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[PULL,36/39] linux-user: Bound mmap_min_addr by host page size

Message ID 20240222204323.268539-37-richard.henderson@linaro.org
State Superseded
Headers show
Series [PULL,01/39] tcg/aarch64: Apple does not align __int128_t in even registers | expand

Commit Message

Richard Henderson Feb. 22, 2024, 8:43 p.m. UTC 
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>
---
 linux-user/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/linux-user/main.c b/linux-user/main.c
index 12bb839982..551acf1661 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -901,7 +901,7 @@  int main(int argc, char **argv, char **envp)
         if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
             unsigned long tmp;
             if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) {
-                mmap_min_addr = tmp;
+                mmap_min_addr = MAX(tmp, host_page_size);
                 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n",
                               mmap_min_addr);
             }