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[87.115.72.95]) by smtp.gmail.com with ESMTPSA id f9-20020a05620a280900b006fcaa1eab0esm22823407qkp.123.2023.01.18.08.18.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Jan 2023 08:18:22 -0800 (PST) From: Andrew Burgess To: gdb-patches@sourceware.org Cc: Andrew Burgess Subject: [PATCHv2 04/13] gdbserver: allows agent_mem_read to return an error code Date: Wed, 18 Jan 2023 16:18:00 +0000 Message-Id: <38df45adb7bfb18c47724d63f67bd35b5cd0923c.1674058360.git.aburgess@redhat.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: References: MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII"; x-default=true X-Spam-Status: No, score=-11.8 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Currently the gdbserver function agent_mem_read ignores any errors from calling read_inferior_memory. This means that if there is an attempt to access invalid memory then this will appear to succeed. In this I update agent_mem_read so that if read_inferior_memory fails, agent_mem_read will return an error code. However, non of the callers of agent_mem_read actually check the return value, so this commit will have no effect on anything. In the next commit I will update the users of agent_mem_read to check for the error code. I've also updated the header comments on agent_mem_read to better reflect what the function does, and its possible return values. --- gdbserver/tracepoint.cc | 11 ++++------- gdbserver/tracepoint.h | 9 +++++++-- 2 files changed, 11 insertions(+), 9 deletions(-) diff --git a/gdbserver/tracepoint.cc b/gdbserver/tracepoint.cc index 37a9a8c5b7c..60918fc0678 100644 --- a/gdbserver/tracepoint.cc +++ b/gdbserver/tracepoint.cc @@ -4914,8 +4914,7 @@ condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, return (value ? 1 : 0); } -/* Do memory copies for bytecodes. */ -/* Do the recording of memory blocks for actions and bytecodes. */ +/* See tracepoint.h. */ int agent_mem_read (struct eval_agent_expr_context *ctx, @@ -4927,10 +4926,7 @@ agent_mem_read (struct eval_agent_expr_context *ctx, /* If a 'to' buffer is specified, use it. */ if (to != NULL) - { - read_inferior_memory (from, to, len); - return 0; - } + return read_inferior_memory (from, to, len); /* Otherwise, create a new memory block in the trace buffer. */ while (remaining > 0) @@ -4951,7 +4947,8 @@ agent_mem_read (struct eval_agent_expr_context *ctx, memcpy (mspace, &blocklen, sizeof (blocklen)); mspace += sizeof (blocklen); /* Record the memory block proper. */ - read_inferior_memory (from, mspace, blocklen); + if (read_inferior_memory (from, mspace, blocklen) != 0) + return 1; trace_debug ("%d bytes recorded", blocklen); remaining -= blocklen; from += blocklen; diff --git a/gdbserver/tracepoint.h b/gdbserver/tracepoint.h index a30f540d130..e424dc9dfb8 100644 --- a/gdbserver/tracepoint.h +++ b/gdbserver/tracepoint.h @@ -161,8 +161,13 @@ void gdb_agent_about_to_close (int pid); struct traceframe; struct eval_agent_expr_context; -/* Do memory copies for bytecodes. */ -/* Do the recording of memory blocks for actions and bytecodes. */ +/* When TO is not NULL, do memory copies for bytecodes, read LEN bytes + starting at address FROM, and place the result in the buffer TO. + Return 0 on success, otherwise a non-zero error code. + + When TO is NULL, do the recording of memory blocks for actions and + bytecodes into a new traceframe block. Return 0 on success, otherwise, + return 1 if there is an error. */ int agent_mem_read (struct eval_agent_expr_context *ctx, unsigned char *to, CORE_ADDR from, -- 2.25.4