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[PULL,v2,12/23] linux-user: Properly Handle semun Structure In Cross-Endian Situations

Message ID a65e2e0a038eed5a722fdc827341a2eb5b1d2e64.1408436940.git.riku.voipio@linaro.org
State New
Headers show

Commit Message

Riku Voipio Aug. 19, 2014, 8:32 a.m. UTC 
From: Tom Musta <tommusta@gmail.com>

The semun union used in the semctl system call contains both an int (val) and
pointers.  In cross-endian situations on 64 bit targets, the value passed to
semctl is an 8 byte (abi_long) value and thus does not have the 4-byte val
field in the correct location.  In order to rectify this, the other half
of the union must be accessed.  This is achieved in code by performing
a byte swap on the entire 8 byte union, followed by a 4-byte swap of the
first half.

Also, eliminate an extraneous (dead) line of code that sets target_su.val in
the IPC_SET/IPC_GET case.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
---
 linux-user/syscall.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)
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Patch

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 0113250..ba9dfc5 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -2652,9 +2652,18 @@  static inline abi_long do_semctl(int semid, int semnum, int cmd,
     switch( cmd ) {
 	case GETVAL:
 	case SETVAL:
-            arg.val = tswap32(target_su.val);
+            /* In 64 bit cross-endian situations, we will erroneously pick up
+             * the wrong half of the union for the "val" element.  To rectify
+             * this, the entire 8-byte structure is byteswapped, followed by
+	     * a swap of the 4 byte val field. In other cases, the data is
+	     * already in proper host byte order. */
+	    if (sizeof(target_su.val) != (sizeof(target_su.buf))) {
+		target_su.buf = tswapal(target_su.buf);
+		arg.val = tswap32(target_su.val);
+	    } else {
+		arg.val = target_su.val;
+	    }
             ret = get_errno(semctl(semid, semnum, cmd, arg));
-            target_su.val = tswap32(arg.val);
             break;
 	case GETALL:
 	case SETALL: