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https://sourceware.org/PR24103
https://bugs.gentoo.org/676794
From da5c5336a1eaf519de246f7d9f0f5585e1d4ac59 Mon Sep 17 00:00:00 2001
From: Mark Wielaard <mark@klomp.org>
Date: Sun, 20 Jan 2019 23:05:56 +0100
Subject: [PATCH] libdwfl: Sanity check partial core file dyn data read.
When reading the dyn data from the core file check if we got everything,
or just part of the data.
https://sourceware.org/bugzilla/show_bug.cgi?id=24103
Signed-off-by: Mark Wielaard <mark@klomp.org>
---
libdwfl/dwfl_segment_report_module.c | 6 ++++++
--- a/libdwfl/dwfl_segment_report_module.c
+++ b/libdwfl/dwfl_segment_report_module.c
@@ -783,6 +783,12 @@ dwfl_segment_report_module (Dwfl *dwfl, int ndx, const char *name,
if (dyn_filesz != 0 && dyn_filesz % dyn_entsize == 0
&& ! read_portion (&dyn_data, &dyn_data_size, dyn_vaddr, dyn_filesz))
{
+ /* dyn_data_size will be zero if we got everything from the initial
+ buffer, otherwise it will be the size of the new buffer that
+ could be read. */
+ if (dyn_data_size != 0)
+ dyn_filesz = dyn_data_size;
+
void *dyns = malloc (dyn_filesz);
Elf32_Dyn (*d32)[dyn_filesz / sizeof (Elf32_Dyn)] = dyns;
Elf64_Dyn (*d64)[dyn_filesz / sizeof (Elf64_Dyn)] = dyns;
--
2.20.1
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