| Message ID | 20200213032223.14643-5-richard.henderson@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | linux-user: Implement x86_64 vsyscalls | expand |
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);
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 <richard.henderson@linaro.org> --- v3: Use TARGET_VSYSCALL_PAGE. --- linux-user/syscall.c | 10 ++++++++++ 1 file changed, 10 insertions(+)