Bastian Blank wrote:
> On Tue, Jan 26, 2010 at 01:48:34PM -0600, Jonathan Nieder wrote:
> > severity 563882 critical
>
> Please explain. git is neither unrelated to glibc nor does this cause
> serious data loss.
My mistake, sorry about that.
> The test program does not properly show what is going on.
>
> The following program shows the cause:
>
> | #include <sys/stat.h>
> | #include <sys/mman.h>
> | #include <fcntl.h>
> |
> | int main(int argc, const char * const argv[])
> | {
> | struct stat st;
> | lstat(argv[1], &st);
> |
> | int fd = open(argv[1], O_RDONLY);
> | void *data = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
> | void *t = memchr(data, 0, st.st_size);
> | printf("ptr: %p, ret: %p, len: 0x%zx\n", data, t, st.st_size);
> | return 0;
> | }
>
> Example output:
> | % ./test /etc/passwd
> | ptr: 0x2000000000050000, ret: 0x200000000005040e, len: 0x40e
>
> The found location is already after the buffer. memchr is AFAIK expanded
> by gcc.
Thanks for the clear test case.
Given gcc -S output, I would gladly look it over.
Regards,
Jonathan
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