From d8e45f2929b94099913eb66c3ebb18b5063e9421 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Wed, 6 Mar 2024 15:51:36 -0800 Subject: overflow: Change DEFINE_FLEX to take __counted_by member The norm should be flexible array structures with __counted_by annotations, so DEFINE_FLEX() is updated to expect that. Rename the non-annotated version to DEFINE_RAW_FLEX(), and update the few existing users. Additionally add selftests for the macros. Reviewed-by: Gustavo A. R. Silva Link: https://lore.kernel.org/r/20240306235128.it.933-kees@kernel.org Reviewed-by: Przemek Kitszel Signed-off-by: Kees Cook --- drivers/net/ethernet/intel/ice/ice_base.c | 4 ++-- drivers/net/ethernet/intel/ice/ice_common.c | 4 ++-- drivers/net/ethernet/intel/ice/ice_ddp.c | 8 ++++---- drivers/net/ethernet/intel/ice/ice_lag.c | 6 +++--- drivers/net/ethernet/intel/ice/ice_sched.c | 4 ++-- drivers/net/ethernet/intel/ice/ice_switch.c | 10 +++++----- include/linux/overflow.h | 25 +++++++++++++++++++++---- lib/overflow_kunit.c | 19 +++++++++++++++++++ 8 files changed, 58 insertions(+), 22 deletions(-) diff --git a/drivers/net/ethernet/intel/ice/ice_base.c b/drivers/net/ethernet/intel/ice/ice_base.c index d2fd315556a3..a545a7917e4f 100644 --- a/drivers/net/ethernet/intel/ice/ice_base.c +++ b/drivers/net/ethernet/intel/ice/ice_base.c @@ -956,7 +956,7 @@ ice_vsi_cfg_txq(struct ice_vsi *vsi, struct ice_tx_ring *ring, int ice_vsi_cfg_single_txq(struct ice_vsi *vsi, struct ice_tx_ring **tx_rings, u16 q_idx) { - DEFINE_FLEX(struct ice_aqc_add_tx_qgrp, qg_buf, txqs, 1); + DEFINE_RAW_FLEX(struct ice_aqc_add_tx_qgrp, qg_buf, txqs, 1); if (q_idx >= vsi->alloc_txq || !tx_rings || !tx_rings[q_idx]) return -EINVAL; @@ -978,7 +978,7 @@ int ice_vsi_cfg_single_txq(struct ice_vsi *vsi, struct ice_tx_ring **tx_rings, static int ice_vsi_cfg_txqs(struct ice_vsi *vsi, struct ice_tx_ring **rings, u16 count) { - DEFINE_FLEX(struct ice_aqc_add_tx_qgrp, qg_buf, txqs, 1); + DEFINE_RAW_FLEX(struct ice_aqc_add_tx_qgrp, qg_buf, txqs, 1); int err = 0; u16 q_idx; diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c index 4d8111aeb0ff..db4b2844e1f7 100644 --- a/drivers/net/ethernet/intel/ice/ice_common.c +++ b/drivers/net/ethernet/intel/ice/ice_common.c @@ -4695,7 +4695,7 @@ ice_dis_vsi_txq(struct ice_port_info *pi, u16 vsi_handle, u8 tc, u8 num_queues, enum ice_disq_rst_src rst_src, u16 vmvf_num, struct ice_sq_cd *cd) { - DEFINE_FLEX(struct ice_aqc_dis_txq_item, qg_list, q_id, 1); + DEFINE_RAW_FLEX(struct ice_aqc_dis_txq_item, qg_list, q_id, 1); u16 i, buf_size = __struct_size(qg_list); struct ice_q_ctx *q_ctx; int status = -ENOENT; @@ -4917,7 +4917,7 @@ int ice_dis_vsi_rdma_qset(struct ice_port_info *pi, u16 count, u32 *qset_teid, u16 *q_id) { - DEFINE_FLEX(struct ice_aqc_dis_txq_item, qg_list, q_id, 1); + DEFINE_RAW_FLEX(struct