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authorUlrich Drepper <drepper@redhat.com>1996-12-08 08:01:13 +0000
committerUlrich Drepper <drepper@redhat.com>1996-12-08 08:01:13 +0000
commitf65fd747b440ae2d8a7481ecc50e668c5e4d0cc9 (patch)
treef64c3eeda0e9acc58b96c28ca852a014c822047f /malloc/mallocbug.c
parent42054ddb496798d9b936490cf0050f6619f86bc1 (diff)
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update from main archive 961207cvs/libc-961208
Sun Dec 8 06:56:49 1996 Ulrich Drepper <drepper@cygnus.com> * io/getwd.c: Use PATH_MAX not LOCAL_PATH_MAX. Fix typo in comment. * stdlib/canonicalize.c: Correct bugs in last change. Patch by HJ Lu. * libio/Makefile (routines): Remove ioprims. (aux): Remove cleanup. Add IO_DEBUG option for .o files. * libio/cleanups.c: Removed. * libio/ioprims.c: Removed. * libio/filedoalloc.c: More updates from libg++-2.8b5. * libio/fileops.c: Likewise. * libio/genops.c: Likewise. * libio/iolibio.h: Likewise. * libio/iopopen.c: Likewise. * libio/iovsprintf.c: Likewise. * libio/iovsscanf.c: Likewise. * libio/libio.h: Likewise. * libio/libioP.h: Likewise. * libio/memstream.c: Likewise. * libio/strfile.h: Likewise. * libio/vasprintf.c: Likewise. * libio/vsnprintf.c: Likewise. * libio/stdio.h: Define P_tmpdir only is __USE_SVID. * manual/arith.texi: Change references to ANSI C to ISO C. * manual/conf.texi: Likewise. * manual/creature.texi: Likewise. * manual/ctype.texi: Likewise. * manual/errno.texi: Likewise. * manual/filesys.texi: Likewise. * manual/intro.texi. Likewise. * manual/io.texi: Likewise. * manual/lang.texi: Likewise. * manual/libc.texinfo: Likewise. * manual/locale.texi: Likewise. * manual/maint.texi: Likewise. * manual/mbyte.texi: Likewise. * manual/memory.texi: Likewise. * manual/process.texi: Likewise. * manual/process.texi: Likewise. * manual/search.texi: Likewise. * manual/setjmp.texi: Likewise. * manual/signal.texi: Likewise. * manual/startup.texi: Likewise. * manual/stdio.texi: Likewise. * manual/string.texi: Likewise. * manual/time.texi: Likewise. * manual/locale.texi: Remove description of LC_RESPONSE and add LC_MESSAGES. * Makefile (subdirs): Change malloc in $(malloc). * config.make.in: Add variable malloc which is initialized from @malloc@. * configure.in: Add new option --enable-new-malloc to use new malloc. This is the default on Linux. * sysdeps/unix/sysv/linux/configure.in: Define malloc to new-malloc by default. * new-malloc/Makefile: New file. Improved malloc implementation. * new-malloc/malloc.c: Likewise. * new-malloc/malloc.h: Likewise. * new-malloc/mallocbug.c: Likewise. * new-malloc/obstack.c: Likewise. * new-malloc/obstack.h: Likewise. * new-malloc/thread-m.h: Likewise. * time/Makefile: Compile ap.c with NO_MCHECK flag for now. * time/ap.c: Don't call mcheck if NO_MCHECK is defined. * resolv/Makefile: Add rule to rebuiild libresolv.so when libc.so changed. * stdio/feof.c: Update copyright. * stdio/stdio.h: Add field for lock to FILE structure. Add cast to *MAGIC constants to prevent warnings. * stdio-common/bug7.c: Correct test. Stream must not be closed twice. * stdlib/Makefile (routines): Add secure-getenv. * stdlib/secure-getenv.c: New file. __secure_getenv function moved to here from sysdeps/generic/getenv.c. Otherwise an application cannot replace the getenv function in the libc. * sysdeps/generic/getenv.c: Remove __secure_getenv function. * sysdeps/stub/getenv.c: Remove __secure_getenv alias. * sysdeps/mach/libc-lock.h: Define__libc_mutex_lock to __mutex_lock. * sysdeps/posix/fdopen.c: Update copyright. Don't use EXFUN. * time/test-tz.c: Comment fifth test out. PROBLEM. * time/tzset.c: De-ANSI-declfy. (__tzset): Don't increment pointer tz when no DST information is given. Sat Dec 7 23:47:54 1996 Ulrich Drepper <drepper@cygnus.com> * sysdeps/mach/libc-lock.h [_LIBC]: Add definition of __libc_mutex_lock. Patch by Thomas Bushnell. * sysdeps/unix/sysv/linux/timebits.h: Load <asm/param.h> only if __USE_MISC. * sysdeps/unix/sysv/linux/Dist: Add llseek.c. Sat Dec 7 12:18:56 1996 Ulrich Drepper <drepper@cygnus.com> * time/strftime (%c format): Remove %Z from default string. Reported by Paul Eggert * io/getwd.c: Don't apply getcwd on user supplied buffer.
Diffstat (limited to 'malloc/mallocbug.c')
-rw-r--r--malloc/mallocbug.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/malloc/mallocbug.c b/malloc/mallocbug.c
new file mode 100644
index 0000000..84a6387
--- /dev/null
+++ b/malloc/mallocbug.c
@@ -0,0 +1,67 @@
+/* Reproduce a GNU malloc bug. */
+#include <malloc.h>
+#include <stdio.h>
+#include <string.h>
+
+#define size_t unsigned int
+
+int
+main (int argc, char *argv[])
+{
+ char *dummy0;
+ char *dummy1;
+ char *fill_info_table1;
+ char *over_top;
+ size_t over_top_size = 0x3000;
+ char *over_top_dup;
+ size_t over_top_dup_size = 0x7000;
+ char *x;
+ size_t i;
+
+ /* Here's what memory is supposed to look like (hex):
+ size contents
+ 3000 original_info_table, later fill_info_table1
+ 3fa000 dummy0
+ 3fa000 dummy1
+ 6000 info_table_2
+ 3000 over_top
+
+ */
+ /* mem: original_info_table */
+ dummy0 = malloc (0x3fa000);
+ /* mem: original_info_table, dummy0 */
+ dummy1 = malloc (0x3fa000);
+ /* mem: free, dummy0, dummy1, info_table_2 */
+ fill_info_table1 = malloc (0x3000);
+ /* mem: fill_info_table1, dummy0, dummy1, info_table_2 */
+
+ x = malloc (0x1000);
+ free (x);
+ /* mem: fill_info_table1, dummy0, dummy1, info_table_2, freexx */
+
+ /* This is what loses; info_table_2 and freexx get combined unbeknownst
+ to mmalloc, and mmalloc puts over_top in a section of memory which
+ is on the free list as part of another block (where info_table_2 had
+ been). */
+ over_top = malloc (over_top_size);
+ over_top_dup = malloc (over_top_dup_size);
+ memset (over_top, 0, over_top_size);
+ memset (over_top_dup, 1, over_top_dup_size);
+
+ for (i = 0; i < over_top_size; ++i)
+ if (over_top[i] != 0)
+ {
+ printf ("FAIL: malloc expands info table\n");
+ return 0;
+ }
+
+ for (i = 0; i < over_top_dup_size; ++i)
+ if (over_top_dup[i] != 1)
+ {
+ printf ("FAIL: malloc expands info table\n");
+ return 0;
+ }
+
+ printf ("PASS: malloc expands info table\n");
+ return 0;
+}