Bug 206740

Summary:

There is no check for iconv* functions when the libiconv library loaded by dlopen

Product:

Base System

Reporter:

Iouri V. Ivliev <fbsd>

Component:

bin

Assignee:

freebsd-bugs (Nobody) <bugs>

Status:

Closed Overcome By Events

Severity:

Affects Some People

CC:

ardovm, vas, w.schwarzenfeld

Priority:

---

Keywords:

patch

Version:

9.3-STABLE

Hardware:

Any

OS:

Any

Attachments:

Description	Flags
fixes use of iconv* functions from library loaded by dlopen.	none

Description Iouri V. Ivliev 2016-01-29 17:42:10 UTC

Created attachment 166274 [details]
fixes use of iconv* functions from library loaded by dlopen.

When the world is compiled without iconv support in libc, some code in the base system tries to use the iconv* functions from the external library (usually converters/libiconv port). For now, the code in libkiconv and libsmb doesn't check the presence of iconv* functions in the loaded library. Starting with libiconv-1.14_9 iconv* rymbols are not exported from libiconv.so. As a result, there is a segmentation faults in the code that uses libkiconv and libsmb.

A set of patches for libkiconv, libsmb and csh fixes some issues when use iconv* functions from libiconv loaded by dlopen(3):
1. allows to load alternative libiconv library using LIBICONV environment variable.
2. tries fallback to iconv_open, iconv and iconv_close functions when libiconv_open, libiconv and libiconv_close symbols are not exported from loaded library.
3. an error will be returned when any functions are missing in the library.

This should fix at least https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205256 and segfaults in mount_msdosfs.

Comment 1 Walter Schwarzenfeld freebsd_triage

2018-09-03 14:54:17 UTC

see bug #205256. Overcome by events.