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Blame SOURCES/0045-gdb-disable-loading-of-auto-loaded-files.patch

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From 5a2f83cd86ce824167fa7ea8e5357c014034ed46 Mon Sep 17 00:00:00 2001
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From: Jakub Filak <jfilak@redhat.com>
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Date: Mon, 9 Jun 2014 17:13:09 +0200
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Subject: [ABRT PATCH 45/66] gdb: disable loading of auto-loaded files
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https://sourceware.org/gdb/onlinedocs/gdb/Auto_002dloading.html
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There are two main reasons for doing so:
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1. we cannot trust anybody
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  - the auto-loaded file may change the output format
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  - security?
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2. bugs in such a files (#817)
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Resolves: #1128637
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Signed-off-by: Jakub Filak <jfilak@redhat.com>
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---
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 src/lib/hooklib.c | 40 +++++++++++++++++++++-------------------
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 1 file changed, 21 insertions(+), 19 deletions(-)
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diff --git a/src/lib/hooklib.c b/src/lib/hooklib.c
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index 4a50727..21ad9e0 100644
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--- a/src/lib/hooklib.c
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+++ b/src/lib/hooklib.c
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@@ -252,10 +252,12 @@ char *get_backtrace(const char *dump_dir_name, unsigned timeout_sec, const char
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     /* Let user know what's going on */
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     log(_("Generating backtrace"));
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-    char *args[21];
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+    char *args[23];
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     args[0] = (char*)"gdb";
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     args[1] = (char*)"-batch";
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     args[2] = (char*)"-ex";
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+    args[3] = (char*)"set auto-load off";
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+    args[4] = (char*)"-ex";
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     struct strbuf *set_debug_file_directory = strbuf_new();
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     if(debuginfo_dirs == NULL)
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     {
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@@ -278,7 +280,7 @@ char *get_backtrace(const char *dump_dir_name, unsigned timeout_sec, const char
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             p = colon_or_nul;
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         }
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     }
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-    args[3] = strbuf_free_nobuf(set_debug_file_directory);
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+    args[5] = strbuf_free_nobuf(set_debug_file_directory);
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     /* "file BINARY_FILE" is needed, without it gdb cannot properly
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      * unwind the stack. Currently the unwind information is located
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@@ -300,27 +302,27 @@ char *get_backtrace(const char *dump_dir_name, unsigned timeout_sec, const char
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      * TODO: check mtimes on COREFILE and BINARY_FILE and not supply
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      * BINARY_FILE if it is newer (to at least avoid gdb complaining).
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      */
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-    args[4] = (char*)"-ex";
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-    args[5] = xasprintf("file %s", executable);
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-    free(executable);
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-
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     args[6] = (char*)"-ex";
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-    args[7] = xasprintf("core-file %s/"FILENAME_COREDUMP, dump_dir_name);
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+    args[7] = xasprintf("file %s", executable);
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+    free(executable);
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     args[8] = (char*)"-ex";
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-    /*args[9] = ... see below */
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+    args[9] = xasprintf("core-file %s/"FILENAME_COREDUMP, dump_dir_name);
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+
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     args[10] = (char*)"-ex";
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-    args[11] = (char*)"info sharedlib";
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-    /* glibc's abort() stores its message in __abort_msg variable */
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+    /*args[11] = ... see below */
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     args[12] = (char*)"-ex";
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-    args[13] = (char*)"print (char*)__abort_msg";
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+    args[13] = (char*)"info sharedlib";
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+    /* glibc's abort() stores its message in __abort_msg variable */
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     args[14] = (char*)"-ex";
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-    args[15] = (char*)"print (char*)__glib_assert_msg";
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+    args[15] = (char*)"print (char*)__abort_msg";
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     args[16] = (char*)"-ex";
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-    args[17] = (char*)"info all-registers";
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+    args[17] = (char*)"print (char*)__glib_assert_msg";
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     args[18] = (char*)"-ex";
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-    args[19] = (char*)"disassemble";
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-    args[20] = NULL;
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+    args[19] = (char*)"info all-registers";
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+    args[20] = (char*)"-ex";
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+    args[21] = (char*)"disassemble";
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+    args[22] = NULL;
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     /* Get the backtrace, but try to cap its size */
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     /* Limit bt depth. With no limit, gdb sometimes OOMs the machine */
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@@ -330,9 +332,9 @@ char *get_backtrace(const char *dump_dir_name, unsigned timeout_sec, const char
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     char *bt = NULL;
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     while (1)
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     {
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-        args[9] = xasprintf("%s backtrace %u%s", thread_apply_all, bt_depth, full);
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+        args[11] = xasprintf("%s backtrace %u%s", thread_apply_all, bt_depth, full);
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         bt = exec_vp(args, /*redirect_stderr:*/ 1, timeout_sec, NULL);
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-        free(args[9]);
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+        free(args[11]);
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         if ((bt && strnlen(bt, 256*1024) < 256*1024) || bt_depth <= 32)
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         {
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             break;
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@@ -357,7 +359,7 @@ char *get_backtrace(const char *dump_dir_name, unsigned timeout_sec, const char
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          * End of assembler dump.
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          * (IOW: "empty" dump)
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          */
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-        args[19] = (char*)"disassemble $pc-20, $pc+64";
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+        args[21] = (char*)"disassemble $pc-20, $pc+64";
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         if (bt_depth <= 64 && thread_apply_all[0] != '\0')
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         {
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@@ -373,9 +375,9 @@ char *get_backtrace(const char *dump_dir_name, unsigned timeout_sec, const char
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         }
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     }
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-    free(args[3]);
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     free(args[5]);
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     free(args[7]);
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+    free(args[9]);
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     return bt;
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 }
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-- 
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1.8.3.1
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