From be64c77d0411e103158bc798f8f1683e6f279619 Mon Sep 17 00:00:00 2001 From: Vasiliy Kulikov Date: Tue, 26 Jul 2011 16:08:38 -0700 Subject: proc: fix a race in do_io_accounting() commit 293eb1e7772b25a93647c798c7b89bf26c2da2e0 upstream. If an inode's mode permits opening /proc/PID/io and the resulting file descriptor is kept across execve() of a setuid or similar binary, the ptrace_may_access() check tries to prevent using this fd against the task with escalated privileges. Unfortunately, there is a race in the check against execve(). If execve() is processed after the ptrace check, but before the actual io information gathering, io statistics will be gathered from the privileged process. At least in theory this might lead to gathering sensible information (like ssh/ftp password length) that wouldn't be available otherwise. Holding task->signal->cred_guard_mutex while gathering the io information should protect against the race. The order of locking is similar to the one inside of ptrace_attach(): first goes cred_guard_mutex, then lock_task_sighand(). Signed-off-by: Vasiliy Kulikov Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman Change-Id: I8ec024ff4c9f8d72a6883411920331bd1d512731 Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/35659 Tested-by: Per VAHLNE Reviewed-by: Jonas ABERG --- fs/proc/base.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/fs/proc/base.c b/fs/proc/base.c index cc9c0c3bf6f..efb304854b7 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2747,9 +2747,16 @@ static int do_io_accounting(struct task_struct *task, char *buffer, int whole) { struct task_io_accounting acct = task->ioac; unsigned long flags; + int result; - if (!ptrace_may_access(task, PTRACE_MODE_READ)) - return -EACCES; + result = mutex_lock_killable(&task->signal->cred_guard_mutex); + if (result) + return result; + + if (!ptrace_may_access(task, PTRACE_MODE_READ)) { + result = -EACCES; + goto out_unlock; + } if (whole && lock_task_sighand(task, &flags)) { struct task_struct *t = task; @@ -2760,7 +2767,7 @@ static int do_io_accounting(struct task_struct *task, char *buffer, int whole) unlock_task_sighand(task, &flags); } - return sprintf(buffer, + result = sprintf(buffer, "rchar: %llu\n" "wchar: %llu\n" "syscr: %llu\n" @@ -2775,6 +2782,9 @@ static int do_io_accounting(struct task_struct *task, char *buffer, int whole) (unsigned long long)acct.read_bytes, (unsigned long long)acct.write_bytes, (unsigned long long)acct.cancelled_write_bytes); +out_unlock: + mutex_unlock(&task->signal->cred_guard_mutex); + return result; } static int proc_tid_io_accounting(struct task_struct *task, char *buffer) -- cgit v1.2.3