diff options
Diffstat (limited to 'sandbox/linux/suid/process_util_linux.c')
-rw-r--r-- | sandbox/linux/suid/process_util_linux.c | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/sandbox/linux/suid/process_util_linux.c b/sandbox/linux/suid/process_util_linux.c deleted file mode 100644 index d28d5766c3..0000000000 --- a/sandbox/linux/suid/process_util_linux.c +++ /dev/null @@ -1,80 +0,0 @@ -// Copyright (c) 2012 The Chromium Authors. All rights reserved. -// Use of this source code is governed by a BSD-style license that can be -// found in the LICENSE file. - -// The following is the C version of code from base/process_utils_linux.cc. -// We shouldn't link against C++ code in a setuid binary. - -// Needed for O_DIRECTORY, must be defined before fcntl.h is included -// (and it can be included earlier than the explicit #include below -// in some versions of glibc). -#define _GNU_SOURCE - -#include "sandbox/linux/suid/process_util.h" - -#include <fcntl.h> -#include <inttypes.h> -#include <limits.h> -#include <stddef.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <unistd.h> - -// Ranges for the current (oom_score_adj) and previous (oom_adj) -// flavors of OOM score. -static const int kMaxOomScore = 1000; -static const int kMaxOldOomScore = 15; - -// NOTE: This is not the only version of this function in the source: -// the base library (in process_util_linux.cc) also has its own C++ version. -bool AdjustOOMScore(pid_t process, int score) { - if (score < 0 || score > kMaxOomScore) - return false; - - char oom_adj[27]; // "/proc/" + log_10(2**64) + "\0" - // 6 + 20 + 1 = 27 - snprintf(oom_adj, sizeof(oom_adj), "/proc/%" PRIdMAX, (intmax_t)process); - - const int dirfd = open(oom_adj, O_RDONLY | O_DIRECTORY); - if (dirfd < 0) - return false; - - struct stat statbuf; - if (fstat(dirfd, &statbuf) < 0) { - close(dirfd); - return false; - } - if (getuid() != statbuf.st_uid) { - close(dirfd); - return false; - } - - int fd = openat(dirfd, "oom_score_adj", O_WRONLY); - if (fd < 0) { - // We failed to open oom_score_adj, so let's try for the older - // oom_adj file instead. - fd = openat(dirfd, "oom_adj", O_WRONLY); - if (fd < 0) { - // Nope, that doesn't work either. - close(dirfd); - return false; - } else { - // If we're using the old oom_adj file, the allowed range is now - // [0, kMaxOldOomScore], so we scale the score. This may result in some - // aliasing of values, of course. - score = score * kMaxOldOomScore / kMaxOomScore; - } - } - close(dirfd); - - char buf[11]; // 0 <= |score| <= kMaxOomScore; using log_10(2**32) + 1 size - snprintf(buf, sizeof(buf), "%d", score); - size_t len = strlen(buf); - - ssize_t bytes_written = write(fd, buf, len); - close(fd); - return (bytes_written == (ssize_t)len); -} |