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[PATCH v3 4/5] linux-user: Add x86_64 vsyscall page to /proc/self/maps
From: |
Richard Henderson |
Subject: |
[PATCH v3 4/5] linux-user: Add x86_64 vsyscall page to /proc/self/maps |
Date: |
Wed, 12 Feb 2020 19:22:22 -0800 |
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>
---
v3: Use TARGET_VSYSCALL_PAGE.
---
linux-user/syscall.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index d60142f069..b684727b83 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7012,6 +7012,16 @@ static int open_self_maps(void *cpu_env, int fd)
}
}
+#ifdef TARGET_VSYSCALL_PAGE
+ /*
+ * We only support execution from the vsyscall page.
+ * This is as if CONFIG_LEGACY_VSYSCALL_XONLY=y from v5.3.
+ */
+ dprintf(fd, TARGET_FMT_lx "-" TARGET_FMT_lx
+ " --xp 00000000 00:00 0 [vsyscall]\n",
+ TARGET_VSYSCALL_PAGE, TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE);
+#endif
+
free(line);
fclose(fp);
--
2.20.1
- [PATCH v3 0/5] linux-user: Implement x86_64 vsyscalls, Richard Henderson, 2020/02/12
- [PATCH v3 1/5] target/i386: Renumber EXCP_SYSCALL, Richard Henderson, 2020/02/12
- [PATCH v3 2/5] linux-user/i386: Split out gen_signal, Richard Henderson, 2020/02/12
- [PATCH v3 3/5] linux-user/i386: Emulate x86_64 vsyscalls, Richard Henderson, 2020/02/12
- [PATCH v3 4/5] linux-user: Add x86_64 vsyscall page to /proc/self/maps,
Richard Henderson <=
- [PATCH v3 5/5] linux-user: Flush out implementation of gettimeofday, Richard Henderson, 2020/02/12
- Re: [PATCH v3 0/5] linux-user: Implement x86_64 vsyscalls, no-reply, 2020/02/12
- Re: [PATCH v3 0/5] linux-user: Implement x86_64 vsyscalls, Richard Henderson, 2020/02/25