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258bec39f3
qemu/linux-user
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Helge Deller 258bec39f3 linux-user: Fix access to /proc/self/exe 
When accsssing /proc/self/exe from a userspace program, linux-user tries
to resolve the name via realpath(), which may fail if the process
changed the working directory in the meantime.

An example:
- a userspace program ist started with ./testprogram
- the program runs chdir("/tmp")
- then the program calls readlink("/proc/self/exe")
- linux-user tries to run realpath("./testprogram") which fails
  because ./testprogram isn't in /tmp
- readlink() will return -ENOENT back to the program

Avoid this issue by resolving the full path name of the started process
at startup of linux-user and store it in real_exec_path[]. This then
simplifies the emulation of readlink() and readlinkat() as well, because
they can simply copy the path string to userspace.

I noticed this bug because the testsuite of the debian package "pandoc"
failed on linux-user while it succeeded on real hardware.  The full log
is here:
https://buildd.debian.org/status/fetch.php?pkg=pandoc&arch=hppa&ver=2.17.1.1-1.1%2Bb1&stamp=1670153210&raw=0

Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20221205113825.20615-1-deller@gmx.de>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2023-03-10 20:41:30 +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 target/arm: Convert CPUARMState::eabi to boolean 2023-02-16 16:00:47 +00:00
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: Implment host/ppc/host-signal.h 2023-01-23 14:39:48 -10:00
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/microblaze: Handle privileged exception 2023-02-21 08:44:13 -10:00
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/sparc: Raise SIGILL for all unhandled software traps 2023-02-21 08:44:13 -10:00
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 linux-user: Fix access to /proc/self/exe 2023-03-10 20:41:30 +01:00
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_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
syscall.c linux-user: Fix access to /proc/self/exe 2023-03-10 20:41:30 +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 target/arm: Convert CPUARMState::eabi to boolean 2023-02-16 16:00:47 +00:00
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