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From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
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From: Keith Seitz <keiths@redhat.com>
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Date: Fri, 11 Jan 2019 17:02:13 -0500
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Subject: gdb-rhbz1187581-power8-regs-not-in-8.2-03of15.patch
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;; Zero-initialize linux note sections
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;; Pedro Franco de Carvalho, RH BZ 1187581
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Zero-initialize linux note sections
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This patches changes linux-tdep.c so that the buffer used to write
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note sections when generating a core file is zero-initialized. This
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way, bytes that are not collected won't contain random
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data (e.g. padding bytes).
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gdb/ChangeLog:
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2018-10-26 Pedro Franco de Carvalho <pedromfc@linux.ibm.com>
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* linux-tdep.c (linux_collect_regset_section_cb): Use
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std::vector<gdb_byte> instead of char * and malloc for buf.
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Remove xfree.
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diff --git a/gdb/linux-tdep.c b/gdb/linux-tdep.c
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--- a/gdb/linux-tdep.c
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+++ b/gdb/linux-tdep.c
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@@ -1584,7 +1584,6 @@ linux_collect_regset_section_cb (const char *sect_name, int supply_size,
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int collect_size, const struct regset *regset,
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const char *human_name, void *cb_data)
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{
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- char *buf;
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struct linux_collect_regset_section_cb_data *data
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= (struct linux_collect_regset_section_cb_data *) cb_data;
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bool variable_size_section = (regset != NULL
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@@ -1598,19 +1597,22 @@ linux_collect_regset_section_cb (const char *sect_name, int supply_size,
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gdb_assert (regset && regset->collect_regset);
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- buf = (char *) xmalloc (collect_size);
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- regset->collect_regset (regset, data->regcache, -1, buf, collect_size);
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+ /* This is intentionally zero-initialized by using std::vector, so
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+ that any padding bytes in the core file will show as 0. */
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+ std::vector<gdb_byte> buf (collect_size);
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+
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+ regset->collect_regset (regset, data->regcache, -1, buf.data (),
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+ collect_size);
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/* PRSTATUS still needs to be treated specially. */
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if (strcmp (sect_name, ".reg") == 0)
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data->note_data = (char *) elfcore_write_prstatus
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(data->obfd, data->note_data, data->note_size, data->lwp,
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- gdb_signal_to_host (data->stop_signal), buf);
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+ gdb_signal_to_host (data->stop_signal), buf.data ());
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else
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data->note_data = (char *) elfcore_write_register_note
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(data->obfd, data->note_data, data->note_size,
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- sect_name, buf, collect_size);
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- xfree (buf);
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+ sect_name, buf.data (), collect_size);
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if (data->note_data == NULL)
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data->abort_iteration = 1;
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