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Ilya Leoshkevich fb7f3572b1 linux-user: Tolerate CONFIG_LSM_MMAP_MIN_ADDR 
Running qemu-i386 on a system running with SELinux in enforcing mode
(more precisely: s390x trixie container on Fedora 40) fails with:

    qemu-i386: tests/tcg/i386-linux-user/sigreturn-sigmask: Unable to find a guest_base to satisfy all guest address mapping requirements
      00000000-ffffffff

The reason is that main() determines mmap_min_addr from
/proc/sys/vm/mmap_min_addr, but SELinux additionally defines
CONFIG_LSM_MMAP_MIN_ADDR, which is normally larger: 32K or 64K, but,
in general, can be anything. There is no portable way to query its
value: /boot/config, /proc/config and /proc/config.gz are distro- and
environment-specific.

Once the identity map fails, the magnitude of guest_base does not
matter, so fix by starting the search from 1M or 1G.

Cc: qemu-stable@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2598
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-ID: <20241023002558.34589-1-iii@linux.ibm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2024-11-16 08:42:24 -08:00
..
aarch64 linux-user,aarch64: move to syscalltbl file 2024-09-22 09:30:18 +02:00
alpha target/ppc: Fix lxvx/stxvx facility check 2024-09-27 10:32:29 +01:00
arm target/arm: Explicitly set 2-NaN propagation rule 2024-11-05 10:09:53 +00:00
generic linux-user: Split TARGET_PROT_* out of syscall_defs.h 2023-07-15 08:02:32 +01:00
hexagon linux-user,hexagon: move to syscalltbl file 2024-09-22 09:30:18 +02:00
hppa linux-user/hppa: fix -Werror=maybe-uninitialized false-positive 2024-10-02 16:14:29 +04:00
i386 linux-user/i386: Use explicit little-endian LD/ST API 2024-10-15 12:13:59 -03:00
include linux-user: cleanup unused linux-user/include/host directories 2023-08-08 20:44:08 +02:00
loongarch64 linux-user,loongarch: move to syscalltbl file 2024-09-22 09:30:18 +02:00
m68k target/ppc: Fix lxvx/stxvx facility check 2024-09-27 10:32:29 +01:00
microblaze target/ppc: Fix lxvx/stxvx facility check 2024-09-27 10:32:29 +01:00
mips target/ppc: Fix lxvx/stxvx facility check 2024-09-27 10:32:29 +01:00
mips64 target/ppc: Fix lxvx/stxvx facility check 2024-09-27 10:32:29 +01:00
openrisc linux-user,openrisc: move to syscalltbl file 2024-09-22 09:30:18 +02:00
ppc linux-user/ppc: Fix sigmask endianness issue in sigreturn 2024-10-22 13:45:03 -07:00
riscv linux-user,riscv: move to syscalltbl file 2024-09-22 09:30:18 +02:00
s390x target/ppc: Fix lxvx/stxvx facility check 2024-09-27 10:32:29 +01:00
sh4 target/ppc: Fix lxvx/stxvx facility check 2024-09-27 10:32:29 +01:00
sparc target/ppc: Fix lxvx/stxvx facility check 2024-09-27 10:32:29 +01:00
x86_64 target/ppc: Fix lxvx/stxvx facility check 2024-09-27 10:32:29 +01:00
xtensa target/ppc: Fix lxvx/stxvx facility check 2024-09-27 10:32:29 +01:00
cpu_loop-common.h linux-user: Add guest memory layout to exception dump 2022-10-25 09:20:40 +02:00
elfload.c linux-user: Tolerate CONFIG_LSM_MMAP_MIN_ADDR 2024-11-16 08:42:24 -08:00
errnos.c.inc linux-user: Simplify host <-> target errno conversion using macros 2021-07-12 21:53:35 +02:00
exit.c accel/tcg: Move perf and debuginfo support to tcg/ 2024-01-29 21:04:10 +10:00
fd-trans.c linux-user: handle netlink flag NLA_F_NESTED 2023-03-10 20:45:47 +01:00
fd-trans.h linux-user: fix timerfd read endianness conversion 2023-03-10 20:42:00 +01:00
flat.h linux-user/flatload.c: Remove unused bFLT shared-library and ZFLAT code 2024-04-25 10:21:06 +01:00
flatload.c linux-user/flatload: Take mmap_lock in load_flt_binary() 2024-10-08 06:28:46 -07:00
gen-vdso-elfn.c.inc linux-user: Fix GDB complaining about system-supplied DSO string table index 2024-11-05 10:36:08 +00:00
gen-vdso.c linux-user: Fix GDB complaining about system-supplied DSO string table index 2024-11-05 10:36:08 +00:00
ioctls.h linux-user: Add ioctl for BLKBSZSET 2024-06-05 09:04:30 -07:00
linux_loop.h linux-user: implement more loop ioctls 2021-11-29 14:54:17 +01:00
linuxload.c {linux,bsd}-user: Introduce get_task_state() 2024-03-06 12:35:19 +00:00
loader.h linux-user: Report AArch64 hwcap2 fields above bit 31 2023-11-02 13:36:45 +00:00
main.c linux-user: Allow custom rt signal mappings 2024-11-05 10:36:08 +00:00
meson.build linux-user,hexagon: move to syscalltbl file 2024-09-22 09:30:18 +02:00
mmap.c linux-user: Handle short reads in mmap_h_gt_g 2024-08-21 09:09:46 +10:00
qemu.h linux-user/i386: Emulate orig_ax 2024-10-13 10:05:51 -07:00
semihost.c semihosting: Remove qemu_semihosting_console_outs 2022-06-28 04:41:20 +05:30
signal-common.h linux-user: Allow custom rt signal mappings 2024-11-05 10:36:08 +00:00
signal.c linux-user: Allow custom rt signal mappings 2024-11-05 10:36:08 +00:00
socket.h Supply missing header guards 2019-06-12 13:20:21 +02:00
strace.c linux-user: Trace rt_sigprocmask's sigsets 2024-10-22 13:45:03 -07:00
strace.h linux-user: Have do_syscall() use CPUArchState* instead of void* 2022-05-23 22:47:19 +02:00
strace.list linux-user: Trace rt_sigprocmask's sigsets 2024-10-22 13:45:03 -07:00
syscall_defs.h linux-user: Fix build failure caused by missing __u64 on musl 2024-10-22 13:45:03 -07:00
syscall_types.h linux-user: Add FITRIM ioctl 2024-04-24 15:46:00 -07:00
syscall.c linux-user: Fix setreuid and setregid to use direct syscalls 2024-11-16 08:40:19 -08:00
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 trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
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: Remove unused handle_vm86_fault 2024-10-03 17:26:06 +03:00
user-mmap.h linux-user: Move shmat and shmdt implementations to mmap.c 2023-09-01 13:35:02 -07:00
vm86.c linux-user/vm86: Fix compilation with Clang 2024-10-13 10:34:00 -07:00