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dwarfsrcfiles: Avoid races over debug-link files

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We use dwarfsrcfiles in package.bbclass to list the source files used by a binary.
This is done before they're stripped and linked to debug symbols in separate files.

It is possible a binary may already have a link to separate debug symbols, e.g.
some of the test binaries in lttng-tools ptest. In those cases, the linked binary
may be changed by package.bbclass code whilst dwarfsrcfiles is reading it. That
would result in a rare SIGBUS race causing the binary to fail.

To avoid this, break the debug file search path so no other binaries are found.

Also fix a segfault if no binary is specified while here.

[YOCTO #14400]

(From OE-Core rev: efef732859e265533acf16f2f4da3b29d50e0df4)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Richard Purdie
2021-07-06 11:36:16 +01:00
parent bdf408ca92
commit 5c928099ed
1 changed files with 10 additions and 3 deletions
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13
meta/recipes-devtools/dwarfsrcfiles/files/dwarfsrcfiles.c
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@@ -9,6 +9,7 @@
#include <argp.h>
#include <stdio.h>
#include <stdlib.h>
#include <dwarf.h>
#include <elfutils/libdw.h>
@@ -83,13 +84,15 @@ process_cu (Dwarf_Die *cu_die)
int
main (int argc, char **argv)
{
char* args[3];
char* args[5];
int res = 0;
Dwfl *dwfl;
Dwarf_Addr bias;
if (argc != 2)
if (argc != 2) {
fprintf(stderr, "Usage %s <file>", argv[0]);
exit(EXIT_FAILURE);
}
// Pretend "dwarfsrcfiles -e <file>" was given, so we can use standard
// dwfl argp parser to open the file for us and get our Dwfl. Useful
@@ -98,8 +101,12 @@ main (int argc, char **argv)
args[0] = argv[0];
args[1] = "-e";
args[2] = argv[1];
// We don't want to follow debug linked files due to the way OE processes
// files, could race against changes in the linked binary (e.g. objcopy on it)
args[3] = "--debuginfo-path";
args[4] = "/not/exist";
argp_parse (dwfl_standard_argp (), 3, args, 0, NULL, &dwfl);
argp_parse (dwfl_standard_argp (), 5, args, 0, NULL, &dwfl);
Dwarf_Die *cu = NULL;
while ((cu = dwfl_nextcu (dwfl, cu, &bias)) != NULL)