1 files changed, 76 insertions, 17 deletions

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 1a43d06eab28..751c150f9e1c 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -111,7 +111,7 @@ const struct bpf_func_proto bpf_map_pop_elem_proto = {
 	.gpl_only	= false,
 	.ret_type	= RET_INTEGER,
 	.arg1_type	= ARG_CONST_MAP_PTR,
-	.arg2_type	= ARG_PTR_TO_MAP_VALUE | MEM_UNINIT,
+	.arg2_type	= ARG_PTR_TO_MAP_VALUE | MEM_UNINIT | MEM_WRITE,
 };
 
 BPF_CALL_2(bpf_map_peek_elem, struct bpf_map *, map, void *, value)
@@ -124,7 +124,7 @@ const struct bpf_func_proto bpf_map_peek_elem_proto = {
 	.gpl_only	= false,
 	.ret_type	= RET_INTEGER,
 	.arg1_type	= ARG_CONST_MAP_PTR,
-	.arg2_type	= ARG_PTR_TO_MAP_VALUE | MEM_UNINIT,
+	.arg2_type	= ARG_PTR_TO_MAP_VALUE | MEM_UNINIT | MEM_WRITE,
 };
 
 BPF_CALL_3(bpf_map_lookup_percpu_elem, struct bpf_map *, map, void *, key, u32, cpu)
@@ -538,7 +538,7 @@ const struct bpf_func_proto bpf_strtol_proto = {
 	.arg1_type	= ARG_PTR_TO_MEM | MEM_RDONLY,
 	.arg2_type	= ARG_CONST_SIZE,
 	.arg3_type	= ARG_ANYTHING,
-	.arg4_type	= ARG_PTR_TO_FIXED_SIZE_MEM | MEM_UNINIT | MEM_ALIGNED,
+	.arg4_type	= ARG_PTR_TO_FIXED_SIZE_MEM | MEM_UNINIT | MEM_WRITE | MEM_ALIGNED,
 	.arg4_size	= sizeof(s64),
 };
 
@@ -566,7 +566,7 @@ const struct bpf_func_proto bpf_strtoul_proto = {
 	.arg1_type	= ARG_PTR_TO_MEM | MEM_RDONLY,
 	.arg2_type	= ARG_CONST_SIZE,
 	.arg3_type	= ARG_ANYTHING,
-	.arg4_type	= ARG_PTR_TO_FIXED_SIZE_MEM | MEM_UNINIT | MEM_ALIGNED,
+	.arg4_type	= ARG_PTR_TO_FIXED_SIZE_MEM | MEM_UNINIT | MEM_WRITE | MEM_ALIGNED,
 	.arg4_size	= sizeof(u64),
 };
 
@@ -1742,7 +1742,7 @@ static const struct bpf_func_proto bpf_dynptr_from_mem_proto = {
 	.arg1_type	= ARG_PTR_TO_UNINIT_MEM,
 	.arg2_type	= ARG_CONST_SIZE_OR_ZERO,
 	.arg3_type	= ARG_ANYTHING,
-	.arg4_type	= ARG_PTR_TO_DYNPTR | DYNPTR_TYPE_LOCAL | MEM_UNINIT,
+	.arg4_type	= ARG_PTR_TO_DYNPTR | DYNPTR_TYPE_LOCAL | MEM_UNINIT | MEM_WRITE,
 };
 
 BPF_CALL_5(bpf_dynptr_read, void *, dst, u32, len, const struct bpf_dynptr_kern *, src,
@@ -2522,6 +2522,25 @@ __bpf_kfunc struct task_struct *bpf_task_from_pid(s32 pid)
 }
 