ice_aqc_dis_txq_item, qg_list, q_id, 1); u16 qg_size = __struct_size(qg_list); struct ice_hw *hw; int status = 0; diff --git a/drivers/net/ethernet/intel/ice/ice_ddp.c b/drivers/net/ethernet/intel/ice/ice_ddp.c index 7532d11ad7f3..fc91c4d41186 100644 --- a/drivers/net/ethernet/intel/ice/ice_ddp.c +++ b/drivers/net/ethernet/intel/ice/ice_ddp.c @@ -1938,8 +1938,8 @@ static enum ice_ddp_state ice_init_pkg_info(struct ice_hw *hw, */ static enum ice_ddp_state ice_get_pkg_info(struct ice_hw *hw) { - DEFINE_FLEX(struct ice_aqc_get_pkg_info_resp, pkg_info, pkg_info, - ICE_PKG_CNT); + DEFINE_RAW_FLEX(struct ice_aqc_get_pkg_info_resp, pkg_info, pkg_info, + ICE_PKG_CNT); u16 size = __struct_size(pkg_info); u32 i; @@ -1990,8 +1990,8 @@ static enum ice_ddp_state ice_chk_pkg_compat(struct ice_hw *hw, struct ice_pkg_hdr *ospkg, struct ice_seg **seg) { - DEFINE_FLEX(struct ice_aqc_get_pkg_info_resp, pkg, pkg_info, - ICE_PKG_CNT); + DEFINE_RAW_FLEX(struct ice_aqc_get_pkg_info_resp, pkg, pkg_info, + ICE_PKG_CNT); u16 size = __struct_size(pkg); enum ice_ddp_state state; u32 i; diff --git a/drivers/net/ethernet/intel/ice/ice_lag.c b/drivers/net/ethernet/intel/ice/ice_lag.c index 467372d541d2..f97128b69f87 100644 --- a/drivers/net/ethernet/intel/ice/ice_lag.c +++ b/drivers/net/ethernet/intel/ice/ice_lag.c @@ -491,7 +491,7 @@ static void ice_lag_move_vf_node_tc(struct ice_lag *lag, u8 oldport, u8 newport, u16 vsi_num, u8 tc) { - DEFINE_FLEX(struct ice_aqc_move_elem, buf, teid, 1); + DEFINE_RAW_FLEX(struct ice_aqc_move_elem, buf, teid, 1); struct device *dev = ice_pf_to_dev(lag->pf); u16 numq, valq, num_moved, qbuf_size; u16 buf_size = __struct_size(buf); @@ -849,7 +849,7 @@ static void ice_lag_reclaim_vf_tc(struct ice_lag *lag, struct ice_hw *src_hw, u16 vsi_num, u8 tc) { - DEFINE_FLEX(struct ice_aqc_move_elem, buf, teid, 1); + DEFINE_RAW_FLEX(struct ice_aqc_move_elem, buf, teid, 1); struct device *dev = ice_pf_to_dev(lag->pf); u16 numq, valq, num_moved, qbuf_size; u16 buf_size = __struct_size(buf); @@ -1873,7 +1873,7 @@ static void ice_lag_move_vf_nodes_tc_sync(struct ice_lag *lag, struct ice_hw *dest_hw, u16 vsi_num, u8 tc) { - DEFINE_FLEX(struct ice_aqc_move_elem, buf, teid, 1); + DEFINE_RAW_FLEX(struct ice_aqc_move_elem, buf, teid, 1); struct device *dev = ice_pf_to_dev(lag->pf); u16 numq, valq, num_moved, qbuf_size; u16 buf_size = __struct_size(buf); diff --git a/drivers/net/ethernet/intel/ice/ice_sched.c b/drivers/net/ethernet/intel/ice/ice_sched.c index d174a4eeb899..a1525992d14b 100644 --- a/drivers/net/ethernet/intel/ice/ice_sched.c +++ b/drivers/net/ethernet/intel/ice/ice_sched.c @@ -237,7 +237,7 @@ static int ice_sched_remove_elems(struct ice_hw *hw, struct ice_sched_node *parent, u32 node_teid) { - DEFINE_FLEX(struct ice_aqc_delete_elem, buf, teid, 1); + DEFINE_RAW_FLEX(struct ice_aqc_delete_elem, buf, teid, 