[PULL,22/44] linux-user: Use both si_code and si_signo when converting siginfo_t

Commit Message

Riku Voipio June 8, 2016, 1:30 p.m. UTC

From: Peter Maydell <[e-mail]>

The siginfo_t struct includes a union. The correct way to identify
which fields of the union are relevant is complicated, 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 tswap_siginfo()
later can use it.  tswap_siginfo() then strips these top bits out
before writing si_code to the guest (sign-extending the lower bits).

This fixes a bug where fields were sometimes wrong; in particular
the LTP kill10 test went into an infinite loop because its signal
handler got a si_pid value of 0 rather than the pid of the sending
process.

As part of this change, we switch to using __put_user() in the
tswap_siginfo code which writes out the byteswapped values to
the target memory, in case the target memory pointer is not
sufficiently aligned for the host CPU's requirements.

Signed-off-by: Peter Maydell <[e-mail]>
Signed-off-by: Riku Voipio <[e-mail]>
---
 linux-user/signal.c       | 165 ++++++++++++++++++++++++++++++++--------------
 linux-user/syscall_defs.h |  15 +++++
 2 files changed, 131 insertions(+), 49 deletions(-)

Patch

diff --git a/linux-user/signal.c b/linux-user/signal.c
index b21d6bf..8ea0cbf 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -17,6 +17,7 @@ 
  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 #include "qemu/osdep.h"
+#include "qemu/bitops.h"
 #include <sys/ucontext.h>
 #include <sys/resource.h>
 
@@ -274,70 +275,129 @@  static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
                                                  const siginfo_t *info)
 {
     int sig = host_to_target_signal(info->si_signo);
+    int si_code = info->si_code;
+    int si_type;
     tinfo->si_signo = sig;
     tinfo->si_errno = 0;
     tinfo->si_code = info->si_code;
 
-    if (sig == TARGET_SIGILL || sig == TARGET_SIGFPE || sig == TARGET_SIGSEGV
-            || sig == TARGET_SIGBUS || sig == TARGET_SIGTRAP) {
-        /* Should never come here, but who knows. The information for
-           the target is irrelevant.  */
-        tinfo->_sifields._sigfault._addr = 0;
-    } else if (sig == TARGET_SIGIO) {
-        tinfo->_sifields._sigpoll._band = info->si_band;
-        tinfo->_sifields._sigpoll._fd = info->si_fd;
-    } else if (sig == TARGET_SIGCHLD) {
-        tinfo->_sifields._sigchld._pid = info->si_pid;
-        tinfo->_sifields._sigchld._uid = info->si_uid;
-        tinfo->_sifields._sigchld._status
+    /* 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 tswap_siginfo() later can use it.
+     * tswap_siginfo() will strip these top bits out before writing
+     * si_code to the guest (sign-extending the lower bits).
+     */
+
+    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.
+         */
+        tinfo->_sifields._kill._pid = info->si_pid;
+        tinfo->_sifields._kill._uid = info->si_uid;
+        si_type = QEMU_SI_KILL;
+        break;
+    default:
+        /* Everything else is spoofable. Make best guess based on signal */
+        switch (sig) {
+        case TARGET_SIGCHLD:
+            tinfo->_sifields._sigchld._pid = info->si_pid;
+            tinfo->_sifields._sigchld._uid = info->si_uid;
+            tinfo->_sifields._sigchld._status
                 = host_to_target_waitstatus(info->si_status);
-        tinfo->_sifields._sigchld._utime = info->si_utime;
-        tinfo->_sifields._sigchld._stime = info->si_stime;
-    } else if (sig >= TARGET_SIGRTMIN) {
-        tinfo->_sifields._rt._pid = info->si_pid;
-        tinfo->_sifields._rt._uid = info->si_uid;
-        /* XXX: potential problem if 64 bit */
-        tinfo->_sifields._rt._sigval.sival_ptr
+            tinfo->_sifields._sigchld._utime = info->si_utime;
+            tinfo->_sifields._sigchld._stime = info->si_stime;
+            si_type = QEMU_SI_CHLD;
+            break;
+        case TARGET_SIGIO:
+            tinfo->_sifields._sigpoll._band = info->si_band;
+            tinfo->_sifields._sigpoll._fd = info->si_fd;
+            si_type = QEMU_SI_POLL;
+            break;
+        default:
+            /* Assume a sigqueue()/mq_notify()/rt_sigqueueinfo() source. */
+            tinfo->_sifields._rt._pid = info->si_pid;
+            tinfo->_sifields._rt._uid = info->si_uid;
+            /* XXX: potential problem if 64 bit */
+            tinfo->_sifields._rt._sigval.sival_ptr
                 = (abi_ulong)(unsigned long)info->si_value.sival_ptr;
+            si_type = QEMU_SI_RT;
+            break;
+        }
+        break;
     }
+
+    tinfo->si_code = deposit32(si_code, 16, 16, si_type);
 }
 