 /**
+ * bpf_task_from_vpid - Find a struct task_struct from its vpid by looking it up
+ * in the pid namespace of the current task. If a task is returned, it must
+ * either be stored in a map, or released with bpf_task_release().
+ * @vpid: The vpid of the task being looked up.
+ */
+__bpf_kfunc struct task_struct *bpf_task_from_vpid(s32 vpid)
+{
+	struct task_struct *p;
+
+	rcu_read_lock();
+	p = find_task_by_vpid(vpid);
+	if (p)
+		p = bpf_task_acquire(p);
+	rcu_read_unlock();
+
+	return p;
+}
+
+/**
  * bpf_dynptr_slice() - Obtain a read-only pointer to the dynptr data.
  * @p: The dynptr whose data slice to retrieve
  * @offset: Offset into the dynptr
@@ -2851,21 +2870,47 @@ struct bpf_iter_bits {
 	__u64 __opaque[2];
 } __aligned(8);
 
+#define BITS_ITER_NR_WORDS_MAX 511
+
 struct bpf_iter_bits_kern {
 	union {
-		unsigned long *bits;
-		unsigned long bits_copy;
+		__u64 *bits;
+		__u64 bits_copy;
 	};
-	u32 nr_bits;
+	int nr_bits;
 	int bit;
 } __aligned(8);
 
+/* On 64-bit hosts, unsigned long and u64 have the same size, so passing
+ * a u64 pointer and an unsigned long pointer to find_next_bit() will
+ * return the same result, as both point to the same 8-byte area.
+ *
+ * For 32-bit little-endian hosts, using a u64 pointer or unsigned long
+ * pointer also makes no difference. This is because the first iterated
+ * unsigned long is composed of bits 0-31 of the u64 and the second unsigned
+ * long is composed of bits 32-63 of the u64.
+ *
+ * However, for 32-bit big-endian hosts, this is not the case. The first
+ * iterated unsigned long will be bits 32-63 of the u64, so swap these two
+ * ulong values within the u64.
+ */
+static void swap_ulong_in_u64(u64 *bits, unsigned int nr)
+{
+#if (BITS_PER_LONG == 32) && defined(__BIG_ENDIAN)
+	unsigned int i;
+
+	for (i = 0; i < nr; i++)
+		bits[i] = (bits[i] >> 32) | ((u64)(u32)bits[i] << 32);
+#endif
+}
+
 /**
  * bpf_iter_bits_new() - Initialize a new bits iterator for a given memory area
  * @it: The new bpf_iter_bits to be created
  * @unsafe_ptr__ign: A pointer pointing to a memory area to be iterated over
  * @nr_words: The size of the specified memory area, measured in 8-byte units.
- * Due to the limitation of memalloc, it can't be greater than 512.
+ * The maximum value of @nr_words is @BITS_ITER_NR_WORDS_MAX. This limit may be
+ * further reduced by the BPF memory allocator implementation.
  *
  * This function initializes a new bpf_iter_bits structure for iterating over
  * a memory area which is specified by the @unsafe_ptr__ign and @nr_words. It
@@ -2892,6 +2937,8 @@ bpf_iter_bits_new(struct bpf_iter_bits *it, const u64 *unsafe_ptr__ign, u32 nr_w
 
 	if (!unsafe_ptr__ign || !nr_words)
 		return -EINVAL;
+	if (nr_words > BITS_ITER_NR_WORDS_MAX)
+		return -E2BIG;
 
 	/* Optimization for u64 mask */
 	if (nr_bits == 64) {
@@ -2899,10 +2946,15 @@ bpf_iter_bits_new(struct bpf_iter_bits *it, const u64 *unsafe_ptr__ign, u32 nr_w
 		if (err)
 			return -EFAULT;
 
+		swap_ulong_in_u64(&kit->bits_copy, nr_words);
+
 		kit->nr_bits = nr_bits;
 		return 0;
 	}
 
+	if (bpf_mem_alloc_check_size(false, nr_bytes))
+		return -E2BIG;
+
 	/* Fallback to memalloc */
 	kit->bits = bpf_mem_alloc(&bpf_global_ma, nr_bytes);
 	if (!kit->bits)
@@ -2914,6 +2966,8 @@ bpf_iter_bits_new(struct bpf_iter_bits *it, const u64 *unsafe_ptr__ign, u32 nr_w
 		return err;
 	}
 
