/* * sysctl - sysctl set/get helpers * Subject to the GPL, version 2. */ #include #include #include #include #include #include #include "built_in.h" #include "sysctl.h" int sysctl_set_int(const char *file, int value) { char path[PATH_MAX]; char str[64]; ssize_t ret; int fd; strncpy(path, SYSCTL_PROC_PATH, PATH_MAX); strncat(path, file, PATH_MAX - sizeof(SYSCTL_PROC_PATH) - 1); fd = open(path, O_WRONLY); if (unlikely(fd < 0)) return -1; ret = snprintf(str, 63, "%d", value); if (ret < 0) { close(fd); return -1; } ret = write(fd, str, strlen(str)); close(fd); return ret <= 0 ? -1 : 0; } int sysctl_get_int(const char *file, int *value) { char path[PATH_MAX]; char str[64]; ssize_t ret; int fd; strncpy(path, SYSCTL_PROC_PATH, PATH_MAX); strncat(path, file, PATH_MAX - sizeof(SYSCTL_PROC_PATH) - 1); fd = open(path, O_RDONLY); if (fd < 0) return -1; ret = read(fd, str, sizeof(str)); if (ret > 0) { *value = atoi(str); ret = 0; } else { ret = -1; } close(fd); return ret; } n> net-next plumbingsTobias Klauser
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authorMaxim Patlasov <mpatlasov@virtuozzo.com>2016-07-21 18:24:26 -0700
committerMiklos Szeredi <mszeredi@redhat.com>2016-07-22 10:54:20 +0200
commitcfc9fde0b07c3b44b570057c5f93dda59dca1c94 (patch)
tree7f36d4f2a49719673c436767707d25ef5f5e9041 /Documentation
parent07a2daab49c549a37b5b744cbebb6e3f445f12bc (diff)
ovl: verify upper dentry in ovl_remove_and_whiteout()
The upper dentry may become stale before we call ovl_lock_rename_workdir. For example, someone could (mistakenly or maliciously) manually unlink(2) it directly from upperdir. To ensure it is not stale, let's lookup it after ovl_lock_rename_workdir and and check if it matches the upper dentry. Essentially, it is the same problem and similar solution as in commit 11f3710417d0 ("ovl: verify upper dentry before unlink and rename"). Signed-off-by: Maxim Patlasov <mpatlasov@virtuozzo.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Cc: <stable@vger.kernel.org>
Diffstat (limited to 'Documentation')