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linux-user: Adjust task_unmapped_base for reserved_va

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Ensure that the chosen values for mmap_next_start and
task_unmapped_base are within the guest address space.

Tested-by: Helge Deller <deller@gmx.de>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-08-02 14:25:27 -07:00
parent 0450cf0897
commit c8fb5cf97d
3 changed files with 64 additions and 16 deletions
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28
linux-user/main.c
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@ -821,6 +821,34 @@ int main(int argc, char **argv, char **envp)
reserved_va = max_reserved_va;
}
/*
* Temporarily disable
* "comparison is always false due to limited range of data type"
* due to comparison between (possible) uint64_t and uintptr_t.
*/
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wtype-limits"
/*
* Select an initial value for task_unmapped_base that is in range.
*/
if (reserved_va) {
if (TASK_UNMAPPED_BASE < reserved_va) {
task_unmapped_base = TASK_UNMAPPED_BASE;
} else {
/* The most common default formula is TASK_SIZE / 3. */
task_unmapped_base = TARGET_PAGE_ALIGN(reserved_va / 3);
}
} else if (TASK_UNMAPPED_BASE < UINTPTR_MAX) {
task_unmapped_base = TASK_UNMAPPED_BASE;
} else {
/* 32-bit host: pick something medium size. */
task_unmapped_base = 0x10000000;
}
mmap_next_start = task_unmapped_base;
#pragma GCC diagnostic pop
{
Error *err = NULL;
if (seed_optarg != NULL) {