21.07.2023 18:14, Michael Tokarev пишет:
19.07.2023 18:52, Helge Deller wrote:
qemu-user crashes immediately when running static binaries on the armhf
architecture. The problem is the memory layout where the executable is
loaded before the interpreter library, in which case the reserved brk
region clashes with the interpreter code and is released before qemu
tries to start the program.
At load time qemu calculates a brk value for interpreter and executable
each. The fix is to choose the higher one of both.
Signed-off-by: Helge Deller <[email protected]>
Cc: Andreas Schwab <[email protected]>
Cc: [email protected]
Reported-by: [email protected]
Closes: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1040981
---
linux-user/elfload.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index a26200d9f3..94951630b1 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -3615,6 +3615,13 @@ int load_elf_binary(struct linux_binprm *bprm, struct
image_info *info)
if (elf_interpreter) {
load_elf_interp(elf_interpreter, &interp_info, bprm->buf);
+ /*
+ * adjust brk address if the interpreter was loaded above the main
+ * executable, e.g. happens with static binaries on armhf
+ */
+ if (interp_info.brk > info->brk) {
+ info->brk = interp_info.brk;
+ }
I've added printf() inside this if() block, on arm64 it produces:
fixing brk: interp_info.brk=0x5502875358 info=>brk=0x5500032ec0
FWIW,
/mjt
