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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>		1 month ago
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aarch64	linux-user/aarch64: Enable GCS in HWCAP	2 months ago
alpha	target/alpha: Simplify call_pal implementation	2 months ago
arm	accel/tcg: Add clear_flags argument to page_set_flags	2 months ago
generic	linux-user: Move TARGET_SA_RESTORER out of generic/signal.h	10 months ago
hexagon	linux-user/hexagon: Use an array for GPRs	2 months ago
hppa	accel/tcg: Add clear_flags argument to page_set_flags	2 months ago
i386	linux-user: Populate sigreturn_region_{start,end} in all vdso.S	2 months ago
include	linux-user: cleanup unused linux-user/include/host directories	2 years ago
loongarch64	linux-user: Populate sigreturn_region_{start,end} in all vdso.S	2 months ago
m68k	bsd-user, linux-user: introduce qemu_process_cpu_events	3 months ago
microblaze	linux-user/microblaze: Fix little-endianness binary	2 months ago
mips	bsd-user, linux-user: introduce qemu_process_cpu_events	3 months ago
mips64	linux-user: Standardize on ELF_MACHINE not ELF_ARCH	3 months ago
openrisc	bsd-user, linux-user: introduce qemu_process_cpu_events	3 months ago
ppc	linux-user: Populate sigreturn_region_{start,end} in all vdso.S	2 months ago
riscv	linux-user: Populate sigreturn_region_{start,end} in all vdso.S	2 months ago
s390x	linux-user: Populate sigreturn_region_{start,end} in all vdso.S	2 months ago
sh4	bsd-user, linux-user: introduce qemu_process_cpu_events	3 months ago
sparc	bsd-user, linux-user: introduce qemu_process_cpu_events	3 months ago
x86_64	accel/tcg: Add clear_flags argument to page_set_flags	2 months ago
xtensa	bsd-user, linux-user: introduce qemu_process_cpu_events	3 months ago
elfload.c	linux-user: Support MADV_DONTDUMP, MADV_DODUMP	2 months ago
errnos.c.inc	linux-user: Simplify host <-> target errno conversion using macros	4 years ago
exit.c	accel/tcg: Move perf and debuginfo support to tcg/	2 years ago
fd-trans.c	linux-user: netlink: Add missing QEMU_IFLA entries	10 months ago
fd-trans.h	linux-user: Hold the fd-trans lock across fork	5 months ago
flat.h	linux-user/flatload.c: Remove unused bFLT shared-library and ZFLAT code	2 years ago
flatload.c	include/exec: Split out mmap-lock.h	8 months ago
gen-vdso-elfn.c.inc	linux-user: Create vdso_sigreturn_region_{start,end}	2 months ago
gen-vdso.c	linux-user: Create vdso_sigreturn_region_{start,end}	2 months ago
ioctls.h	linux-user: Use correct type for FIBMAP and FIGETBSZ emulation	1 month ago
linux_loop.h	linux-user: implement more loop ioctls	4 years ago
linuxload.c	linux-user: Create do_init_main_thread	3 months ago
loader.h	linux-user: Create vdso_sigreturn_region_{start,end}	2 months ago
main.c	linux-user: Add syscall dispatch support	2 months ago
meson.build	plugins: fix inclusion of user-mode APIs	5 months ago
mmap.c	linux-user: Support MADV_DONTDUMP, MADV_DODUMP	2 months ago
plugin-api.c	plugins: fix inclusion of user-mode APIs	5 months ago
qemu.h	linux-user/aarch64: Implement prctls for GCS	2 months ago
semihost.c	semihosting: Remove qemu_semihosting_console_outs	3 years ago
signal-common.h	linux-user: Add syscall dispatch support	2 months ago
signal.c	linux-user: Create vdso_sigreturn_region_{start,end}	2 months ago
socket.h	Supply missing header guards	7 years ago
strace.c	linux-user: avoid -Werror=int-in-bool-context	2 months ago
strace.h	linux-user: Have do_syscall() use CPUArchState* instead of void*	4 years ago
strace.list	linux-user: Add strace for rseq	3 months ago
syscall.c	linux-user: permit sendto() with NULL buf and 0 len	1 month ago
syscall_defs.h	linux-user: Add syscall dispatch support	2 months ago
syscall_types.h	linux-user: Add FITRIM ioctl	2 years ago
thunk.c	user: Move 'thunk.h' from 'exec/user' to 'user'	2 years ago
trace-events	linux-user: Rename user_force_sig tracepoint to match function name	4 years ago
trace.h	trace: switch position of headers to what Meson requires	5 years ago
uaccess.c	meson: Make DEBUG_REMAP a meson option	2 years ago
uname.c	linux-user: Remove pointless CPU{ARCH}State casts	4 years ago
uname.h	linux-user: Have do_syscall() use CPUArchState* instead of void*	4 years ago
user-internals.h	linux-user: Split out begin_parallel_context	2 months ago
user-mmap.h	user: Extract common MMAP API to 'user/mmap.h'	9 months ago
vm86.c	linux-user/vm86: Fix compilation with Clang	1 year ago