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* [Bug dynamic-link/27105] New: dlmopen crashes if library does not depend on libc
@ 2020-12-22 12:45 sware at reimardoeffinger dot de
0 siblings, 0 replies; only message in thread
From: sware at reimardoeffinger dot de @ 2020-12-22 12:45 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=27105
Bug ID: 27105
Summary: dlmopen crashes if library does not depend on libc
Product: glibc
Version: 2.32
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: dynamic-link
Assignee: unassigned at sourceware dot org
Reporter: sware at reimardoeffinger dot de
Target Milestone: ---
This code in dl-open.c assumes a libc is loaded:
if (!args->libc_already_loaded)
{
struct link_map *libc_map = GL(dl_ns)[args->nsid].libc_map;
#ifdef SHARED
bool initial = libc_map->l_ns == LM_ID_BASE;
(i.e. there is no check for libc_map being NULL)
However there seems to be no code that ensures this, and if dlmopen is used
this can easily be the case.
Trivial script to reproduce the issue:
#!/bin/bash
echo 'void dummytestfunc(void) {}' | gcc -o dummy.so -shared -Os -nostdlib -x c
-
gcc -o test -Os -x c - -ldl <<EOF
#define _GNU_SOURCE
#include <dlfcn.h>
int main()
{
dlmopen(LM_ID_NEWLM, "./dummy.so", RTLD_NOW);
return 0;
}
EOF
./test
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2020-12-22 12:45 [Bug dynamic-link/27105] New: dlmopen crashes if library does not depend on libc sware at reimardoeffinger dot de
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