Messages in this thread Patch in this message | | | From | Will Drewry <> | Subject | [PATCH v9 04/13] seccomp_filter: add process state reporting | Date | Thu, 23 Jun 2011 19:36:43 -0500 |
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Adds seccomp and seccomp_filter status reporting to proc. /proc/<pid>/seccomp_filter provides the current seccomp mode and the list of allowed or dynamically filtered system calls.
v9: rebase on to bccaeafd7c117acee36e90d37c7e05c19be9e7bf v8: - v7: emit seccomp mode directly v6: - v5: fix typos when mailing the wrong patch series v4: move from rcu guard to mutex guard v3: changed to using filters directly. v2: removed status entry, added seccomp file. (requested by kosaki.motohiro@jp.fujitsu.com) allowed S_IRUGO reading of entries (requested by viro@zeniv.linux.org.uk) added flags got rid of the seccomp_t type dropped seccomp file
Signed-off-by: Will Drewry <wad@chromium.org> --- fs/proc/base.c | 31 +++++++++++++++++++++++++++++++ 1 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/fs/proc/base.c b/fs/proc/base.c index 8a84210..52e1314 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -73,6 +73,7 @@ #include <linux/security.h> #include <linux/ptrace.h> #include <linux/tracehook.h> +#include <linux/seccomp.h> #include <linux/cgroup.h> #include <linux/cpuset.h> #include <linux/audit.h> @@ -582,6 +583,30 @@ static int proc_pid_syscall(struct task_struct *task, char *buffer) } #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ +/* + * Print out the current seccomp filter set for the task. + */ +#ifdef CONFIG_SECCOMP_FILTER +int proc_pid_seccomp_filter_show(struct seq_file *m, struct pid_namespace *ns, + struct pid *pid, struct task_struct *task) +{ + struct seccomp_filters *filters; + + seq_printf(m, "Mode: %d\n", task->seccomp.mode); + /* Avoid allowing other processes to incur too much added contention by + * only acquiring a reference under the task-wide mutex. + */ + if (mutex_lock_killable(&task->seccomp.filters_guard)) + return -1; + filters = get_seccomp_filters(task->seccomp.filters); + mutex_unlock(&task->seccomp.filters_guard); + + seccomp_show_filters(filters, m); + put_seccomp_filters(filters); + return 0; +} +#endif /* CONFIG_SECCOMP_FILTER */ + /************************************************************************/ /* Here the fs part begins */ /************************************************************************/ @@ -2785,6 +2810,9 @@ static const struct pid_entry tgid_base_stuff[] = { #ifdef CONFIG_HAVE_ARCH_TRACEHOOK INF("syscall", S_IRUGO, proc_pid_syscall), #endif +#ifdef CONFIG_SECCOMP_FILTER + ONE("seccomp_filter", S_IRUGO, proc_pid_seccomp_filter_show), +#endif INF("cmdline", S_IRUGO, proc_pid_cmdline), ONE("stat", S_IRUGO, proc_tgid_stat), ONE("statm", S_IRUGO, proc_pid_statm), @@ -3131,6 +3159,9 @@ static const struct pid_entry tid_base_stuff[] = { #ifdef CONFIG_HAVE_ARCH_TRACEHOOK INF("syscall", S_IRUGO, proc_pid_syscall), #endif +#ifdef CONFIG_SECCOMP_FILTER + ONE("seccomp_filter", S_IRUGO, proc_pid_seccomp_filter_show), +#endif INF("cmdline", S_IRUGO, proc_pid_cmdline), ONE("stat", S_IRUGO, proc_tid_stat), ONE("statm", S_IRUGO, proc_pid_statm), -- 1.7.0.4
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