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[PATCH v2 4/5] linux-user: Add x86_64 vsyscall page to /proc/self/maps

From: Richard Henderson
Subject: [PATCH v2 4/5] linux-user: Add x86_64 vsyscall page to /proc/self/maps
Date: Thu, 16 Jan 2020 09:43:40 -1000

The page isn't (necessarily) present in the host /proc/self/maps,
and even if it might be it isn't present in page_flags, and even
if it was it might not have the same set of page permissions.

The easiest thing to do, particularly when it comes to the
"[vsyscall]" note at the end of line, is to special case it.

Signed-off-by: Richard Henderson <address@hidden>
 linux-user/syscall.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 171c0caef3..eb867a5296 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7005,6 +7005,15 @@ static int open_self_maps(void *cpu_env, int fd)
+#ifdef TARGET_X86_64
+    /*
+     * We only support execution from the vsyscall page.
+     * This is as if CONFIG_LEGACY_VSYSCALL_XONLY=y from v5.3.
+     */
+    dprintf(fd, "ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0"
+                "          [vsyscall]\n");

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