From 296956befef3711ed458c7cba8041fde0dab9c50 Mon Sep 17 00:00:00 2001 From: Pedro Franco de Carvalho Date: Mon, 6 Aug 2018 16:24:55 -0300 Subject: [PATCH] Allow larger regblock sizes when saving tracefiles The tracefile.c:trace_save function assumes trace_regblock_size won't be larger than the MAX_TRACE_UPLOAD constant, used to size the buffer which holds trace data. This can cause buffer overruns when this is not the case. This patch changes this function so that the larger size is used to size the buffer. gdb/ChangeLog: 2018-08-06 Pedro Franco de Carvalho * tracefile.c: Include common/byte-vector.h. (trace_save): Change type of buf to gdb::byte_vector. Initialize with trace_regblock_size if needed. Update uses of buf. --- gdb/ChangeLog | 6 ++++++ gdb/tracefile.c | 42 +++++++++++++++++++++++------------------- 2 files changed, 29 insertions(+), 19 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index d7bffb2..03badaf 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,5 +1,11 @@ 2018-08-06 Pedro Franco de Carvalho + * tracefile.c: Include common/byte-vector.h. + (trace_save): Change type of buf to gdb::byte_vector. Initialize + with trace_regblock_size if needed. Update uses of buf. + +2018-08-06 Pedro Franco de Carvalho + * tracepoint.h (collection_list) : Change type to std::vector. * tracepoint.c (collection_list::collection_list): Remove diff --git a/gdb/tracefile.c b/gdb/tracefile.c index ecd2f5c..b367f6e 100644 --- a/gdb/tracefile.c +++ b/gdb/tracefile.c @@ -22,6 +22,7 @@ #include "ctf.h" #include "exec.h" #include "regcache.h" +#include "common/byte-vector.h" /* Helper macros. */ @@ -67,7 +68,7 @@ trace_save (const char *filename, struct trace_file_writer *writer, ULONGEST offset = 0; #define MAX_TRACE_UPLOAD 2000 - gdb_byte buf[MAX_TRACE_UPLOAD]; + gdb::byte_vector buf (std::max (MAX_TRACE_UPLOAD, trace_regblock_size)); enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); /* If the target is to save the data to a file on its own, then just @@ -144,7 +145,7 @@ trace_save (const char *filename, struct trace_file_writer *writer, /* We ask for big blocks, in the hopes of efficiency, but will take less if the target has packet size limitations or some such. */ - gotten = target_get_raw_trace_data (buf, offset, + gotten = target_get_raw_trace_data (buf.data (), offset, MAX_TRACE_UPLOAD); if (gotten < 0) error (_("Failure to get requested trace buffer data")); @@ -152,7 +153,7 @@ trace_save (const char *filename, struct trace_file_writer *writer, if (gotten == 0) break; - writer->ops->write_trace_buffer (writer, buf, gotten); + writer->ops->write_trace_buffer (writer, buf.data (), gotten); offset += gotten; } @@ -163,7 +164,7 @@ trace_save (const char *filename, struct trace_file_writer *writer, /* Parse the trace buffers according to how data are stored in trace buffer in GDBserver. */ - gotten = target_get_raw_trace_data (buf, offset, 6); + gotten = target_get_raw_trace_data (buf.data (), offset, 6); if (gotten == 0) break; @@ -171,10 +172,10 @@ trace_save (const char *filename, struct trace_file_writer *writer, /* Read the first six bytes in, which is the tracepoint number and trace frame size. */ tp_num = (uint16_t) - extract_unsigned_integer (&buf[0], 2, byte_order); + extract_unsigned_integer (&((buf.data ())[0]), 2, byte_order); tf_size = (uint32_t) - extract_unsigned_integer (&buf[2], 4, byte_order); + extract_unsigned_integer (&((buf.data ())[2]), 4, byte_order); writer->ops->frame_ops->start (writer, tp_num); gotten = 6; @@ -192,7 +193,8 @@ trace_save (const char *filename, struct trace_file_writer *writer, /* We'll fetch one block each time, in order to handle the extremely large 'M' block. We first fetch one byte to get the type of the block. */ - gotten = target_get_raw_trace_data (buf, offset, 1); + gotten = target_get_raw_trace_data (buf.data (), + offset, 1); if (gotten < 1) error (_("Failure to get requested trace buffer data")); @@ -205,13 +207,13 @@ trace_save (const char *filename, struct trace_file_writer *writer, { case 'R': gotten - = target_get_raw_trace_data (buf, offset, + = target_get_raw_trace_data (buf.data (), offset, trace_regblock_size); if (gotten < trace_regblock_size) error (_("Failure to get requested trace" " buffer data")); - TRACE_WRITE_R_BLOCK (writer, buf, + TRACE_WRITE_R_BLOCK (writer, buf.data (), trace_regblock_size); break; case 'M': @@ -221,7 +223,8 @@ trace_save (const char *filename, struct trace_file_writer *writer, LONGEST t; int j; - t = target_get_raw_trace_data (buf,offset, 10); + t = target_get_raw_trace_data (buf.data (), + offset, 10); if (t < 10) error (_("Failure to get requested trace" " buffer data")); @@ -231,10 +234,10 @@ trace_save (const char *filename, struct trace_file_writer *writer, gotten = 0; addr = (ULONGEST) - extract_unsigned_integer (buf, 8, + extract_unsigned_integer (buf.data (), 8, byte_order); mlen = (unsigned short) - extract_unsigned_integer (&buf[8], 2, + extract_unsigned_integer (&((buf.data ())[8]), 2, byte_order); TRACE_WRITE_M_BLOCK_HEADER (writer, addr, @@ -252,14 +255,15 @@ trace_save (const char *filename, struct trace_file_writer *writer, else read_length = mlen - j; - t = target_get_raw_trace_data (buf, + t = target_get_raw_trace_data (buf.data (), offset + j, read_length); if (t < read_length) error (_("Failure to get requested" " trace buffer data")); - TRACE_WRITE_M_BLOCK_MEMORY (writer, buf, + TRACE_WRITE_M_BLOCK_MEMORY (writer, + buf.data (), read_length); j += read_length; @@ -274,18 +278,18 @@ trace_save (const char *filename, struct trace_file_writer *writer, LONGEST val; gotten - = target_get_raw_trace_data (buf, offset, - 12); + = target_get_raw_trace_data (buf.data (), + offset, 12); if (gotten < 12) error (_("Failure to get requested" " trace buffer data")); - vnum = (int) extract_signed_integer (buf, + vnum = (int) extract_signed_integer (buf.data (), 4, byte_order); val - = extract_signed_integer (&buf[4], 8, - byte_order); + = extract_signed_integer (&((buf.data ())[4]), + 8, byte_order); TRACE_WRITE_V_BLOCK (writer, vnum, val); } -- 2.7.4