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15ad98536a
qemu/linux-user
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Helge Deller 15ad98536a linux-user: Fix qemu brk() to not zero bytes on current page 
The qemu brk() implementation is too aggressive and cleans remaining bytes
on the current page above the last brk address.

But some existing applications are buggy and read/write bytes above their
current heap address. On a phyiscal machine this does not trigger a
runtime error as long as the access happens on the same page. Additionally
the Linux kernel allocates only full pages and does no zeroing on already
allocated pages, even if the brk address is lowered.

Fix qemu to behave the same way as the kernel does. Do not touch already
allocated pages, and - when running with different page sizes of guest and
host - zero out only those memory areas where the host page size is bigger
than the guest page size.

Signed-off-by: Helge Deller <deller@gmx.de>
Tested-by: "Markus F.X.J. Oberhumer" <markus@oberhumer.com>
Fixes: 86f04735ac ("linux-user: Fix brk() to release pages")
Cc: qemu-stable@nongnu.org
Buglink: https://github.com/upx/upx/issues/683
2023-07-18 20:42:05 +02:00
..
aarch64 linux-user: Split TARGET_PROT_* out of syscall_defs.h 2023-07-15 08:02:32 +01:00
alpha linux-user: Split TARGET_MAP_* out of syscall_defs.h 2023-07-15 08:02:32 +01:00
arm include/exec: Change reserved_va semantics to last byte 2023-03-28 15:23:10 -07:00
cris linux-user: Provide MADV_* definitions 2022-09-27 09:30:09 +02:00
generic linux-user: Split TARGET_PROT_* out of syscall_defs.h 2023-07-15 08:02:32 +01:00
hexagon Hexagon (linux-user/hexagon): handle breakpoints 2023-05-18 12:40:52 -07:00
hppa linux-user: Split TARGET_MAP_* out of syscall_defs.h 2023-07-15 08:02:32 +01:00
i386 target/i386: emulate 64-bit ring 0 for linux-user if LM feature is set 2023-06-29 10:49:43 +02:00
include linux-user: Implment host/ppc/host-signal.h 2023-01-23 14:39:48 -10:00
loongarch64 target/loongarch: Add LSX data type VReg 2023-05-06 11:19:42 +08:00
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: Split TARGET_PROT_* out of syscall_defs.h 2023-07-15 08:02:32 +01:00
mips64 linux-user: Split TARGET_MAP_* out of syscall_defs.h 2023-07-15 08:02:32 +01:00
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: Split TARGET_MAP_* out of syscall_defs.h 2023-07-15 08:02:32 +01:00
riscv linux-user/riscv: Add syscall riscv_hwprobe 2023-07-10 22:29:15 +10:00
s390x linux-user/s390x: Fix single-stepping SVC 2023-06-05 07:27:23 +02:00
sh4 linux-user: move target_flat.h to target subdirs 2023-02-03 22:55:12 +01:00
sparc linux-user: Split TARGET_MAP_* out of syscall_defs.h 2023-07-15 08:02:32 +01:00
x86_64 linux-user: Provide MADV_* definitions 2022-09-27 09:30:09 +02:00
xtensa linux-user: Split TARGET_PROT_* out of syscall_defs.h 2023-07-15 08:02:32 +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/arm: Do not allocate a commpage at all for M-profile CPUs 2023-07-15 08:02:33 +01:00
errnos.c.inc linux-user: Simplify host <-> target errno conversion using macros 2021-07-12 21:53:35 +02:00
exit.c *: Add missing includes of qemu/plugin.h 2023-03-22 15:06:57 +00:00
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/: fix some comment spelling errors 2020-09-17 20:39:22 +02:00
flatload.c linux-user: Pass last not end to probe_guest_base 2023-03-28 15:23:10 -07:00
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/elfload: Introduce elf_hwcap_str() on s390x 2023-06-05 20:48:34 +02:00
main.c linux-user, bsd-user: Preserve incoming order of environment variables in the target 2023-06-13 11:28:53 +02:00
meson.build accel/tcg: Add debuginfo support 2023-01-16 10:14:12 -10:00
mmap.c linux-user: Simplify target_madvise 2023-07-15 08:02:33 +01:00
qemu.h accel/tcg: Return bool from page_check_range 2023-07-15 08:02:32 +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 gdbstub: move chunks of user code into own files 2023-03-07 20:44:04 +00:00
socket.h Supply missing header guards 2019-06-12 13:20:21 +02:00
strace.c linux-user: Populate more bits in mmap_flags_tbl 2023-07-15 08:02:32 +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: Improve strace output of pread64() and pwrite64() 2023-07-08 16:55:08 +02:00
syscall_defs.h linux-user: Split TARGET_PROT_* out of syscall_defs.h 2023-07-15 08:02:32 +01:00
syscall_types.h linux-user: implement more loop ioctls 2021-11-29 14:54:17 +01:00
syscall.c linux-user: Fix qemu brk() to not zero bytes on current page 2023-07-18 20:42:05 +02:00
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 linux-user: Pass last not end to probe_guest_base 2023-03-28 15:23:10 -07:00
user-mmap.h linux-user: Widen target_mmap offset argument to off_t 2023-07-15 08:02:32 +01:00
vm86.c linux-user: Split linux-user internals out of qemu.h 2021-09-13 20:35:45 +02:00