From 77b4b5420422fc037d00b8f3f0e89b2262e4ae29 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Thu, 5 Sep 2019 23:15:08 +0200 Subject: [PATCH] posix-cpu-timers: Fix permission check regression The recent consolidation of the three permission checks introduced a subtle regression. For timer_create() with a process wide timer it returns the current task if the lookup through the PID which is encoded into the clockid results in returning current. That's broken because it does not validate whether the current task is the group leader. That was caused by the two different variants of permission checks: - posix_cpu_timer_get() allowed access to the process wide clock when the looked up task is current. That's not an issue because the process wide clock is in the shared sighand. - posix_cpu_timer_create() made sure that the looked up task is the group leader. Restore the previous state. Note, that these permission checks are more than questionable, but that's subject to follow up changes. Fixes: 6ae40e3fdcd3 ("posix-cpu-timers: Provide task validation functions") Signed-off-by: Thomas Gleixner Reviewed-by: Frederic Weisbecker Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1909052314110.1902@nanos.tec.linutronix.de --- kernel/time/posix-cpu-timers.c | 44 +++++++++++++++++++++++++++------- 1 file changed, 35 insertions(+), 9 deletions(-) diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c index c3a95b122209..92a431981b1c 100644 --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -47,25 +47,46 @@ void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new) /* * Functions for validating access to tasks. */ -static struct task_struct *lookup_task(const pid_t pid, bool thread) +static struct task_struct *lookup_task(const pid_t pid, bool thread, + bool gettime) { struct task_struct *p; + /* + * If the encoded PID is 0, then the timer is targeted at current + * or the process to which current belongs. + */ if (!pid) return thread ? current : current->group_leader; p = find_task_by_vpid(pid); - if (!p || p == current) + if (!p) return p; + if (thread) return same_thread_group(p, current) ? p : NULL; - if (p == current) - return p; + + if (gettime) { + /* + * For clock_gettime(PROCESS) the task does not need to be + * the actual group leader. tsk->sighand gives + * access to the group's clock. + * + * Timers need the group leader because they take a + * reference on it and store the task pointer until the + * timer is destroyed. + */ + return (p == current || thread_group_leader(p)) ? p : NULL; + } + + /* + * For processes require that p is group leader. + */ return has_group_leader_pid(p) ? p : NULL; } static struct task_struct *__get_task_for_clock(const clockid_t clock, - bool getref) + bool getref, bool gettime) { const bool thread = !!CPUCLOCK_PERTHREAD(clock); const pid_t pid = CPUCLOCK_PID(clock); @@ -75,7 +96,7 @@ static struct task_struct *__get_task_for_clock(const clockid_t clock, return NULL; rcu_read_lock(); - p = lookup_task(pid, thread); + p = lookup_task(pid, thread, gettime); if (p && getref) get_task_struct(p); rcu_read_unlock(); @@ -84,12 +105,17 @@ static struct task_struct *__get_task_for_clock(const clockid_t clock, static inline struct task_struct *get_task_for_clock(const clockid_t clock) { - return __get_task_for_clock(clock, true); + return __get_task_for_clock(clock, true, false); +} + +static inline struct task_struct *get_task_for_clock_get(const clockid_t clock) +{ + return __get_task_for_clock(clock, true, true); } static inline int validate_clock_permissions(const clockid_t clock) { - return __get_task_for_clock(clock, false) ? 0 : -EINVAL; + return __get_task_for_clock(clock, false, false) ? 0 : -EINVAL; } /* @@ -339,7 +365,7 @@ static int posix_cpu_clock_get(const clockid_t clock, struct timespec64 *tp) struct task_struct *tsk; u64 t; - tsk = get_task_for_clock(clock); + tsk = get_task_for_clock_get(clock); if (!tsk) return -EINVAL;