From 9a72708a58d7bcbc1ba036a44cea920a238b0312 Mon Sep 17 00:00:00 2001 From: Fabio Erculiani Date: Tue, 3 Jan 2012 09:38:34 +0000 Subject: [PATCH] linux-user: improve fake /proc/self/stat making `ps` not segfault. With the current fake /proc/self/stat implementation `ps` is segfaulting because it expects to read PID and argv[0] as first and second field respectively, with the latter being enclosed between backets. Reproducing is as easy as running: `ps` inside qemu-user chroot with /proc mounted. Signed-off-by: Fabio Erculiani Acked-by: Alexander Graf Signed-off-by: Alexander Graf --- linux-user/syscall.c | 19 +++++++++++++++---- 1 files changed, 15 insertions(+), 4 deletions(-) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 9ba51bf..3e8e3dd 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -4678,11 +4678,22 @@ static int open_self_stat(void *cpu_env, int fd) int len; uint64_t val = 0; - if (i == 27) { - /* stack bottom */ - val = start_stack; + if (i == 0) { + /* pid */ + val = getpid(); + snprintf(buf, sizeof(buf), "%"PRId64 " ", val); + } else if (i == 1) { + /* app name */ + snprintf(buf, sizeof(buf), "(%s) ", ts->bprm->argv[0]); + } else if (i == 27) { + /* stack bottom */ + val = start_stack; + snprintf(buf, sizeof(buf), "%"PRId64 " ", val); + } else { + /* for the rest, there is MasterCard */ + snprintf(buf, sizeof(buf), "0%c", i == 43 ? '\n' : ' '); } - snprintf(buf, sizeof(buf), "%"PRId64 "%c", val, i == 43 ? '\n' : ' '); + len = strlen(buf); if (write(fd, buf, len) != len) { return -1;