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([2a01:e0a:3cb:7bb0:7528:8f22:ca44:64f]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-39d89389f72sm1464169f8f.42.2025.04.09.05.20.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Apr 2025 05:20:30 -0700 (PDT) From: Jerome Forissier To: u-boot@lists.denx.de Cc: Ilias Apalodimas , Sughosh Ganu , Jerome Forissier , Joe Hershberger , Ramon Fried , Tom Rini , Adriano Cordova , Heinrich Schuchardt , Simon Glass Subject: [PATCH v2 1/2] net-lwip: wget: add LMB and buffer checks Date: Wed, 9 Apr 2025 14:20:05 +0200 Message-ID: <20250409122007.2560668-2-jerome.forissier@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250409122007.2560668-1-jerome.forissier@linaro.org> References: <20250409122007.2560668-1-jerome.forissier@linaro.org> MIME-Version: 1.0 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean Legacy NET wget invokes a store_block() function which performs buffer validation (LMB, address wrapping). Do the same with NET_LWIP. Signed-off-by: Jerome Forissier Suggested-by: Sughosh Ganu --- net/lwip/wget.c | 49 +++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 41 insertions(+), 8 deletions(-) diff --git a/net/lwip/wget.c b/net/lwip/wget.c index 14f27d42998..746c8164d66 100644 --- a/net/lwip/wget.c +++ b/net/lwip/wget.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include "lwip/altcp_tls.h" #include @@ -201,11 +202,44 @@ static int parse_legacy_arg(char *arg, char *nurl, size_t rem) return 0; } +static int store_block(struct wget_ctx *ctx, void *src, u16_t len) +{ + ulong store_addr = ctx->daddr; + uchar *ptr; + + /* Avoid overflow */ + if (wget_info->buffer_size && wget_info->buffer_size < ctx->size + len) + return -1; + + if (CONFIG_IS_ENABLED(LMB) && wget_info->set_bootdev) { + if (store_addr + len < store_addr || + lmb_read_check(store_addr, len)) { + printf("\nwget error: "); + printf("trying to overwrite reserved memory...\n"); + return -1; + } + } + + ptr = map_sysmem(store_addr, len); + memcpy(ptr, src, len); + unmap_sysmem(ptr); + + ctx->daddr += len; + ctx->size += len; + if (ctx->size - ctx->prevsize > PROGRESS_PRINT_STEP_BYTES) { + printf("#"); + ctx->prevsize = ctx->size; + } + + return 0; +} + static err_t httpc_recv_cb(void *arg, struct altcp_pcb *pcb, struct pbuf *pbuf, err_t err) { struct wget_ctx *ctx = arg; struct pbuf *buf; + err_t ret; if (!pbuf) return ERR_BUF; @@ -214,18 +248,17 @@ static err_t httpc_recv_cb(void *arg, struct altcp_pcb *pcb, struct pbuf *pbuf, ctx->start_time = get_timer(0); for (buf = pbuf; buf; buf = buf->next) { - memcpy((void *)ctx->daddr, buf->payload, buf->len); - ctx->daddr += buf->len; - ctx->size += buf->len; - if (ctx->size - ctx->prevsize > PROGRESS_PRINT_STEP_BYTES) { - printf("#"); - ctx->prevsize = ctx->size; + if (store_block(ctx, buf->payload, buf->len) < 0) { + altcp_abort(pcb); + ret = ERR_BUF; + goto out; } } - altcp_recved(pcb, pbuf->tot_len); + ret = ERR_OK; +out: pbuf_free(pbuf); - return ERR_OK; + return ret; } static void httpc_result_cb(void *arg, httpc_result_t httpc_result, From patchwork Wed Apr 9 12:20:06 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jerome Forissier X-Patchwork-Id: 879359 Delivered-To: patch@linaro.org Received: by 2002:a5d:6dae:0:b0:38f:210b:807b with SMTP id u14csp5951566wrs; Wed, 9 Apr 2025 05:20:55 -0700 (PDT) X-Forwarded-Encrypted: i=2; AJvYcCUe0rkLNzkzrRgdkKehkcLLgVB5vOdS4DdKZFDDB4tD1vMOIpTjF1wrTSftL91cvAxMhaIe1Q==@linaro.org X-Google-Smtp-Source: AGHT+IHDy5jZdrnF1n2OTD7AK9LVZkEOLLUb8Q7l8nU6YOBevxEemg0GaouRKqYHDlf2dRpX5Djl X-Received: by 2002:a05:6102:5785:b0:4c1:90ee:f8c1 with SMTP id ada2fe7eead31-4c9c415d384mr1940806137.5.1744201254878; Wed, 09 Apr 2025 05:20:54 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1744201254; cv=none; d=google.com; s=arc-20240605; b=iEIa6zQTDlaU50r6NmvqHHDj+I9OfXdIl/a2bGkG6qHjUJ3WbdVd5JBfaNiSrXktiK