fix already in upstream From f17f4989fa193fa8279474c5462289a3cfe69aea Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Fri, 8 Aug 2014 09:40:25 +0900 Subject: [PATCH] linux-user: fix readlink handling with magic exe symlink The current code always returns the length of the path when it should be returning the number of bytes it wrote to the output string. Further, readlink is not supposed to append a NUL byte, but the current snprintf logic will always do just that. Even further, if you pass in a length of 0, you're suppoesd to get back an error (EINVAL), but the current logic just returns 0. Further still, if there was an error reading the symlink, we should not go ahead and try to read the target buffer as it is garbage. Simple test for the first two issues: $ cat test.c int main() { char buf[50]; size_t len; for (len = 0; len < 10; ++len) { memset(buf, '!', sizeof(buf)); ssize_t ret = readlink("/proc/self/exe", buf, len); buf[20] = '\0'; printf("readlink(/proc/self/exe, {%s}, %zu) = %zi\n", buf, len, ret); } return 0; } Now compare the output of the native: $ gcc test.c -o /tmp/x $ /tmp/x $ strace /tmp/x With what qemu does: $ armv7a-cros-linux-gnueabi-gcc test.c -o /tmp/x -static $ qemu-arm /tmp/x $ qemu-arm -strace /tmp/x Signed-off-by: Mike Frysinger Signed-off-by: Riku Voipio --- linux-user/syscall.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index fccf9f0..7c108ab 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -6636,11 +6636,22 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, p2 = lock_user(VERIFY_WRITE, arg2, arg3, 0); if (!p || !p2) { ret = -TARGET_EFAULT; + } else if (!arg3) { + /* Short circuit this for the magic exe check. */ + ret = -TARGET_EINVAL; } else if (is_proc_myself((const char *)p, "exe")) { char real[PATH_MAX], *temp; temp = realpath(exec_path, real); - ret = temp == NULL ? get_errno(-1) : strlen(real) ; - snprintf((char *)p2, arg3, "%s", real); + /* Return value is # of bytes that we wrote to the buffer. */ + if (temp == NULL) { + ret = get_errno(-1); + } else { + /* Don't worry about sign mismatch as earlier mapping + * logic would have thrown a bad address error. */ + ret = MIN(strlen(real), arg3); + /* We cannot NUL terminate the string. */ + memcpy(p2, real, ret); + } } else { ret = get_errno(readlink(path(p), p2, arg3)); } -- 2.0.0