From patchwork Mon Apr 8 07:41:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 13620653 X-Patchwork-Delegate: kuba@kernel.org Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 04DD436AFB; Mon, 8 Apr 2024 07:41:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712562111; cv=none; b=bSV0WIrjf3qSAmkGtdL2h/rQ9Ap2D1JZo8rxxlgWB9wOV9JDGiJoRDl9SXM14PVWFohocvibSuRGK1MzCfzAS2rSvPHjszQldQ3CF0IVVUfi2MOxw/o5/BsRA0JRKNyeZ3fyrQ7+343DpRE4q6bGAVnPqqYKdo6AsVBNAaUYGWY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712562111; c=relaxed/simple; bh=QNi6U869pwkO7r45qhNkBeq35HwP1JQ6HFNif1rR0mU=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=egdctqY1j28vqe5SQSCen+2kVqp9kjkw+b1eyfgFRoKhZVgwmqhGhYXF7DdScxNFrmB5U8kyHJJ4DhnDL+JzuLUR1YlAvcWrVi+2yoJaz/DVO+2O8UM/W290PugvjOfrMHWhw7je2RaSoEJr6IdaTiZX+9yckIDMpzOX8LDTH+E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YCeTtHUh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="YCeTtHUh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4A58AC433C7; Mon, 8 Apr 2024 07:41:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1712562110; bh=QNi6U869pwkO7r45qhNkBeq35HwP1JQ6HFNif1rR0mU=; h=From:To:Cc:Subject:Date:From; b=YCeTtHUhbFPR8AWyn0J2QajgebKiCMz0YpUDJRF3+azZXKDimucPthFuIQOUtccoA L7QCSNteu+24n3M9muxnJUJa5dD3J6A8A1O5AHToGlxwvegbK8onu06+//l7XiuJB+ XVKw0N56i5HS7w2VN/X5967JUOmTBcRyzJNicQgxhTy8pKL55orn3K/ri07M+7PCzO qLg+cmmmvDoqSoNU1npRqPEHoCrRFKm6SQMVkJF7drxPl8yyyoNd1eoPq3KseBFq5Q 7C5YYDpZ4jQw+Ccx1tLyii1xTwFjB9083VKg9H7H42FFEFvXxW2r2ocFyTjkcMd6ac gZA9e/UpwkWLQ== From: Arnd Bergmann To: Saeed Mahameed , Leon Romanovsky , Tariq Toukan Cc: Arnd Bergmann , Simon Horman , Jiri Pirko , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Yevgeny Kliteynik , Alex Vesker , Jiri Pirko , netdev@vger.kernel.org, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] [v4] net/mlx5: fix possible stack overflows Date: Mon, 8 Apr 2024 09:41:10 +0200 Message-Id: <20240408074142.3007036-1-arnd@kernel.org> X-Mailer: git-send-email 2.39.2 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org From: Arnd Bergmann A couple of debug functions use a 512 byte temporary buffer and call another function that has another buffer of the same size, which in turn exceeds the usual warning limit for excessive stack usage: drivers/net/ethernet/mellanox/mlx5/core/steering/dr_dbg.c:1073:1: error: stack frame size (1448) exceeds limit (1024) in 'dr_dump_start' [-Werror,-Wframe-larger-than] dr_dump_start(struct seq_file *file, loff_t *pos) drivers/net/ethernet/mellanox/mlx5/core/steering/dr_dbg.c:1009:1: error: stack frame size (1120) exceeds limit (1024) in 'dr_dump_domain' [-Werror,-Wframe-larger-than] dr_dump_domain(struct seq_file *file, struct mlx5dr_domain *dmn) drivers/net/ethernet/mellanox/mlx5/core/steering/dr_dbg.c:705:1: error: stack frame size (1104) exceeds limit (1024) in 'dr_dump_matcher_rx_tx' [-Werror,-Wframe-larger-than] dr_dump_matcher_rx_tx(struct seq_file *file, bool is_rx, Rework these so that each of the various code paths only ever has one of these buffers in it, and exactly the functions that declare one have the 'noinline_for_stack' annotation that prevents them from all being inlined into the same caller. Fixes: 917d1e799ddf ("net/mlx5: DR, Change SWS usage to debug fs seq_file interface") Reviewed-by: Simon Horman