Hi,
The registry loader mmaps the "system.1st" file and then reads it.
However, if the file is empty (as in my case), then mmap() returns
success with (void *)0 as return value without having any valid address
mapped (it is not listed in /proc/xyz/maps). I do not know whether this
is a bug or a feature of either linux-kernel or glibc.
There are probably some other places in the source where this should be
checked and corrected if necessary.
Greetings Bertho
Changelog:
* Mmap does not fail on zero-length files
diff -urX diffexclude cleancvs/misc/registry.c builtclean/misc/registry.c
--- cleancvs/misc/registry.c Mon May 1 17:42:44 2000
+++ builtclean/misc/registry.c Mon May 1 22:08:40 2000
@@ -1063,6 +1063,7 @@
/* map the registry into the memory */
if ((fd = open(full_name.long_name, O_RDONLY | O_NONBLOCK)) == -1) return
FALSE;
if ((fstat(fd, &st) == -1)) goto error;
+ if (!st.st_size) goto error;
if ((base = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0)) ==
MAP_FAILED) goto error;
switch (*(LPDWORD)base)
