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| author | Dmitry V. Levin <ldv@altlinux.org> | 2015-06-18 21:40:46 +0000 |
|---|---|---|
| committer | Dmitry V. Levin <ldv@altlinux.org> | 2015-06-23 09:37:28 +0000 |
| commit | b57525f1a376149840f740a31535681c07152ba4 (patch) | |
| tree | c520a3234fda67b9c99562eb1b06e090e9cc2bb5 /resolv/Makefile | |
| parent | 47852c972d1ad80d8b38d9e94507b27df0ede421 (diff) | |
| download | glibc-b57525f1a376149840f740a31535681c07152ba4.zip glibc-b57525f1a376149840f740a31535681c07152ba4.tar.gz glibc-b57525f1a376149840f740a31535681c07152ba4.tar.bz2 | |
Fix potential hanging of gethostbyaddr_r/gethostbyname_r
When "reorder" resolver option is enabled, threads of a multi-threaded process
could hang in gethostbyaddr_r, gethostbyname_r, or gethostbyname2_r.
Due to a trivial bug in _res_hconf_reorder_addrs, simultaneous
invocations of this function in a multi-threaded process could result to
_res_hconf_reorder_addrs returning without releasing the lock it holds,
causing other threads to block indefinitely while waiting for the lock
that is not going to be released.
[BZ #17977]
* resolv/res_hconf.c (_res_hconf_reorder_addrs): Fix unlocking
when initializing interface list, based on the bug analysis
and the patch proposed by Eric Newton.
* resolv/tst-res_hconf_reorder.c: New test.
* resolv/Makefile [$(have-thread-library) = yes] (tests): Add
tst-res_hconf_reorder.
($(objpfx)tst-res_hconf_reorder): Depend on $(libdl)
and $(shared-thread-library).
(tst-res_hconf_reorder-ENV): New variable.
Diffstat (limited to 'resolv/Makefile')
| -rw-r--r-- | resolv/Makefile | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/resolv/Makefile b/resolv/Makefile index f62eea4..3509d98 100644 --- a/resolv/Makefile +++ b/resolv/Makefile @@ -39,6 +39,7 @@ extra-libs := libresolv libnss_dns ifeq ($(have-thread-library),yes) extra-libs += libanl routines += gai_sigqueue +tests += tst-res_hconf_reorder endif extra-libs-others = $(extra-libs) libresolv-routines := gethnamaddr res_comp res_debug \ @@ -98,6 +99,9 @@ $(objpfx)libanl.so: $(shared-thread-library) $(objpfx)ga_test: $(objpfx)libanl.so $(shared-thread-library) +$(objpfx)tst-res_hconf_reorder: $(libdl) $(shared-thread-library) +tst-res_hconf_reorder-ENV = RESOLV_REORDER=on + $(objpfx)tst-leaks: $(objpfx)libresolv.so tst-leaks-ENV = MALLOC_TRACE=$(objpfx)tst-leaks.mtrace $(objpfx)mtrace-tst-leaks.out: $(objpfx)tst-leaks.out |