Messages in this thread | | | Date | Tue, 21 Sep 2004 09:47:20 -0400 (EDT) | From | "Richard B. Johnson" <> | Subject | Re: [BUG][2.6.8.1] Nevver dump core while /dev/men is mmaped |
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On Tue, 21 Sep 2004, Peter Seiderer wrote:
> Hello, > the following short program stops my computer immediately (no more > input, telnet etc. possible): > > --- begin --- > #include <stdio.h> > #include <sys/types.h> > #include <sys/stat.h> > #include <fcntl.h> > #include <sys/mman.h> > #include <assert.h> > > int main(int argc, char *argv[]) { > int fd; > assert((fd = open("/dev/mem", O_RDWR)) != (-1)); > > size_t s = 67108864; > void *m; > assert((m = mmap(NULL, s, PROT_READ|PROT_WRITE, MAP_SHARED, fd, > 0xd0000000)) != NULL); ^^^^^^^^^^^^^^^ Incorrect. mmap() returns MAP_FAILED, (void *)-1, when it fails, not NULL, (void *)0.
Cheers, Dick Johnson Penguin : Linux version 2.4.26 on an i686 machine (5570.56 BogoMips). Note 96.31% of all statistics are fiction.
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