Reviewed-by: Jiri Pirko Link: https://lore.kernel.org/all/20240219100506.648089-1-arnd@kernel.org/ Signed-off-by: Arnd Bergmann Acked-by: Tariq Toukan --- [v4] Resend with Reviewed-by after the merge window closed [v3] no changes, sending again without a second patch [v2] no changes, just based on patch 1/2 but can still be applied independently --- .../mellanox/mlx5/core/steering/dr_dbg.c | 82 +++++++++---------- 1 file changed, 41 insertions(+), 41 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_dbg.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_dbg.c index 64f4cc284aea..030a5776c937 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_dbg.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_dbg.c @@ -205,12 +205,11 @@ dr_dump_hex_print(char hex[DR_HEX_SIZE], char *src, u32 size) } static int -dr_dump_rule_action_mem(struct seq_file *file, const u64 rule_id, +dr_dump_rule_action_mem(struct seq_file *file, char *buff, const u64 rule_id, struct mlx5dr_rule_action_member *action_mem) { struct mlx5dr_action *action = action_mem->action; const u64 action_id = DR_DBG_PTR_TO_ID(action); - char buff[MLX5DR_DEBUG_DUMP_BUFF_LENGTH]; u64 hit_tbl_ptr, miss_tbl_ptr; u32 hit_tbl_id, miss_tbl_id; int ret; @@ -488,10 +487,9 @@ dr_dump_rule_action_mem(struct seq_file *file, const u64 rule_id, } static int -dr_dump_rule_mem(struct seq_file *file, struct mlx5dr_ste *ste, +dr_dump_rule_mem(struct seq_file *file, char *buff, struct mlx5dr_ste *ste, bool is_rx, const u64 rule_id, u8 format_ver) { - char buff[MLX5DR_DEBUG_DUMP_BUFF_LENGTH]; char hw_ste_dump[DR_HEX_SIZE]; u32 mem_rec_type; int ret; @@ -522,7 +520,8 @@ dr_dump_rule_mem(struct seq_file *file, struct mlx5dr_ste *ste, } static int -dr_dump_rule_rx_tx(struct seq_file *file, struct mlx5dr_rule_rx_tx *rule_rx_tx, +dr_dump_rule_rx_tx(struct seq_file *file, char *buff, + struct mlx5dr_rule_rx_tx *rule_rx_tx, bool is_rx, const u64 rule_id, u8 format_ver) { struct mlx5dr_ste *ste_arr[DR_RULE_MAX_STES + DR_ACTION_MAX_STES]; @@ -533,7 +532,7 @@ dr_dump_rule_rx_tx(struct seq_file *file, struct mlx5dr_rule_rx_tx *rule_rx_tx, return 0; while (i--) { - ret = dr_dump_rule_mem(file, ste_arr[i], is_rx, rule_id, + ret = dr_dump_rule_mem(file, buff, ste_arr[i], is_rx, rule_id, format_ver); if (ret < 0) return ret; @@ -542,7 +541,8 @@ dr_dump_rule_rx_tx(struct seq_file *file, struct mlx5dr_rule_rx_tx *rule_rx_tx, return 0; } -static int dr_dump_rule(struct seq_file *file, struct mlx5dr_rule *rule) +static noinline_for_stack int +dr_dump_rule(struct seq_file *file, struct mlx5dr_rule *rule) { struct mlx5dr_rule_action_member *action_mem; const u64 rule_id = DR_DBG_PTR_TO_ID(rule); @@ -565,19 +565,19 @@ static int dr_dump_rule(struct seq_file *file, struct mlx5dr_rule *rule) return ret; if (rx->nic_matcher) { - ret = dr_dump_rule_rx_tx(file, rx, true, rule_id, format_ver); + ret = dr_dump_rule_rx_tx(file, buff, rx, true, rule_id, format_ver); if (ret < 0) return ret; } if (tx->nic_matcher) { - ret = dr_dump_rule_rx_tx(file, tx, false, rule_id, format_ver); + ret = dr_dump_rule_rx_tx(file, buff, tx, false, rule_id, format_ver); if (ret < 0) return ret; } list_for_each_entry(action_mem, &rule->rule_actions_list, list) { - ret = dr_dump_rule_action_mem(file, rule_id, action_mem); + ret = dr_dump_rule_action_mem(file, buff, rule_id, action_mem); if (ret < 0) return ret; } @@ -586,10 +586,10 @@ static int dr_dump_rule(struct seq_file *file, struct mlx5dr_rule *rule) } static int -dr_dump_matcher_mask(struct seq_file *file, struct mlx5dr_match_param *mask, +dr_dump_matcher_mask(struct seq_file *file, char *buff, + struct mlx5dr_match_param *mask, u8 criteria, const u64 matcher_id) { - char buff[MLX5DR_DEBUG_DUMP_BUFF_LENGTH]; char dump[DR_HEX_SIZE]; int ret; @@ -681,10 +681,10 @@ dr_dump_matcher_mask(struct seq_file *file, struct mlx5dr_match_param *mask, } static int -dr_dump_matcher_builder(struct seq_file *file, struct mlx5dr_ste_build *builder, +dr_dump_matcher_builder(struct seq_file *file, char *buff, + struct mlx5dr_ste_build *builder, u32 index, bool is_rx, const u64 matcher_id) { - char buff[MLX5DR_DEBUG_DUMP_BUFF_LENGTH]; int ret; ret = snprintf(buff, MLX5DR_DEBUG_DUMP_BUFF_LENGTH, @@ -702,11 +702,10 @@ dr_dump_matcher_builder(struct seq_file *file, struct mlx5dr_ste_build *builder, } static int -dr_dump_matcher_rx_tx(struct seq_file *file, bool is_rx, +dr_dump_matcher_rx_tx(struct seq_file *file, char *buff, bool is_rx, struct mlx5dr_matcher_rx_tx *matcher_rx_tx, const u64 matcher_id) { - char buff[MLX5DR_DEBUG_DUMP_BUFF_LENGTH]; enum dr_dump_rec_type rec_type; u64 s_icm_addr, e_icm_addr; int i, ret; @@ -731,7 +730,7 @@ dr_dump_matcher_rx_tx(struct seq_file *file, bool is_rx, return ret; for (i = 0; i < matcher_rx_tx->num_of_builders; i++) { - ret = dr_dump_matcher_builder(file, + ret = dr_dump_matcher_builder(file, buff, &matcher_rx_tx->ste_builder[i], i, is_rx, matcher_id); if (ret < 0) @@ -741,7 +740,7 @@ dr_dump_matcher_rx_tx(struct seq_file *file, bool is_rx, return 0; } -static int +static noinline_for_stack int dr_dump_matcher(struct seq_file *file, struct mlx5dr_matcher *matcher) { struct mlx5dr_matcher_rx_tx *rx = &matcher->rx; @@ -763,19 +762,19 @@ dr_dump_matcher(struct seq_file *file, struct mlx5dr_matcher *matcher) if (ret) return ret; - ret = dr_dump_matcher_mask(file, &matcher->mask, + ret = dr_dump_matcher_mask(file, buff, &matcher->mask, matcher->match_criteria, matcher_id); if (ret < 0) return ret; if (rx->nic_tbl) { - ret = dr_dump_matcher_rx_tx(file, true, rx, matcher_id); + ret = dr_dump_matcher_rx_tx(file, buff, true, rx, matcher_id); if (ret < 0) return ret; } if (tx->nic_tbl) { - ret = dr_dump_matcher_rx_tx(file, false, tx, matcher_id); + ret = dr_dump_matcher_rx_tx(file, buff, false, tx, matcher_id); if (ret < 0) return ret; } @@ -803,11 +802,10 @@ dr_dump_matcher_all(struct seq_file *file, struct mlx5dr_matcher *matcher) } static int -dr_dump_table_rx_tx(struct seq_file *file, bool is_rx, +dr_dump_table_rx_tx(struct seq_file *file, char *buff, bool is_rx, struct mlx5dr_table_rx_tx *table_rx_tx, const u64 table_id) { - char buff[MLX5DR_DEBUG_DUMP_BUFF_LENGTH]; enum dr_dump_rec_type rec_type; u64 s_icm_addr; int ret; @@ -829,7 +827,8 @@ dr_dump_table_rx_tx(struct seq_file *file, bool is_rx, return 0; } -static int dr_dump_table(struct seq_file *file, struct mlx5dr_table *table) +static noinline_for_stack int +dr_dump_table(struct seq_file *file, struct mlx5dr_table *table) { struct mlx5dr_table_rx_tx *rx = &table->rx; struct mlx5dr_table_rx_tx *tx = &table->tx; @@ -848,14 +847,14 @@ static int dr_dump_table(struct seq_file *file, struct