forked from pool/glibc
Accepting request 774214 from home:Andreas_Schwab:Factory
- fix-locking-in-_IO_cleanup.patch: update to latest version OBS-URL: https://build.opensuse.org/request/show/774214 OBS-URL: https://build.opensuse.org/package/show/Base:System/glibc?expand=0&rev=550
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@ -1,70 +1,34 @@
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Always do locking when accessing streams (bug 15142)
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Always do locking when accessing streams (bug 15142, bug 14697)
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During exit, skip files that are currently locked to avoid deadlock.
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Now that abort no longer calls fflush there is no reason to avoid locking
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the stdio streams anywhere. This fixes a conformance issue and potential
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heap corruption during exit. The test nptl/tst-stdio1 is removed as that
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was expecting the problematic behaviour.
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[BZ #15142]
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* libio/libio.h (_IO_ftrylockfile) [_IO_MTSAVE_IO]: Define.
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* libio/genops.c (_IO_flush_all_lockp): Make static. Rename
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argument to skip_locked, callers changed. Skip files that are
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locked if skip_locked.
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(_IO_unbuffer_all): Lock files before access, but skip locked
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files.
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* libio/libioP.h (_IO_flush_all_lockp): Don't declare.
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Index: glibc-2.27/libio/libio.h
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Index: glibc-2.31/libio/genops.c
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===================================================================
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--- glibc-2.27.orig/libio/libio.h
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+++ glibc-2.27/libio/libio.h
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@@ -33,11 +33,15 @@ libc_hidden_proto (_IO_vfscanf)
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if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_lock_lock (*(_fp)->_lock)
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# define _IO_funlockfile(_fp) \
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if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_lock_unlock (*(_fp)->_lock)
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+# define _IO_ftrylockfile(_fp) \
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+ (((_fp)->_flags & _IO_USER_LOCK) == 0 ? _IO_lock_trylock (*(_fp)->_lock) : 0)
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# else
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# define _IO_flockfile(_fp) \
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if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_flockfile (_fp)
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# define _IO_funlockfile(_fp) \
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if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_funlockfile (_fp)
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+# define _IO_ftrylockfile(_fp) \
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+ (((_fp)->_flags & _IO_USER_LOCK) == 0 ? _IO_ftrylockfile (_fp) : 0)
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# endif
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#endif /* _IO_MTSAFE_IO */
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Index: glibc-2.27/libio/genops.c
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===================================================================
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--- glibc-2.27.orig/libio/genops.c
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+++ glibc-2.27/libio/genops.c
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@@ -744,8 +744,8 @@ _IO_adjust_column (unsigned start, const
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}
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--- glibc-2.31.orig/libio/genops.c
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+++ glibc-2.31/libio/genops.c
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@@ -682,7 +682,7 @@ _IO_adjust_column (unsigned start, const
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libc_hidden_def (_IO_adjust_column)
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-int
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int
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-_IO_flush_all_lockp (int do_lock)
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+static int
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+_IO_flush_all_lockp (bool skip_locked)
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+_IO_flush_all (void)
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{
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int result = 0;
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FILE *fp;
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@@ -758,7 +758,16 @@ _IO_flush_all_lockp (int do_lock)
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@@ -695,8 +695,7 @@ _IO_flush_all_lockp (int do_lock)
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for (fp = (FILE *) _IO_list_all; fp != NULL; fp = fp->_chain)
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{
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run_fp = fp;
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- if (do_lock)
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+ if (skip_locked)
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+ {
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+ /* Skip files that are currently locked. */
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+ if (_IO_ftrylockfile (fp))
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+ {
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+ run_fp = NULL;
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+ continue;
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+ }
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+ }
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+ else
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_IO_flockfile (fp);
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- _IO_flockfile (fp);
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+ _IO_flockfile (fp);
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if (((fp->_mode <= 0 && fp->_IO_write_ptr > fp->_IO_write_base)
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@@ -769,8 +778,7 @@ _IO_flush_all_lockp (int do_lock)
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|| (_IO_vtable_offset (fp) == 0
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@@ -706,8 +705,7 @@ _IO_flush_all_lockp (int do_lock)
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&& _IO_OVERFLOW (fp, EOF) == EOF)
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result = EOF;
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@ -74,31 +38,32 @@ Index: glibc-2.27/libio/genops.c
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run_fp = NULL;
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}
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@@ -787,7 +795,7 @@ int
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_IO_flush_all (void)
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{
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/* We want locking. */
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- return _IO_flush_all_lockp (1);
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+ return _IO_flush_all_lockp (false);
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@@ -718,14 +716,6 @@ _IO_flush_all_lockp (int do_lock)
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return result;
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}
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-
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-
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-int
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-_IO_flush_all (void)
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-{
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- /* We want locking. */
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- return _IO_flush_all_lockp (1);
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-}
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libc_hidden_def (_IO_flush_all)
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@@ -852,6 +860,14 @@ _IO_unbuffer_all (void)
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for (fp = (FILE *) _IO_list_all; fp; fp = fp->_chain)
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void
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@@ -791,6 +781,9 @@ _IO_unbuffer_all (void)
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{
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+ run_fp = fp;
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+ /* Skip files that are currently locked. */
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+ if (_IO_ftrylockfile (fp))
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+ {
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+ run_fp = NULL;
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+ continue;
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+ }
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+
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int legacy = 0;
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+ run_fp = fp;
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+ _IO_flockfile (fp);
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+
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
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@@ -863,18 +879,6 @@ _IO_unbuffer_all (void)
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if (__glibc_unlikely (_IO_vtable_offset (fp) != 0))
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legacy = 1;
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@@ -800,18 +793,6 @@ _IO_unbuffer_all (void)
