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Aleksandr Sergeev 1af5215667 linux-user/syscall.c: Prevent acquiring clone_lock while fork() 
By the spec, fork() copies only the thread which executes it.
So it may happen, what while one thread is doing a fork,
another thread is holding `clone_lock` mutex
(e.g. doing a `fork()` or `exit()`).
So the child process is born with the mutex being held,
and there are nobody to release it.

As the thread executing do_syscall() is not considered running,
start_exclusive() does not protect us from the case.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/3226
Signed-off-by: Aleksandr Sergeev <sergeev0xef@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20260126151612.2176451-1-sergeev0xef@gmail.com>
(cherry picked from commit d22e9aec572396836782e993cb18d598e6012688)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2026-02-10 12:42:54 +03:00
..
aarch64 linux-user/aarch64/target_fcntl.h: add missing TARGET_O_LARGEFILE definition 2026-01-21 10:23:05 +03:00
alpha linux-user: Add missing termios baud rates 2026-01-24 23:47:45 +03:00
arm accel/tcg: Add clear_flags argument to page_set_flags 2025-10-14 07:30:39 -07:00
generic linux-user: Add missing termios baud rates 2026-01-24 23:47:45 +03:00
hexagon linux-user/hexagon: Use an array for GPRs 2025-10-17 13:45:46 -07:00
hppa linux-user: Add missing termios baud rates 2026-01-24 23:47:45 +03:00
i386 linux-user: Populate sigreturn_region_{start,end} in all vdso.S 2025-09-23 16:17:59 -07:00
include linux-user: cleanup unused linux-user/include/host directories 2023-08-08 20:44:08 +02:00
loongarch64 linux-user: Populate sigreturn_region_{start,end} in all vdso.S 2025-09-23 16:17:59 -07:00
m68k bsd-user, linux-user: introduce qemu_process_cpu_events 2025-09-17 19:00:56 +02:00
microblaze linux-user/microblaze: Fix little-endianness binary 2025-10-16 17:07:52 +02:00
mips linux-user: Add missing termios baud rates 2026-01-24 23:47:45 +03:00
mips64 linux-user: Standardize on ELF_MACHINE not ELF_ARCH 2025-08-30 07:04:04 +10:00
openrisc bsd-user, linux-user: introduce qemu_process_cpu_events 2025-09-17 19:00:56 +02:00
ppc linux-user: Add missing termios baud rates 2026-01-24 23:47:45 +03:00
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 linux-user: Add missing termios baud rates 2026-01-24 23:47:45 +03:00
sparc linux-user: Add missing termios baud rates 2026-01-24 23:47:45 +03:00
x86_64 accel/tcg: Add clear_flags argument to page_set_flags 2025-10-14 07:30:39 -07:00
xtensa bsd-user, linux-user: introduce qemu_process_cpu_events 2025-09-17 19:00:56 +02:00
elfload.c linux-user/elfload.c: Correction to HWCAP2 accessor 2026-01-13 00:32:10 +03:00
errnos.c.inc
exit.c accel/tcg: Move perf and debuginfo support to tcg/ 2024-01-29 21:04:10 +10:00
fd-trans.c linux-user: netlink: Add missing QEMU_IFLA entries 2025-01-24 13:58:40 +01:00
fd-trans.h linux-user: Hold the fd-trans lock across fork 2025-07-10 13:49:03 -06:00
flat.h linux-user/flatload.c: Remove unused bFLT shared-library and ZFLAT code 2024-04-25 10:21:06 +01:00
flatload.c include/exec: Split out mmap-lock.h 2025-04-23 14:08:17 -07:00
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: Add termios2 support 2026-01-24 23:47:45 +03:00
linux_loop.h
linuxload.c linux-user: Create do_init_main_thread 2025-08-28 06:39:25 +10:00
loader.h linux-user: Create vdso_sigreturn_region_{start,end} 2025-09-23 16:17:59 -07:00
main.c linux-user/syscall.c: Prevent acquiring clone_lock while fork() 2026-02-10 12:42:54 +03:00
meson.build plugins: fix inclusion of user-mode APIs 2025-07-14 11:42:49 +01:00
mmap.c linux-user: fix reserved_va page leak in do_munmap 2026-01-13 00:33:01 +03:00
plugin-api.c plugins: fix inclusion of user-mode APIs 2025-07-14 11:42:49 +01:00
qemu.h linux-user/aarch64: Implement prctls for GCS 2025-10-10 13:19:10 +01:00
semihost.c semihosting: Remove qemu_semihosting_console_outs 2022-06-28 04:41:20 +05:30
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: Add termios2 support 2026-01-24 23:47:45 +03:00
strace.h linux-user: Have do_syscall() use CPUArchState* instead of void* 2022-05-23 22:47:19 +02:00
strace.list linux-user: Add strace for rseq 2025-08-28 07:18:30 +10:00
syscall.c linux-user/syscall.c: Prevent acquiring clone_lock while fork() 2026-02-10 12:42:54 +03:00
syscall_defs.h linux-user: Add syscall dispatch support 2025-09-23 16:17:59 -07:00
syscall_types.h linux-user: Add termios2 support 2026-01-24 23:47:45 +03:00
thunk.c user: Move 'thunk.h' from 'exec/user' to 'user' 2024-05-03 17:21:20 +02:00
trace-events linux-user: Rename user_force_sig tracepoint to match function name 2022-01-18 12:41:42 +01:00
trace.h
uaccess.c meson: Make DEBUG_REMAP a meson option 2024-04-24 15:46:00 -07:00
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/syscall.c: Prevent acquiring clone_lock while fork() 2026-02-10 12:42:54 +03:00
user-mmap.h user: Extract common MMAP API to 'user/mmap.h' 2025-03-09 14:54:32 +01:00
vm86.c linux-user/vm86: Fix compilation with Clang 2024-10-13 10:34:00 -07:00