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Don't process DWARF generated from non-C/C++ code.

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ctfconvert(1) is not designed to handle DWARF generated from such code,
and will generally fail in non-obvious ways.  Use an explicit check to
help catch such potential failures.

Reported by:	Johannes Lundberg <johalun0@gmail.com>
MFC after:	2 weeks
This commit is contained in:
Mark Johnston 2018-06-09 15:10:49 +00:00
parent 593e2c6ece
commit c5fda9bac0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=334883
1 changed files with 22 additions and 3 deletions
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25
cddl/contrib/opensolaris/tools/ctf/cvt/dwarf.c
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@ -1901,7 +1901,7 @@ should_have_dwarf(Elf *elf)
int
dw_read(tdata_t *td, Elf *elf, char *filename __unused)
{
Dwarf_Unsigned abboff, hdrlen, nxthdr;
Dwarf_Unsigned abboff, hdrlen, lang, nxthdr;
Dwarf_Half vers, addrsz, offsz;
Dwarf_Die cu = 0;
Dwarf_Die child = 0;
@ -1941,8 +1941,8 @@ dw_read(tdata_t *td, Elf *elf, char *filename __unused)
}
if ((rc = dwarf_next_cu_header_b(dw.dw_dw, &hdrlen, &vers, &abboff,
&addrsz, &offsz, NULL, &nxthdr, &dw.dw_err)) != DW_DLV_OK) {
if (dw.dw_err.err_error == DW_DLE_NO_ENTRY)
&addrsz, &offsz, NULL, &nxthdr, &dw.dw_err)) != DW_DLV_OK) {
if (dw.dw_err.err_error == DW_DLE_NO_ENTRY)
exit(0);
else
terminate("rc = %d %s\n", rc, dwarf_errmsg(dw.dw_err));
@ -1972,6 +1972,25 @@ dw_read(tdata_t *td, Elf *elf, char *filename __unused)
free(prod);
}
if (dwarf_attrval_unsigned(cu, DW_AT_language, &lang, &dw.dw_err) == 0)
switch (lang) {
case DW_LANG_C:
case DW_LANG_C89:
case DW_LANG_C99:
case DW_LANG_C11:
case DW_LANG_C_plus_plus:
case DW_LANG_C_plus_plus_03:
case DW_LANG_C_plus_plus_11:
case DW_LANG_C_plus_plus_14:
break;
default:
terminate("file contains DWARF for unsupported "
"language %d", lang);
}
else
warning("die %llu: failed to get language attribute: %s\n",
die_off(&dw, cu), dwarf_errmsg(dw.dw_err));
if ((dw.dw_cuname = die_name(&dw, cu)) != NULL) {
char *base = xstrdup(basename(dw.dw_cuname));
free(dw.dw_cuname);