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| author | Djalal Harouni <tixxdz@opendz.org> | 2014-04-08 00:38:36 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-08 01:36:04 +0200 |
| commit | 35a35046e4f9d8849e727b0e0f6edac0ece4ca6e (patch) | |
| tree | 40e3296460ebc388f4c1ce3f622c0858fae0a6e9 /fs/proc | |
| parent | fs/proc/inode.c: use RCU_INIT_POINTER(x, NULL) (diff) | |
| download | linux-35a35046e4f9d8849e727b0e0f6edac0ece4ca6e.tar.xz linux-35a35046e4f9d8849e727b0e0f6edac0ece4ca6e.zip | |
procfs: make /proc/*/{stack,syscall,personality} 0400
These procfs files contain sensitive information and currently their
mode is 0444. Change this to 0400, so the VFS will be able to block
unprivileged processes from getting file descriptors on arbitrary
privileged /proc/*/{stack,syscall,personality} files.
This reduces the scope of ASLR leaking and bypasses by protecting already
running processes.
Signed-off-by: Djalal Harouni <tixxdz@opendz.org>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Andy Lutomirski <luto@amacapital.net>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc')
| -rw-r--r-- | fs/proc/base.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index b9760628e1fd..a08c92289357 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2588,7 +2588,7 @@ static const struct pid_entry tgid_base_stuff[] = { REG("environ", S_IRUSR, proc_environ_operations), INF("auxv", S_IRUSR, proc_pid_auxv), ONE("status", S_IRUGO, proc_pid_status), - ONE("personality", S_IRUGO, proc_pid_personality), + ONE("personality", S_IRUSR, proc_pid_personality), INF("limits", S_IRUGO, proc_pid_limits), #ifdef CONFIG_SCHED_DEBUG REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), @@ -2598,7 +2598,7 @@ static const struct pid_entry tgid_base_stuff[] = { #endif REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), #ifdef CONFIG_HAVE_ARCH_TRACEHOOK - INF("syscall", S_IRUGO, proc_pid_syscall), + INF("syscall", S_IRUSR, proc_pid_syscall), #endif INF("cmdline", S_IRUGO, proc_pid_cmdline), ONE("stat", S_IRUGO, proc_tgid_stat), @@ -2626,7 +2626,7 @@ static const struct pid_entry tgid_base_stuff[] = { INF("wchan", S_IRUGO, proc_pid_wchan), #endif #ifdef CONFIG_STACKTRACE - ONE("stack", S_IRUGO, proc_pid_stack), + ONE("stack", S_IRUSR, proc_pid_stack), #endif #ifdef CONFIG_SCHEDSTATS INF("schedstat", S_IRUGO, proc_pid_schedstat), @@ -2927,14 +2927,14 @@ static const struct pid_entry tid_base_stuff[] = { REG("environ", S_IRUSR, proc_environ_operations), INF("auxv", S_IRUSR, proc_pid_auxv), ONE("status", S_IRUGO, proc_pid_status), - ONE("personality", S_IRUGO, proc_pid_personality), + ONE("personality", S_IRUSR, proc_pid_personality), INF("limits", S_IRUGO, proc_pid_limits), #ifdef CONFIG_SCHED_DEBUG REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), #endif REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), #ifdef CONFIG_HAVE_ARCH_TRACEHOOK - INF("syscall", S_IRUGO, proc_pid_syscall), + INF("syscall", S_IRUSR, proc_pid_syscall), #endif INF("cmdline", S_IRUGO, proc_pid_cmdline), ONE("stat", S_IRUGO, proc_tid_stat), @@ -2964,7 +2964,7 @@ static const struct pid_entry tid_base_stuff[] = { INF("wchan", S_IRUGO, proc_pid_wchan), #endif #ifdef CONFIG_STACKTRACE - ONE("stack", S_IRUGO, proc_pid_stack), + ONE("stack", S_IRUSR, proc_pid_stack), #endif #ifdef CONFIG_SCHEDSTATS INF("schedstat", S_IRUGO, proc_pid_schedstat), |