CfF881JWIMcGIwpPSglFNfnSlLr1V0dLV3MMsYd5rj2I1FK/Inr6Rw0fnyvqEtJCUdHs Y2MAbieXdIGwG3ycgfINOnH/NjZgu16kyoBXQkJiKaj6GyWVN+0YqsjbUSKb7hbIB/Fr 5ziYh6sQLPpQcXLJxs2aDzQlDJ5QCLKpphMCpfvL4aiH4pY+x9YQXmqzmmCiJ7dP0Ivv 29f7ujMEmLuB1UnaUBWgXHn9CKl32AW4dbvRh0LGfK66FUJbtCKylYaDyCxVKuIanGG4 MRQw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20240605; h=sender:errors-to:list-subscribe:list-help:list-post:list-archive :list-unsubscribe:list-id:precedence:content-transfer-encoding :mime-version:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=gWEisPS6q2fBGe+ElLWhnrxim85hqSZmazy45tx2acE=; fh=M4Tg1OJjiJ3flL+L7m+cQl2itRUVLQIjVp9wYaRncKQ=; b=KJ0a6lRa/pjzh/URs61TkucK9ekwb9xvllth+5HFN+IFg/GQa9RymHbu3KRtgRrtra 67a51MrqHK/e9JeaKOP/+SYAfq0h7MeGhQ8Ncu1L+TPrfHvlu7KIeODJgHedJPMIfuXh lP1tKzYp9a6hUWKpl3opj8kXdjSvzjtY2dZqRf+OKv4qGcStB2geC9cMtQLS4PgA/hxL ck1Y8i10AD1pxN/dKgLXM6WQCx21EAzaH3vUn8v0bQoopS/IUbff/sND9KOTr3G7X0Hh YLF+ri3dgdhWq8Kaf/PREGAT7lQY31Y4d2llkUWatTVo+y2bxUHSRkRqO0tkEHBvweQi VnhQ==; dara=google.com ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=aaMH7ZtC; spf=pass (google.com: domain of u-boot-bounces@lists.denx.de designates 85.214.62.61 as permitted sender) smtp.mailfrom=u-boot-bounces@lists.denx.de; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org; dara=neutral header.i=@linaro.org Return-Path: Received: from phobos.denx.de (phobos.denx.de. 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([2a01:e0a:3cb:7bb0:7528:8f22:ca44:64f]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-39d89389f72sm1464169f8f.42.2025.04.09.05.20.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Apr 2025 05:20:31 -0700 (PDT) From: Jerome Forissier To: u-boot@lists.denx.de Cc: Ilias Apalodimas , Sughosh Ganu , Jerome Forissier , Joe Hershberger , Ramon Fried , Tom Rini Subject: [PATCH v2 2/2] net-lwip: tftp: add LMB and buffer checks Date: Wed, 9 Apr 2025 14:20:06 +0200 Message-ID: <20250409122007.2560668-3-jerome.forissier@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250409122007.2560668-1-jerome.forissier@linaro.org> References: <20250409122007.2560668-1-jerome.forissier@linaro.org> MIME-Version: 1.0 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean Legacy NET tftp invokes a store_block() function which performs buffer validation (LMB, address wrapping). Do the same with NET_LWIP. Signed-off-by: Jerome Forissier Suggested-by: Sughosh Ganu --- net/lwip/tftp.c | 45 ++++++++++++++++++++++++++++++++++----------- 1 file changed, 34 insertions(+), 11 deletions(-) diff --git a/net/lwip/tftp.c b/net/lwip/tftp.c index 123d66b5dba..38aa647df5c 100644 --- a/net/lwip/tftp.c +++ b/net/lwip/tftp.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -31,6 +32,36 @@ struct tftp_ctx { enum done_state done; }; +static int store_block(struct tftp_ctx *ctx, void *src, u16_t len) +{ + ulong store_addr = ctx->daddr; + void *ptr; + + if (CONFIG_IS_ENABLED(LMB)) { + if (store_addr + len < store_addr || + lmb_read_check(store_addr, len)) { + puts("\nTFTP error: "); + puts("trying to overwrite reserved memory...\n"); + return -1; + } + } + + ptr = map_sysmem(store_addr, len); + memcpy(ptr, src, len); + unmap_sysmem(ptr); + + ctx->daddr += len; + ctx->size += len; + ctx->block_count++; + if (ctx->block_count % 10 == 0) { + putc('#'); + if (ctx->block_count % (65 * 10) == 0) + puts("\n\t "); + } + + return 0; +} + static void *tftp_open(const char *fname, const char *mode, u8_t is_write) { return NULL; @@ -71,17 +102,9 @@ static int tftp_write(void *handle, struct pbuf *p) struct tftp_ctx *ctx = handle; struct pbuf *q; - for (q = p; q; q = q->next) { - memcpy((void *)ctx->daddr, q->payload, q->len); - ctx->daddr += q->len; - ctx->size += q->len; - ctx->block_count++; - if (ctx->block_count % 10 == 0) { - putc('#'); - if (ctx->block_count % (65 * 10) == 0) - puts("\n\t "); - } - } + for (q = p; q; q = q->next) + if (store_block(ctx, q->payload, q->len) < 0) + return -1; return 0; }