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c7e35da348
qemu/linux-user
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Peter Maydell c7e35da348 linux-user: Handle negative values in timespec conversion 
In a struct timespec, both fields are signed longs. Converting
them from guest to host with code like
    host_ts->tv_sec = tswapal(target_ts->tv_sec);
mishandles negative values if the guest has 32-bit longs and
the host has 64-bit longs because tswapal()'s return type is
abi_ulong: the assignment will zero-extend into the host long
type rather than sign-extending it.

Make the conversion routines use __get_user() and __set_user()
instead: this automatically picks up the signedness of the
field type and does the correct kind of sign or zero extension.
It also handles the possibility that the target struct is not
sufficiently aligned for the host's requirements.

In particular, this fixes a hang when running the Linux Test Project
mq_timedsend01 and mq_timedreceive01 tests: one of the test cases
sets the timeout to -1 and expects an EINVAL failure, but we were
setting a very long timeout instead.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
2016-05-27 14:50:39 +03:00
..
aarch64 linux-user: remove unavailable syscalls from aarch64 2016-02-23 21:25:10 +02:00
alpha linux-user: Support for restarting system calls for Alpha targets 2016-05-27 14:49:50 +03:00
arm linux-user: Support for restarting system calls for ARM targets 2016-05-27 14:49:49 +03:00
cris linux-user: Support for restarting system calls for CRIS targets 2016-05-27 14:49:50 +03:00
host linux-user: Provide safe_syscall for fixing races between signals and syscalls 2016-05-27 14:49:51 +03:00
i386 linux-user: correct timerfd_create syscall numbers 2016-02-23 21:25:10 +02:00
m68k linux-user: Support for restarting system calls for M68K targets 2016-05-27 14:49:50 +03:00
microblaze linux-user: Support for restarting system calls for Microblaze targets 2016-05-27 14:49:51 +03:00
mips linux-user: Support for restarting system calls for MIPS targets 2016-05-27 14:49:49 +03:00
mips64 linux-user: Support for restarting system calls for MIPS targets 2016-05-27 14:49:49 +03:00
openrisc linux-user: Support for restarting system calls for OpenRISC targets 2016-05-27 14:49:50 +03:00
ppc linux-user: Support for restarting system calls for PPC targets 2016-05-27 14:49:49 +03:00
s390x linux-user: Support for restarting system calls for S390 targets 2016-05-27 14:49:50 +03:00
sh4 linux-user: Support for restarting system calls for SH4 targets 2016-05-27 14:49:49 +03:00
sparc linux-user: Support for restarting system calls for SPARC targets 2016-05-27 14:49:49 +03:00
sparc64 linux-user: Support for restarting system calls for SPARC targets 2016-05-27 14:49:49 +03:00
tilegx linux-user: Support for restarting system calls for tilegx targets 2016-05-27 14:49:50 +03:00
unicore32 build: [linux-user] Rename "syscall.h" to "target_syscall.h" in target directories 2016-02-23 21:25:09 +02:00
x86_64 linux-user: correct timerfd_create syscall numbers 2016-02-23 21:25:10 +02:00
elfload.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
errno_defs.h linux-user: Renumber TARGET_QEMU_ESIGRETURN, make it not arch-specific 2016-05-27 14:49:49 +03:00
flat.h Support for 32 bit ABI on 64 bit targets (only enabled Sparc64) 2007-10-14 16:27:31 +00:00
flatload.c osdep: add wrappers for socket functions 2016-03-10 17:19:07 +00:00
ioctls.h linux-user: Convert blkpg to use a special subop handler 2014-10-06 21:52:45 +03:00
linux_loop.h Fix build failure with old kernel headers (loop.h is incompatible with 2008-05-23 16:06:43 +00:00
linuxload.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00
m68k-sim.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00
main.c linux-user: Support for restarting system calls for Microblaze targets 2016-05-27 14:49:51 +03:00
Makefile.objs linux-user: Provide safe_syscall for fixing races between signals and syscalls 2016-05-27 14:49:51 +03:00
mmap.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00
qemu.h linux-user: Provide safe_syscall for fixing races between signals and syscalls 2016-05-27 14:49:51 +03:00
safe-syscall.S linux-user: Provide safe_syscall for fixing races between signals and syscalls 2016-05-27 14:49:51 +03:00
signal.c linux-user: Provide safe_syscall for fixing races between signals and syscalls 2016-05-27 14:49:51 +03:00
socket.h linux-user: support SO_PASSSEC setsockopt option 2014-06-29 14:19:59 +03:00
strace.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00
strace.list linux-user: add setns and unshare 2014-08-22 15:06:34 +03:00
syscall_defs.h linux-user: Add SOCKOP_sendmmsg and SOCKOP_recvmmsg socket call, wire them up. 2016-01-11 14:54:03 +02:00
syscall_types.h linux-user: Convert blkpg to use a special subop handler 2014-10-06 21:52:45 +03:00
syscall.c linux-user: Handle negative values in timespec conversion 2016-05-27 14:50:39 +03:00
target_flat.h linux-user/FLAT: allow targets to override FLAT processing 2011-02-09 10:33:54 +02:00
uaccess.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
uname.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00
uname.h linux-user: move uname functions to uname.c 2014-05-02 21:59:36 +03:00
vm86.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00