format desired for printing
@@ -206,26 +293,26 @@ static void print_siginfo(const target_siginfo_t *tinfo)
 
     switch (si_type) {
     case QEMU_SI_KILL:
-        gemu_log(", si_pid = %u, si_uid = %u",
+        gemu_log(", si_pid=%u, si_uid=%u",
                  (unsigned int)tinfo->_sifields._kill._pid,
                  (unsigned int)tinfo->_sifields._kill._uid);
         break;
     case QEMU_SI_TIMER:
-        gemu_log(", si_timer1 = %u, si_timer2 = %u",
+        gemu_log(", si_timer1=%u, si_timer2=%u",
                  tinfo->_sifields._timer._timer1,
                  tinfo->_sifields._timer._timer2);
         break;
     case QEMU_SI_POLL:
-        gemu_log(", si_band = %d, si_fd = %d",
+        gemu_log(", si_band=%d, si_fd=%d",
                  tinfo->_sifields._sigpoll._band,
                  tinfo->_sifields._sigpoll._fd);
         break;
     case QEMU_SI_FAULT:
-        gemu_log(", si_addr = ");
+        gemu_log(", si_addr=");
         print_pointer(tinfo->_sifields._sigfault._addr, 1);
         break;
     case QEMU_SI_CHLD:
-        gemu_log(", si_pid = %u, si_uid = %u, si_status = %d"
+        gemu_log(", si_pid=%u, si_uid=%u, si_status=%d"
                  ", si_utime=" TARGET_ABI_FMT_ld
                  ", si_stime=" TARGET_ABI_FMT_ld,
                  (unsigned int)(tinfo->_sifields._sigchld._pid),
@@ -235,7 +322,7 @@ static void print_siginfo(const target_siginfo_t *tinfo)
                  tinfo->_sifields._sigchld._stime);
         break;
     case QEMU_SI_RT:
-        gemu_log(", si_pid = %u, si_uid = %u, si_sigval = " TARGET_ABI_FMT_ld,
+        gemu_log(", si_pid=%u, si_uid=%u, si_sigval=" TARGET_ABI_FMT_ld,
                  (unsigned int)tinfo->_sifields._rt._pid,
                  (unsigned int)tinfo->_sifields._rt._uid,
                  tinfo->_sifields._rt._sigval.sival_ptr);
@@ -1901,6 +1988,57 @@ print_rt_sigprocmask(const struct syscallname *name,
 }
 #endif
 
+#ifdef TARGET_NR_rt_sigqueueinfo
+static void
+print_rt_sigqueueinfo(const struct syscallname *name,
+    abi_long arg0, abi_long arg1, abi_long arg2,
+    abi_long arg3, abi_long arg4, abi_long arg5)
+{
+    void *p;
+    target_siginfo_t uinfo;
+
+    print_syscall_prologue(name);
+    print_raw_param("%d", arg0, 0);
+    print_signal(arg1, 0);
+    p = lock_user(VERIFY_READ, arg2, sizeof(target_siginfo_t), 1);
+    if (p) {
+        get_target_siginfo(&uinfo, p);
+        print_siginfo(&uinfo);
+
+        unlock_user(p, arg2, 0);
+    } else {
+        print_pointer(arg2, 1);
+    }
+    print_syscall_epilogue(name);
+}
+#endif
+
+#ifdef TARGET_NR_rt_tgsigqueueinfo
+static void
+print_rt_tgsigqueueinfo(const struct syscallname *name,
+    abi_long arg0, abi_long arg1, abi_long arg2,
+    abi_long arg3, abi_long arg4, abi_long arg5)
+{
+    void *p;
+    target_siginfo_t uinfo;
+
+    print_syscall_prologue(name);
+    print_raw_param("%d", arg0, 0);
+    print_raw_param("%d", arg1, 0);
+    print_signal(arg2, 0);
+    p = lock_user(VERIFY_READ, arg3, sizeof(target_siginfo_t), 1);
+    if (p) {
+        get_target_siginfo(&uinfo, p);
+        print_siginfo(&uinfo);
+
+        unlock_user(p, arg3, 0);
+    } else {
+        print_pointer(arg3, 1);
+    }
+    print_syscall_epilogue(name);
+}
+#endif
+
 #ifdef TARGET_NR_syslog
 static void
 print_syslog_action(abi_ulong arg, int last)
@@ -2415,6 +2553,33 @@ print_kill(const struct syscallname *name,
 }
 #endif
 
+#ifdef TARGET_NR_tkill
+static void
+print_tkill(const struct syscallname *name,
+    abi_long arg0, abi_long arg1, abi_long arg2,
+    abi_long arg3, abi_long arg4, abi_long arg5)
+{
+    print_syscall_prologue(name);
+    print_raw_param("%d", arg0, 0);
+    print_signal(arg1, 1);
+    print_syscall_epilogue(name);
+}
+#endif
+
+#ifdef TARGET_NR_tgkill
+static void
+print_tgkill(const struct syscallname *name,
+    abi_long arg0, abi_long arg1, abi_long arg2,
+    abi_long arg3, abi_long arg4, abi_long arg5)
+{
+    print_syscall_prologue(name);
+    print_raw_param("%d", arg0, 0);
+    print_raw_param("%d", arg1, 0);
+    print_signal(arg2, 1);
+    print_syscall_epilogue(name);
+}
+#endif
+
 /*
  * An array of all of the syscalls we know about
  */