Commit 50b5e49c authored by Alexander Potapenko's avatar Alexander Potapenko Committed by Andrew Morton

kmsan: handle task creation and exiting

Tell KMSAN that a new task is created, so the tool creates a backing
metadata structure for that task.

Link: https://lkml.kernel.org/r/20220915150417.722975-17-glider@google.comSigned-off-by: default avatarAlexander Potapenko <glider@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Eric Biggers <ebiggers@kernel.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Marco Elver <elver@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 68ef169a
......@@ -15,9 +15,22 @@
struct page;
struct kmem_cache;
struct task_struct;
#ifdef CONFIG_KMSAN
/**
* kmsan_task_create() - Initialize KMSAN state for the task.
* @task: task to initialize.
*/
void kmsan_task_create(struct task_struct *task);
/**
* kmsan_task_exit() - Notify KMSAN that a task has exited.
* @task: task about to finish.
*/
void kmsan_task_exit(struct task_struct *task);
/**
* kmsan_alloc_page() - Notify KMSAN about an alloc_pages() call.
* @page: struct page pointer returned by alloc_pages().
......@@ -139,6 +152,14 @@ void kmsan_iounmap_page_range(unsigned long start, unsigned long end);
#else
static inline void kmsan_task_create(struct task_struct *task)
{
}
static inline void kmsan_task_exit(struct task_struct *task)
{
}
static inline int kmsan_alloc_page(struct page *page, unsigned int order,
gfp_t flags)
{
......
......@@ -60,6 +60,7 @@
#include <linux/writeback.h>
#include <linux/shm.h>
#include <linux/kcov.h>
#include <linux/kmsan.h>
#include <linux/random.h>
#include <linux/rcuwait.h>
#include <linux/compat.h>
......@@ -742,6 +743,7 @@ void __noreturn do_exit(long code)
WARN_ON(tsk->plug);
kcov_task_exit(tsk);
kmsan_task_exit(tsk);
coredump_task_exit(tsk);
ptrace_event(PTRACE_EVENT_EXIT, code);
......
......@@ -37,6 +37,7 @@
#include <linux/fdtable.h>
#include <linux/iocontext.h>
#include <linux/key.h>
#include <linux/kmsan.h>
#include <linux/binfmts.h>
#include <linux/mman.h>
#include <linux/mmu_notifier.h>
......@@ -1023,6 +1024,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
tsk->worker_private = NULL;
kcov_task_init(tsk);
kmsan_task_create(tsk);
kmap_local_fork(tsk);
#ifdef CONFIG_FAULT_INJECTION
......
......@@ -37,6 +37,16 @@ bool kmsan_enabled __read_mostly;
*/
DEFINE_PER_CPU(struct kmsan_ctx, kmsan_percpu_ctx);
void kmsan_internal_task_create(struct task_struct *task)
{
struct kmsan_ctx *ctx = &task->kmsan_ctx;
struct thread_info *info = current_thread_info();
__memset(ctx, 0, sizeof(*ctx));
ctx->allow_reporting = true;
kmsan_internal_unpoison_memory(info, sizeof(*info), false);
}
void kmsan_internal_poison_memory(void *address, size_t size, gfp_t flags,
unsigned int poison_flags)
{
......
......@@ -27,6 +27,23 @@
* skipping effects of functions like memset() inside instrumented code.
*/
void kmsan_task_create(struct task_struct *task)
{
kmsan_enter_runtime();
kmsan_internal_task_create(task);
kmsan_leave_runtime();
}
void kmsan_task_exit(struct task_struct *task)
{
struct kmsan_ctx *ctx = &task->kmsan_ctx;
if (!kmsan_enabled || kmsan_in_runtime())
return;
ctx->allow_reporting = false;
}
void kmsan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags)
{
if (unlikely(object == NULL))
......
......@@ -180,6 +180,8 @@ void kmsan_internal_set_shadow_origin(void *address, size_t size, int b,
u32 origin, bool checked);
depot_stack_handle_t kmsan_internal_chain_origin(depot_stack_handle_t id);
void kmsan_internal_task_create(struct task_struct *task);
bool kmsan_metadata_is_contiguous(void *addr, size_t size);
void kmsan_internal_check_memory(void *addr, size_t size, const void *user_addr,
int reason);
......
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