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/* Iff stream is un-orientated, it wasn't used. */
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&& (legacy || fp->_mode != 0))
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{
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@ -117,7 +82,7 @@ Index: glibc-2.27/libio/genops.c
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if (! legacy && ! dealloc_buffers && !(fp->_flags & _IO_USER_BUF))
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{
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fp->_flags |= _IO_USER_BUF;
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@@ -881,17 +885,15 @@ _IO_unbuffer_all (void)
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@@ -825,17 +806,15 @@ _IO_unbuffer_all (void)
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if (! legacy && fp->_mode > 0)
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_IO_wsetb (fp, NULL, NULL, 0);
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@ -138,24 +103,22 @@ Index: glibc-2.27/libio/genops.c
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}
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#ifdef _IO_MTSAFE_IO
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@@ -916,9 +918,9 @@ libc_freeres_fn (buffer_free)
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@@ -861,9 +840,7 @@ libc_freeres_fn (buffer_free)
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int
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_IO_cleanup (void)
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{
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- /* We do *not* want locking. Some threads might use streams but
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- that is their problem, we flush them underneath them. */
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- int result = _IO_flush_all_lockp (0);
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+ /* We want to skip locked streams. Some threads might use streams but
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+ that is their problem, we don't flush those. */
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+ int result = _IO_flush_all_lockp (true);
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+ int result = _IO_flush_all ();
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/* We currently don't have a reliable mechanism for making sure that
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C++ static destructors are executed in the correct order.
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Index: glibc-2.27/libio/libioP.h
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Index: glibc-2.31/libio/libioP.h
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===================================================================
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--- glibc-2.27.orig/libio/libioP.h
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+++ glibc-2.27/libio/libioP.h
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@@ -486,7 +486,6 @@ extern int _IO_new_do_write (FILE *, con
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--- glibc-2.31.orig/libio/libioP.h
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+++ glibc-2.31/libio/libioP.h
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@@ -487,7 +487,6 @@ extern int _IO_new_do_write (FILE *, con
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extern int _IO_old_do_write (FILE *, const char *, size_t);
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extern int _IO_wdo_write (FILE *, const wchar_t *, size_t);
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libc_hidden_proto (_IO_wdo_write)
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@ -163,3 +126,77 @@ Index: glibc-2.27/libio/libioP.h
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extern int _IO_flush_all (void);
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libc_hidden_proto (_IO_flush_all)
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extern int _IO_cleanup (void);
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Index: glibc-2.31/nptl/Makefile
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===================================================================
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--- glibc-2.31.orig/nptl/Makefile
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+++ glibc-2.31/nptl/Makefile
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@@ -295,7 +295,7 @@ tests = tst-attr1 tst-attr2 tst-attr3 ts
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tst-signal6 \
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tst-exec1 tst-exec2 tst-exec3 tst-exec4 tst-exec5 \
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tst-exit1 tst-exit2 tst-exit3 \
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- tst-stdio1 tst-stdio2 \
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+ tst-stdio2 \
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tst-stack1 tst-stack2 tst-stack3 tst-stack4 tst-pthread-getattr \
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tst-pthread-attr-affinity tst-pthread-mutexattr \
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tst-unload \
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Index: glibc-2.31/nptl/tst-stdio1.c
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===================================================================
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--- glibc-2.31.orig/nptl/tst-stdio1.c
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+++ /dev/null
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@@ -1,56 +0,0 @@
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-/* Copyright (C) 2002-2020 Free Software Foundation, Inc.
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- This file is part of the GNU C Library.
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- Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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-
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- The GNU C Library is free software; you can redistribute it and/or
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- modify it under the terms of the GNU Lesser General Public
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- License as published by the Free Software Foundation; either
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- version 2.1 of the License, or (at your option) any later version.
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-
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- The GNU C Library is distributed in the hope that it will be useful,
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- but WITHOUT ANY WARRANTY; without even the implied warranty of
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- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- Lesser General Public License for more details.
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-
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- You should have received a copy of the GNU Lesser General Public
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- License along with the GNU C Library; if not, see
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- <https://www.gnu.org/licenses/>. */
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-
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-#include <pthread.h>
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-#include <signal.h>
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-#include <stdio.h>
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-#include <unistd.h>
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-
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-static int do_test (void);
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-
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-#define TEST_FUNCTION do_test ()
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-#include "../test-skeleton.c"
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-
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-static void *tf (void *a)
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-{
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- flockfile (stdout);
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- /* This call should never return. */
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- return a;
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-}
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-
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-
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-int
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-do_test (void)
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-{
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- pthread_t th;
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-
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- flockfile (stdout);
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-
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- if (pthread_create (&th, NULL, tf, NULL) != 0)
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- {
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- write_message ("create failed\n");
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- _exit (1);
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- }
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-
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- delayed_exit (1);
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- xpthread_join (th);
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-
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- puts ("join returned");
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-
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- return 1;
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-}
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@ -1,3 +1,8 @@
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-------------------------------------------------------------------
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Thu Feb 13 14:16:05 UTC 2020 - Andreas Schwab <schwab@suse.de>
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- fix-locking-in-_IO_cleanup.patch: update to latest version
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-------------------------------------------------------------------
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Mon Feb 3 08:13:02 UTC 2020 - Andreas Schwab <schwab@suse.de>
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