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linux-user: Adjust initial brk when interpreter is close to executable

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While we attempt to load a ET_DYN executable far away from
TASK_UNMAPPED_BASE, we are not completely in control of the
address space layout.  If the interpreter lands close to
the executable, leaving insufficient heap space, move brk.

Tested-by: Helge Deller <deller@gmx.de>
Signed-off-by: Helge Deller <deller@gmx.de>
[rth: Re-order after ELF_ET_DYN_BASE patch so that we do not
 "temporarily break" tsan, and also to minimize the changes required.
 Remove image_info.reserve_brk as unused.]
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Helge Deller 2023-08-02 16:14:01 -07:00 • committed by Richard Henderson
parent 1ea06ded0d
commit 1f356e8c01
2 changed files with 15 additions and 37 deletions
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linux-user/qemu.h
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@ -30,7 +30,6 @@ struct image_info {
abi_ulong start_data;
abi_ulong end_data;
abi_ulong brk;
abi_ulong reserve_brk;
abi_ulong start_mmap;
abi_ulong start_stack;
abi_ulong stack_limit;