 static void tswap_siginfo(target_siginfo_t *tinfo,
                           const target_siginfo_t *info)
 {
-    int sig = info->si_signo;
-    tinfo->si_signo = tswap32(sig);
-    tinfo->si_errno = tswap32(info->si_errno);
-    tinfo->si_code = tswap32(info->si_code);
-
-    if (sig == TARGET_SIGILL || sig == TARGET_SIGFPE || sig == TARGET_SIGSEGV
-        || sig == TARGET_SIGBUS || sig == TARGET_SIGTRAP) {
-        tinfo->_sifields._sigfault._addr
-            = tswapal(info->_sifields._sigfault._addr);
-    } else if (sig == TARGET_SIGIO) {
-        tinfo->_sifields._sigpoll._band
-            = tswap32(info->_sifields._sigpoll._band);
-        tinfo->_sifields._sigpoll._fd = tswap32(info->_sifields._sigpoll._fd);
-    } else if (sig == TARGET_SIGCHLD) {
-        tinfo->_sifields._sigchld._pid
-            = tswap32(info->_sifields._sigchld._pid);
-        tinfo->_sifields._sigchld._uid
-            = tswap32(info->_sifields._sigchld._uid);
-        tinfo->_sifields._sigchld._status
-            = tswap32(info->_sifields._sigchld._status);
-        tinfo->_sifields._sigchld._utime
-            = tswapal(info->_sifields._sigchld._utime);
-        tinfo->_sifields._sigchld._stime
-            = tswapal(info->_sifields._sigchld._stime);
-    } else if (sig >= TARGET_SIGRTMIN) {
-        tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid);
-        tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid);
-        tinfo->_sifields._rt._sigval.sival_ptr
-            = tswapal(info->_sifields._rt._sigval.sival_ptr);
+    int si_type = extract32(info->si_code, 16, 16);
+    int si_code = sextract32(info->si_code, 0, 16);
+
+    __put_user(info->si_signo, &tinfo->si_signo);
+    __put_user(info->si_errno, &tinfo->si_errno);
+    __put_user(si_code, &tinfo->si_code);
+
+    /* We can use our internal marker of which fields in the structure
+     * are valid, rather than duplicating the guesswork of
+     * host_to_target_siginfo_noswap() here.
+     */
+    switch (si_type) {
+    case QEMU_SI_KILL:
+        __put_user(info->_sifields._kill._pid, &tinfo->_sifields._kill._pid);
+        __put_user(info->_sifields._kill._uid, &tinfo->_sifields._kill._uid);
+        break;
+    case QEMU_SI_TIMER:
+        __put_user(info->_sifields._timer._timer1,
+                   &tinfo->_sifields._timer._timer1);
+        __put_user(info->_sifields._timer._timer2,
+                   &tinfo->_sifields._timer._timer2);
+        break;
+    case QEMU_SI_POLL:
+        __put_user(info->_sifields._sigpoll._band,
+                   &tinfo->_sifields._sigpoll._band);
+        __put_user(info->_sifields._sigpoll._fd,
+                   &tinfo->_sifields._sigpoll._fd);
+        break;
+    case QEMU_SI_FAULT:
+        __put_user(info->_sifields._sigfault._addr,
+                   &tinfo->_sifields._sigfault._addr);
+        break;
+    case QEMU_SI_CHLD:
+        __put_user(info->_sifields._sigchld._pid,
+                   &tinfo->_sifields._sigchld._pid);
+        __put_user(info->_sifields._sigchld._uid,
+                   &tinfo->_sifields._sigchld._uid);
+        __put_user(info->_sifields._sigchld._status,
+                   &tinfo->_sifields._sigchld._status);
+        __put_user(info->_sifields._sigchld._utime,
+                   &tinfo->_sifields._sigchld._utime);
+        __put_user(info->_sifields._sigchld._stime,
+                   &tinfo->_sifields._sigchld._stime);
+        break;
+    case QEMU_SI_RT:
+        __put_user(info->_sifields._rt._pid, &tinfo->_sifields._rt._pid);
+        __put_user(info->_sifields._rt._uid, &tinfo->_sifields._rt._uid);
+        __put_user(info->_sifields._rt._sigval.sival_ptr,
+                   &tinfo->_sifields._rt._sigval.sival_ptr);
+        break;
+    default:
+        g_assert_not_reached();
     }
 }
 
-
 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info)
 {
     host_to_target_siginfo_noswap(tinfo, info);
@@ -505,6 +565,13 @@  int queue_signal(CPUArchState *env, int sig, target_siginfo_t *info)
 
     trace_user_queue_signal(env, sig);
 
+    /* Currently all callers define siginfo structures which
+     * use the _sifields._sigfault union member, so we can
+     * set the type here. If that changes we should push this
+     * out so the si_type is passed in by callers.
+     */
+    info->si_code = deposit32(info->si_code, 16, 16, QEMU_SI_FAULT);
+
     ts->sync_signal.info = *info;
     ts->sync_signal.pending = sig;
     /* signal that a new signal is pending */
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 34af15a..124754f 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -673,6 +673,21 @@  typedef struct {
 
 #define TARGET_SI_PAD_SIZE ((TARGET_SI_MAX_SIZE - TARGET_SI_PREAMBLE_SIZE) / sizeof(int))
 
+/* Within QEMU the top 16 bits of si_code indicate which of the parts of
+ * the union in target_siginfo is valid. This only applies between
+ * host_to_target_siginfo_noswap() and tswap_siginfo(); it does not
+ * appear either within host siginfo_t or in target_siginfo structures
+ * which we get from the guest userspace program. (The Linux kernel
+ * does a similar thing with using the top bits for its own internal
+ * purposes but not letting them be visible to userspace.)
+ */
+#define QEMU_SI_KILL 0
+#define QEMU_SI_TIMER 1
+#define QEMU_SI_POLL 2
+#define QEMU_SI_FAULT 3
+#define QEMU_SI_CHLD 4
+#define QEMU_SI_RT 5
+
 typedef struct target_siginfo {
 #ifdef TARGET_MIPS
 	int si_signo;