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qemu/linux-user
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Helge Deller 3f0744f98b linux-user: Allow sendmsg() without IOV 
Applications do call sendmsg() without any IOV, e.g.:
 sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=NULL, msg_iovlen=0,
            msg_control=[{cmsg_len=36, cmsg_level=SOL_ALG, cmsg_type=0x2}],
            msg_controllen=40, msg_flags=0}, MSG_MORE) = 0
 sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="The quick brown fox jumps over t"..., iov_len=183}],
            msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_ALG, cmsg_type=0x3}],
            msg_controllen=24, msg_flags=0}, 0) = 183

The function do_sendrecvmsg_locked() is used for sndmsg() and recvmsg()
and calls lock_iovec() to lock the IOV into memory. For the first
sendmsg() above it returns NULL and thus wrongly skips the call the host
sendmsg() syscall, which will break the calling application.

Fix this issue by:
- allowing sendmsg() even with empty IOV
- skip recvmsg() if IOV is NULL
- skip both if the return code of do_sendrecvmsg_locked() != 0, which
  indicates some failure like EFAULT on the IOV

Tested with the debian "ell" package with hppa guest on x86_64 host.

Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20221212173416.90590-2-deller@gmx.de>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2023-02-03 22:55:12 +01:00
..
aarch64 linux-user: move target_flat.h to target subdirs 2023-02-03 22:55:12 +01:00
alpha linux-user: Provide MADV_* definitions 2022-09-27 09:30:09 +02:00
arm linux-user: move target_flat.h to target subdirs 2023-02-03 22:55:12 +01:00
cris linux-user: Provide MADV_* definitions 2022-09-27 09:30:09 +02:00
generic linux-user: move target_flat.h to target subdirs 2023-02-03 22:55:12 +01:00
hexagon linux-user/hexagon: fix signal context save & restore 2023-01-05 09:19:02 -08:00
hppa linux-user/hppa: Detect glibc ABORT_INSTRUCTION and EXCP_BREAK handler 2022-11-02 17:14:02 +01:00
i386 linux-user: Add guest memory layout to exception dump 2022-10-25 09:20:40 +02:00
include linux-user/host/s390: Add vector instructions to host_signal_write() 2022-09-23 15:16:16 +02:00
loongarch64 linux-user: Provide MADV_* definitions 2022-09-27 09:30:09 +02:00
m68k linux-user: move target_flat.h to target subdirs 2023-02-03 22:55:12 +01:00
microblaze linux-user: move target_flat.h to target subdirs 2023-02-03 22:55:12 +01:00
mips linux-user: Provide MADV_* definitions 2022-09-27 09:30:09 +02:00
mips64 linux-user: Provide MADV_* definitions 2022-09-27 09:30:09 +02:00
nios2 linux-user: Provide MADV_* definitions 2022-09-27 09:30:09 +02:00
openrisc linux-user: Provide MADV_* definitions 2022-09-27 09:30:09 +02:00
ppc linux-user: Provide MADV_* definitions 2022-09-27 09:30:09 +02:00
riscv linux-user: Provide MADV_* definitions 2022-09-27 09:30:09 +02:00
s390x linux-user/s390x: Save/restore fpc when handling a signal 2022-09-27 13:19:05 +02:00
sh4 linux-user: move target_flat.h to target subdirs 2023-02-03 22:55:12 +01:00
sparc linux-user: Provide MADV_* definitions 2022-09-27 09:30:09 +02:00
x86_64 linux-user: Provide MADV_* definitions 2022-09-27 09:30:09 +02:00
xtensa linux-user: Provide MADV_* definitions 2022-09-27 09:30:09 +02:00
cpu_loop-common.h linux-user: Add guest memory layout to exception dump 2022-10-25 09:20:40 +02:00
elfload.c accel/tcg: Add debuginfo support 2023-01-16 10:14:12 -10:00
errnos.c.inc linux-user: Simplify host <-> target errno conversion using macros 2021-07-12 21:53:35 +02:00
exit.c tcg: add perfmap and jitdump 2023-01-16 10:14:12 -10:00
fd-trans.c linux-user: Fix inotify on aarch64 2022-01-27 16:58:33 +01:00
fd-trans.h fd-trans: Fix race condition on reallocation of the translation table. 2021-07-12 21:54:46 +02:00
flat.h linux-user/: fix some comment spelling errors 2020-09-17 20:39:22 +02:00
flatload.c linux-user/flatload.c: Fix setting of image_info::end_code 2022-07-28 19:17:24 +02:00
ioctls.h linux-user: remove conditionals for many fs.h ioctls 2022-10-21 17:46:19 +02:00
linux_loop.h linux-user: implement more loop ioctls 2021-11-29 14:54:17 +01:00
linuxload.c linux-user: Clean up arg_start/arg_end confusion 2022-05-23 08:15:19 +02:00
loader.h linux-user: Split loader-related prototypes into loader.h 2021-09-13 20:35:44 +02:00
main.c tcg: add perfmap and jitdump 2023-01-16 10:14:12 -10:00
meson.build accel/tcg: Add debuginfo support 2023-01-16 10:14:12 -10:00
mmap.c linux-user: Add emulation for MADV_WIPEONFORK and MADV_KEEPONFORK in madvise() 2023-02-03 22:55:12 +01:00
qemu.h linux-user: Honor PT_GNU_STACK 2022-09-06 08:04:25 +01:00
semihost.c semihosting: Remove qemu_semihosting_console_outs 2022-06-28 04:41:20 +05:30
signal-common.h linux-user: Add missing signals in strace output 2022-09-27 09:29:33 +02:00
signal.c linux-user: Clean up when exiting due to a signal 2023-01-16 10:14:12 -10:00
socket.h Supply missing header guards 2019-06-12 13:20:21 +02:00
strace.c linux-user: Show 4th argument of rt_sigprocmask() in strace 2023-02-03 22:55:12 +01:00
strace.h linux-user: Have do_syscall() use CPUArchState* instead of void* 2022-05-23 22:47:19 +02:00
strace.list linux-user: Enhance strace output for various syscalls 2023-02-03 22:55:12 +01:00
syscall.c linux-user: Allow sendmsg() without IOV 2023-02-03 22:55:12 +01:00
syscall_defs.h linux-user: Fix struct statfs ABI on loongarch64 2022-10-17 10:28:35 +08:00
syscall_types.h linux-user: implement more loop ioctls 2021-11-29 14:54:17 +01:00
thunk.c linux-user: Move thunk.c from top-level 2021-12-20 10:12:29 -08:00
trace-events linux-user: Rename user_force_sig tracepoint to match function name 2022-01-18 12:41:42 +01:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
uaccess.c linux-user: Split linux-user internals out of qemu.h 2021-09-13 20:35:45 +02:00
uname.c linux-user: Remove pointless CPU{ARCH}State casts 2022-05-23 22:47:20 +02:00
uname.h linux-user: Have do_syscall() use CPUArchState* instead of void* 2022-05-23 22:47:19 +02:00
user-internals.h linux-user: Add partial support for MADV_DONTNEED 2022-06-24 10:00:00 +02:00
user-mmap.h linux-user: Add partial support for MADV_DONTNEED 2022-06-24 10:00:00 +02:00
vm86.c linux-user: Split linux-user internals out of qemu.h 2021-09-13 20:35:45 +02:00