mlx5dr_table *table) return ret; if (rx->nic_dmn) { - ret = dr_dump_table_rx_tx(file, true, rx, + ret = dr_dump_table_rx_tx(file, buff, true, rx, DR_DBG_PTR_TO_ID(table)); if (ret < 0) return ret; } if (tx->nic_dmn) { - ret = dr_dump_table_rx_tx(file, false, tx, + ret = dr_dump_table_rx_tx(file, buff, false, tx, DR_DBG_PTR_TO_ID(table)); if (ret < 0) return ret; @@ -881,10 +880,10 @@ static int dr_dump_table_all(struct seq_file *file, struct mlx5dr_table *tbl) } static int -dr_dump_send_ring(struct seq_file *file, struct mlx5dr_send_ring *ring, +dr_dump_send_ring(struct seq_file *file, char *buff, + struct mlx5dr_send_ring *ring, const u64 domain_id) { - char buff[MLX5DR_DEBUG_DUMP_BUFF_LENGTH]; int ret; ret = snprintf(buff, MLX5DR_DEBUG_DUMP_BUFF_LENGTH, @@ -902,13 +901,13 @@ dr_dump_send_ring(struct seq_file *file, struct mlx5dr_send_ring *ring, return 0; } -static noinline_for_stack int +static int dr_dump_domain_info_flex_parser(struct seq_file *file, + char *buff, const char *flex_parser_name, const u8 flex_parser_value, const u64 domain_id) { - char buff[MLX5DR_DEBUG_DUMP_BUFF_LENGTH]; int ret; ret = snprintf(buff, MLX5DR_DEBUG_DUMP_BUFF_LENGTH, @@ -925,11 +924,11 @@ dr_dump_domain_info_flex_parser(struct seq_file *file, return 0; } -static noinline_for_stack int -dr_dump_domain_info_caps(struct seq_file *file, struct mlx5dr_cmd_caps *caps, +static int +dr_dump_domain_info_caps(struct seq_file *file, char *buff, + struct mlx5dr_cmd_caps *caps, const u64 domain_id) { - char buff[MLX5DR_DEBUG_DUMP_BUFF_LENGTH]; struct mlx5dr_cmd_vport_cap *vport_caps; unsigned long i, vports_num; int ret; @@ -969,34 +968,35 @@ dr_dump_domain_info_caps(struct seq_file *file, struct mlx5dr_cmd_caps *caps, } static int -dr_dump_domain_info(struct seq_file *file, struct mlx5dr_domain_info *info, +dr_dump_domain_info(struct seq_file *file, char *buff, + struct mlx5dr_domain_info *info, const u64 domain_id) { int ret; - ret = dr_dump_domain_info_caps(file, &info->caps, domain_id); + ret = dr_dump_domain_info_caps(file, buff, &info->caps, domain_id); if (ret < 0) return ret; - ret = dr_dump_domain_info_flex_parser(file, "icmp_dw0", + ret = dr_dump_domain_info_flex_parser(file, buff, "icmp_dw0", info->caps.flex_parser_id_icmp_dw0, domain_id); if (ret < 0) return ret; - ret = dr_dump_domain_info_flex_parser(file, "icmp_dw1", + ret = dr_dump_domain_info_flex_parser(file, buff, "icmp_dw1", info->caps.flex_parser_id_icmp_dw1, domain_id); if (ret < 0) return ret; - ret = dr_dump_domain_info_flex_parser(file, "icmpv6_dw0", + ret = dr_dump_domain_info_flex_parser(file, buff, "icmpv6_dw0", info->caps.flex_parser_id_icmpv6_dw0, domain_id); if (ret < 0) return ret; - ret = dr_dump_domain_info_flex_parser(file, "icmpv6_dw1", + ret = dr_dump_domain_info_flex_parser(file, buff, "icmpv6_dw1", info->caps.flex_parser_id_icmpv6_dw1, domain_id); if (ret < 0) @@ -1032,12 +1032,12 @@ dr_dump_domain(struct seq_file *file, struct mlx5dr_domain *dmn) if (ret) return ret; - ret = dr_dump_domain_info(file, &dmn->info, domain_id); + ret = dr_dump_domain_info(file, buff, &dmn->info, domain_id); if (ret < 0) return ret; if (dmn->info.supp_sw_steering) { - ret = dr_dump_send_ring(file, dmn->send_ring, domain_id); + ret = dr_dump_send_ring(file, buff, dmn->send_ring, domain_id); if (ret < 0) return ret; }