Peter Maydell 0db2de22fc linux-user: permit sendto() with NULL buf and 0 len ...

If you pass sendto() a NULL buffer, this is usually an error
(causing an EFAULT return); however if you pass a 0 length then
we should not try to validate the buffer provided. Instead we
skip the copying of the user data and possible processing
through fd_trans_target_to_host_data, and call the host syscall
with NULL, 0.

(unlock_user() permits a NULL buffer pointer for "do nothing"
so we don't need to special case the unlock code.)

Cc: qemu-stable@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/3102
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20251028142001.3011630-1-peter.maydell@linaro.org>

2025-10-31 12:50:15 +01:00

..

aarch64

linux-user/aarch64: Enable GCS in HWCAP

2025-10-10 13:19:11 +01:00

alpha

target/alpha: Simplify call_pal implementation

2025-09-24 10:29:43 -07:00

arm

accel/tcg: Add clear_flags argument to page_set_flags

2025-10-14 07:30:39 -07:00

generic

…

hexagon

linux-user/hexagon: Use an array for GPRs

2025-10-17 13:45:46 -07:00

hppa

accel/tcg: Add clear_flags argument to page_set_flags

2025-10-14 07:30:39 -07:00

i386

linux-user: Populate sigreturn_region_{start,end} in all vdso.S

2025-09-23 16:17:59 -07:00

include

…

loongarch64

linux-user: Populate sigreturn_region_{start,end} in all vdso.S

2025-09-23 16:17:59 -07:00

m68k

…

microblaze

linux-user/microblaze: Fix little-endianness binary

2025-10-16 17:07:52 +02:00

mips

…

mips64

…

openrisc

…

ppc

linux-user: Populate sigreturn_region_{start,end} in all vdso.S

2025-09-23 16:17:59 -07:00

riscv

linux-user: Populate sigreturn_region_{start,end} in all vdso.S

2025-09-23 16:17:59 -07:00

s390x

linux-user: Populate sigreturn_region_{start,end} in all vdso.S

2025-09-23 16:17:59 -07:00

sh4

…

sparc

…

x86_64

accel/tcg: Add clear_flags argument to page_set_flags

2025-10-14 07:30:39 -07:00

xtensa

…

elfload.c

linux-user: Support MADV_DONTDUMP, MADV_DODUMP

2025-10-14 07:30:39 -07:00

errnos.c.inc

…

exit.c

…

fd-trans.c

…

fd-trans.h

…

flat.h

…

flatload.c

…

gen-vdso-elfn.c.inc

linux-user: Create vdso_sigreturn_region_{start,end}

2025-09-23 16:17:59 -07:00

gen-vdso.c

linux-user: Create vdso_sigreturn_region_{start,end}

2025-09-23 16:17:59 -07:00

ioctls.h

linux-user: Use correct type for FIBMAP and FIGETBSZ emulation

2025-10-29 11:58:55 +03:00

linux_loop.h

…

linuxload.c

…

loader.h

linux-user: Create vdso_sigreturn_region_{start,end}

2025-09-23 16:17:59 -07:00

main.c

linux-user: Add syscall dispatch support

2025-09-23 16:17:59 -07:00

meson.build

…

mmap.c

linux-user: Support MADV_DONTDUMP, MADV_DODUMP

2025-10-14 07:30:39 -07:00

plugin-api.c

…

qemu.h

linux-user/aarch64: Implement prctls for GCS

2025-10-10 13:19:10 +01:00

semihost.c

…

signal-common.h

linux-user: Add syscall dispatch support

2025-09-23 16:17:59 -07:00

signal.c

linux-user: Create vdso_sigreturn_region_{start,end}

2025-09-23 16:17:59 -07:00

socket.h

…

strace.c

linux-user: avoid -Werror=int-in-bool-context

2025-09-23 12:17:39 +02:00

strace.h

…

strace.list

…

syscall_defs.h

linux-user: Add syscall dispatch support

2025-09-23 16:17:59 -07:00

syscall_types.h

…

syscall.c

linux-user: permit sendto() with NULL buf and 0 len

2025-10-31 12:50:15 +01:00

thunk.c

…

trace-events

…

trace.h

…

uaccess.c

…

uname.c

…

uname.h

…

user-internals.h

linux-user: Split out begin_parallel_context

2025-09-24 10:29:43 -07:00

user-mmap.h

…

vm86.c

…