+	swap_ulong_in_u64(kit->bits, nr_words);
+
 	kit->nr_bits = nr_bits;
 	return 0;
 }
@@ -2930,17 +2984,16 @@ bpf_iter_bits_new(struct bpf_iter_bits *it, const u64 *unsafe_ptr__ign, u32 nr_w
 __bpf_kfunc int *bpf_iter_bits_next(struct bpf_iter_bits *it)
 {
 	struct bpf_iter_bits_kern *kit = (void *)it;
-	u32 nr_bits = kit->nr_bits;
-	const unsigned long *bits;
-	int bit;
+	int bit = kit->bit, nr_bits = kit->nr_bits;
+	const void *bits;
 
-	if (nr_bits == 0)
+	if (!nr_bits || bit >= nr_bits)
 		return NULL;
 
 	bits = nr_bits == 64 ? &kit->bits_copy : kit->bits;
-	bit = find_next_bit(bits, nr_bits, kit->bit + 1);
+	bit = find_next_bit(bits, nr_bits, bit + 1);
 	if (bit >= nr_bits) {
-		kit->nr_bits = 0;
+		kit->bit = bit;
 		return NULL;
 	}
 
@@ -3034,7 +3087,9 @@ BTF_ID_FLAGS(func, bpf_task_under_cgroup, KF_RCU)
 BTF_ID_FLAGS(func, bpf_task_get_cgroup1, KF_ACQUIRE | KF_RCU | KF_RET_NULL)
 #endif
 BTF_ID_FLAGS(func, bpf_task_from_pid, KF_ACQUIRE | KF_RET_NULL)
+BTF_ID_FLAGS(func, bpf_task_from_vpid, KF_ACQUIRE | KF_RET_NULL)
 BTF_ID_FLAGS(func, bpf_throw)
+BTF_ID_FLAGS(func, bpf_send_signal_task, KF_TRUSTED_ARGS)
 BTF_KFUNCS_END(generic_btf_ids)
 
 static const struct btf_kfunc_id_set generic_kfunc_set = {
@@ -3052,8 +3107,8 @@ BTF_ID(func, bpf_cgroup_release_dtor)
 #endif
 
 BTF_KFUNCS_START(common_btf_ids)
-BTF_ID_FLAGS(func, bpf_cast_to_kern_ctx)
-BTF_ID_FLAGS(func, bpf_rdonly_cast)
+BTF_ID_FLAGS(func, bpf_cast_to_kern_ctx, KF_FASTCALL)
+BTF_ID_FLAGS(func, bpf_rdonly_cast, KF_FASTCALL)
 BTF_ID_FLAGS(func, bpf_rcu_read_lock)
 BTF_ID_FLAGS(func, bpf_rcu_read_unlock)
 BTF_ID_FLAGS(func, bpf_dynptr_slice, KF_RET_NULL)
@@ -3090,6 +3145,10 @@ BTF_ID_FLAGS(func, bpf_iter_bits_new, KF_ITER_NEW)
 BTF_ID_FLAGS(func, bpf_iter_bits_next, KF_ITER_NEXT | KF_RET_NULL)
 BTF_ID_FLAGS(func, bpf_iter_bits_destroy, KF_ITER_DESTROY)
 BTF_ID_FLAGS(func, bpf_copy_from_user_str, KF_SLEEPABLE)
+BTF_ID_FLAGS(func, bpf_get_kmem_cache)
+BTF_ID_FLAGS(func, bpf_iter_kmem_cache_new, KF_ITER_NEW | KF_SLEEPABLE)
+BTF_ID_FLAGS(func, bpf_iter_kmem_cache_next, KF_ITER_NEXT | KF_RET_NULL | KF_SLEEPABLE)
+BTF_ID_FLAGS(func, bpf_iter_kmem_cache_destroy, KF_ITER_DESTROY | KF_SLEEPABLE)
 BTF_KFUNCS_END(common_btf_ids)
 
 static const struct btf_kfunc_id_set common_kfunc_set = {