1); u16 buf_size = __struct_size(buf); u16 num_groups_removed = 0; int status; @@ -2219,7 +2219,7 @@ int ice_sched_move_nodes(struct ice_port_info *pi, struct ice_sched_node *parent, u16 num_items, u32 *list) { - DEFINE_FLEX(struct ice_aqc_move_elem, buf, teid, 1); + DEFINE_RAW_FLEX(struct ice_aqc_move_elem, buf, teid, 1); u16 buf_len = __struct_size(buf); struct ice_sched_node *node; u16 i, grps_movd = 0; diff --git a/drivers/net/ethernet/intel/ice/ice_switch.c b/drivers/net/ethernet/intel/ice/ice_switch.c index f84bab80ca42..d4baae8c3b72 100644 --- a/drivers/net/ethernet/intel/ice/ice_switch.c +++ b/drivers/net/ethernet/intel/ice/ice_switch.c @@ -1812,7 +1812,7 @@ ice_aq_alloc_free_vsi_list(struct ice_hw *hw, u16 *vsi_list_id, enum ice_sw_lkup_type lkup_type, enum ice_adminq_opc opc) { - DEFINE_FLEX(struct ice_aqc_alloc_free_res_elem, sw_buf, elem, 1); + DEFINE_RAW_FLEX(struct ice_aqc_alloc_free_res_elem, sw_buf, elem, 1); u16 buf_len = __struct_size(sw_buf); struct ice_aqc_res_elem *vsi_ele; int status; @@ -2081,7 +2081,7 @@ ice_aq_get_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u8 *r_bitmap, */ int ice_alloc_recipe(struct ice_hw *hw, u16 *rid) { - DEFINE_FLEX(struct ice_aqc_alloc_free_res_elem, sw_buf, elem, 1); + DEFINE_RAW_FLEX(struct ice_aqc_alloc_free_res_elem, sw_buf, elem, 1); u16 buf_len = __struct_size(sw_buf); int status; @@ -4418,7 +4418,7 @@ int ice_alloc_res_cntr(struct ice_hw *hw, u8 type, u8 alloc_shared, u16 num_items, u16 *counter_id) { - DEFINE_FLEX(struct ice_aqc_alloc_free_res_elem, buf, elem, 1); + DEFINE_RAW_FLEX(struct ice_aqc_alloc_free_res_elem, buf, elem, 1); u16 buf_len = __struct_size(buf); int status; @@ -4446,7 +4446,7 @@ int ice_free_res_cntr(struct ice_hw *hw, u8 type, u8 alloc_shared, u16 num_items, u16 counter_id) { - DEFINE_FLEX(struct ice_aqc_alloc_free_res_elem, buf, elem, 1); + DEFINE_RAW_FLEX(struct ice_aqc_alloc_free_res_elem, buf, elem, 1); u16 buf_len = __struct_size(buf); int status; @@ -4476,7 +4476,7 @@ ice_free_res_cntr(struct ice_hw *hw, u8 type, u8 alloc_shared, u16 num_items, */ int ice_share_res(struct ice_hw *hw, u16 type, u8 shared, u16 res_id) { - DEFINE_FLEX(struct ice_aqc_alloc_free_res_elem, buf, elem, 1); + DEFINE_RAW_FLEX(struct ice_aqc_alloc_free_res_elem, buf, elem, 1); u16 buf_len = __struct_size(buf); u16 res_type; int status; diff --git a/include/linux/overflow.h b/include/linux/overflow.h index aa691f2119b0..0c7e3dcfe867 100644 --- a/include/linux/overflow.h +++ b/include/linux/overflow.h @@ -398,7 +398,7 @@ static inline size_t __must_check size_sub(size_t minuend, size_t subtrahend) * @count: Number of elements in the array; must be compile-time const. * @initializer: initializer expression (could be empty for no init). */ -#define _DEFINE_FLEX(type, name, member, count, initializer) \ +#define _DEFINE_FLEX(type, name, member, count, initializer...) \ _Static_assert(__builtin_constant_p(count), \ "onstack flex array members require compile-time const count"); \ union { \ @@ -408,8 +408,8 @@ static inline size_t __must_check size_sub(size_t minuend, size_t subtrahend) type *name = (type *)&name##_u /** - * DEFINE_FLEX() - Define an on-stack instance of structure with a trailing - * flexible array member. + * DEFINE_RAW_FLEX() - Define an on-stack instance of structure with a trailing + * flexible array member, when it does not have a __counted_by annotation. * * @type: structure type name, including "struct" keyword. * @name: Name for a variable to define. @@ -420,7 +420,24 @@ static inline size_t __must_check size_sub(size_t minuend, size_t subtrahend) * flexible array member. * Use __struct_size(@name) to get compile-time size of it afterwards. */ -#define DEFINE_FLEX(type, name, member, count) \ +#define DEFINE_RAW_FLEX(type, name, member, count) \ _DEFINE_FLEX(type, name, member, count, = {}) +/** + * DEFINE_FLEX() - Define an on-stack instance of structure with a trailing + * flexible array member. + * + * @TYPE: structure type name, including "struct" keyword. + * @NAME: Name for a variable to define. + * @MEMBER: Name of the array member. + * @COUNTER: Name of the __counted_by member. + * @COUNT: Number of elements in the array; must be compile-time const. + * + * Define a zeroed, on-stack, instance of @TYPE structure with a trailing + * flexible array member. + * Use __struct_size(@NAME) to get compile-time size of it afterwards. + */ +#define DEFINE_FLEX(TYPE, NAME, MEMBER, COUNTER, COUNT) \ + _DEFINE_FLEX(TYPE, NAME, MEMBER, COUNT, = { .obj.COUNTER = COUNT, }) + #endif /* __LINUX_OVERFLOW_H */ diff --git a/lib/overflow_kunit.c b/lib/overflow_kunit.c index 65e8a72a83bf..4ef31b0bb74d 100644 --- a/lib/overflow_kunit.c +++ b/lib/overflow_kunit.c @@ -1172,6 +1172,24 @@ static void castable_to_type_test(struct kunit *test) #undef TEST_CASTABLE_TO_TYPE } +struct foo { + int a; + u32 counter; + s16 array[] __counted_by(counter); +}; + +static void DEFINE_FLEX_test(struct kunit *test) +{ + DEFINE_RAW_FLEX(struct foo, two, array, 2); + DEFINE_FLEX(struct foo, eight, array, counter, 8); + DEFINE_FLEX(struct foo, empty, array, counter, 0); + + KUNIT_EXPECT_EQ(test, __struct_size(two), + sizeof(struct foo) + sizeof(s16) + sizeof(s16)); + KUNIT_EXPECT_EQ(test, __struct_size(eight), 24); + KUNIT_EXPECT_EQ(test, __struct_size(empty), sizeof(struct foo)); +} + static struct kunit_case overflow_test_cases[] = { KUNIT_CASE(u8_u8__u8_overflow_test), KUNIT_CASE(s8_s8__s8_overflow_test), @@ -1194,6 +1212,7 @@ static struct kunit_case overflow_test_cases[] = { KUNIT_CASE(overflows_type_test), KUNIT_CASE(same_type_test), KUNIT_CASE(castable_to_type_test), + KUNIT_CASE(DEFINE_FLEX_test), {} }; -- cgit v1.2.3