linux-user: Bound mmap_min_addr by host page size
Bizzarely, it is possible to set /proc/sys/vm/mmap_min_addr to a value below the host page size. Fix that. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com> Acked-by: Helge Deller <deller@gmx.de> Message-Id: <20240102015808.132373-32-richard.henderson@linaro.org>
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@ -901,7 +901,7 @@ int main(int argc, char **argv, char **envp)
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if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
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if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
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unsigned long tmp;
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unsigned long tmp;
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if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) {
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if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) {
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mmap_min_addr = tmp;
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mmap_min_addr = MAX(tmp, host_page_size);
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qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n",
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qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n",
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mmap_min_addr);
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mmap_min_addr);
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}
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}
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