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xemu/linux-user
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Jonas Schievink 1d3d1b23e1 Zero out the host's msg_control buffer 
If this is not done, qemu would drop any control message after the first
one.

This is because glibc's `CMSG_NXTHDR` macro accesses the uninitialized
cmsghdr's length field in order to find out if the message fits into the
`msg_control` buffer, wrongly assuming that it doesn't because the
length field contains garbage. Accessing the length field is fine for
completed messages we receive from the kernel, but is - as far as I know
- not needed since the kernel won't return such an invalid cmsghdr in
the first place.

This is tracked as this glibc bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=13500

It's probably also a good idea to bail with an error if `CMSG_NXTHDR`
returns NULL but `TARGET_CMSG_NXTHDR` doesn't (ie. we still expect
cmsgs).

Signed-off-by: Jonas Schievink <jonasschievink@gmail.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20180711221244.31869-1-jonasschievink@gmail.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2018-07-15 16:04:38 +02:00
..
aarch64 linux-user: move generic signal definitions to generic/signal.h 2018-06-04 01:30:44 +02:00
alpha linux-user: Report error message on stderr, rather than stdout 2018-07-09 00:52:50 +02:00
arm linux-user: move generic signal definitions to generic/signal.h 2018-06-04 01:30:44 +02:00
cris linux-user: Report error message on stderr, rather than stdout 2018-07-09 00:52:50 +02:00
generic linux-user: move generic signal definitions to generic/signal.h 2018-06-04 01:30:44 +02:00
host linux-user: Fix register used for 6th and 7th syscall argument on aarch64 2018-02-18 18:52:32 +01:00
hppa linux-user/hppa: Fix typo in mknodat syscall 2018-06-11 14:45:44 +02:00
i386 linux-user: move generic signal definitions to generic/signal.h 2018-06-04 01:30:44 +02:00
m68k linux-user: move generic signal definitions to generic/signal.h 2018-06-04 01:30:44 +02:00
microblaze linux-user: Report error message on stderr, rather than stdout 2018-07-09 00:52:50 +02:00
mips linux-user: move mips signal definitions to mips/target_signal.h 2018-06-04 01:30:44 +02:00
mips64 linux-user: move mips signal definitions to mips/target_signal.h 2018-06-04 01:30:44 +02:00
nios2 linux-user: Do not report "syscall not implemented" by default 2018-07-09 00:52:04 +02:00
openrisc linux-user: Fix struct sigaltstack for openrisc 2018-07-03 22:40:33 +09:00
ppc target/ppc: Remove POWERPC_EXCP_STCX 2018-07-03 09:56:52 +10:00
riscv linux-user: move generic signal definitions to generic/signal.h 2018-06-04 01:30:44 +02:00
s390x linux-user: move generic signal definitions to generic/signal.h 2018-06-04 01:30:44 +02:00
sh4 linux-user: Report error message on stderr, rather than stdout 2018-07-09 00:52:50 +02:00
sparc linux-user: Report error message on stderr, rather than stdout 2018-07-09 00:52:50 +02:00
sparc64 linux-user/sparc64: Add inotify_rm_watch and tee syscalls 2018-06-11 14:47:45 +02:00
tilegx linux-user: move generic signal definitions to generic/signal.h 2018-06-04 01:30:44 +02:00
x86_64 linux-user: move generic signal definitions to generic/signal.h 2018-06-04 01:30:44 +02:00
xtensa linux-user: move generic signal definitions to generic/signal.h 2018-06-04 01:30:44 +02:00
cpu_loop-common.h linux-user: create a dummy per arch cpu_loop.c 2018-04-30 09:47:55 +02:00
elfload.c target/arm: Implement ARMv8.2-DotProd 2018-06-29 15:11:15 +01:00
errno_defs.h linux-user: Handle ERFKILL and EHWPOISON 2017-01-22 18:14:10 -08:00
exit.c linux-user: add gcov support to preexit_cleanup 2018-07-05 15:59:41 +01:00
flat.h
flatload.c linux-user: Use is_error() to avoid warnings and make the code clearer 2018-06-11 14:40:11 +02:00
ioctls.h linux-user: Implement ioctl cmd TIOCGPTPEER 2018-02-18 18:52:32 +01:00
linux_loop.h linux-user: Add loop control ioctls 2016-07-19 15:22:33 +03:00
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: fix mmap_find_vma_reserved() 2018-07-15 16:01:31 +02:00
Makefile.objs linux-user: introduce preexit_cleanup 2018-07-05 15:59:41 +01:00
mmap.c move public invalidate APIs out of translate-all.{c,h}, clean up 2018-06-28 19:05:30 +02:00
qemu.h linux-user: introduce preexit_cleanup 2018-07-05 15:59:41 +01:00
safe-syscall.S linux-user: Provide safe_syscall for fixing races between signals and syscalls 2016-05-27 14:49:51 +03:00
signal-common.h linux-user: introduce target_sigsp() and target_save_altstack() 2018-05-03 18:29:15 +02:00
signal.c linux-user: Implement signals for openrisc 2018-07-03 22:40:33 +09:00
socket.h linux-user: update ARCH_HAS_SOCKET_TYPES use 2018-05-25 10:10:55 +02:00
strace.c linux-user: fix O_TMPFILE handling 2017-10-16 16:00:56 +03:00
strace.list linux-user/strace: Improve recvmsg() output 2018-07-03 16:27:15 +02:00
syscall_defs.h linux-user: remove useless #if 2018-06-04 01:30:44 +02:00
syscall_types.h linux-user: Add FICLONE and FICLONERANGE ioctls 2017-02-16 15:29:30 +01:00
syscall.c Zero out the host's msg_control buffer 2018-07-15 16:04:38 +02:00
target_flat.h
trace-events trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
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 Clean up decorations and whitespace around header guards 2016-07-12 16:20:46 +02:00
vm86.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00