Package: fakeroot
Version: 1.11
Severity: normal
Fakeroot wrapped calls to fchmodat() fail on large (>2gb?) files with EOVERFLOW.
I'm using debian lenny, fakeroot 1.11, in an i386 chroot on a system with an
amd64 kernel. An amd64 userspace does not appear to have this issue.
To reproduce, try calling fchmodat() via fakeroot on a 3gb file:
$ cat >test.cpp <<END
#include <sys/stat.h>
#include <sys/fcntl.h>
#include <sys/errno.h>
#include <stdio.h>
#include <string.h>
int main() {
if(fchmodat(AT_FDCWD, "bigfile", 0777, 0)) {
printf("failure: %d %s\n", errno, strerror(errno));
} else {
printf("ok\n");
}
}
END
$ g++ test.cpp -o test
$ dd if=/dev/zero of=bigfile bs=1000 count=3000000
3000000+0 records in
3000000+0 records out
3000000000 bytes (3.0 GB) copied, 38.8445 s, 77.2 MB/s
$ ./test
ok
$ fakeroot ./test
failure: 75 Value too large for defined data type
$
I suspect this is because the wrapper always delegates to fstatat() rather than
using fstatat64() when available. This diff appears to resolve the issue:
------------------------------
--- libfakeroot.c.original 2008-08-03 22:26:50.000000000 +0000
+++ libfakeroot.c 2009-05-08 18:53:30.000000000 +0000
@@ -900,11 +900,16 @@
int fchmodat(int dir_fd, const char *path, mode_t mode, int flags) {
/* (int fd, mode_t mode){*/
int r;
- struct stat st;
/* If AT_SYMLINK_NOFOLLOW is set in the fchownat call it should
be when we stat it. */
+#ifdef STAT64_SUPPORT
+ struct stat64 st;
+ r=NEXT_FSTATAT64(_STAT_VER, dir_fd, path, &st, flags & AT_SYMLINK_NOFOLLOW);
+#else
+ struct stat st;
r=NEXT_FSTATAT(_STAT_VER, dir_fd, path, &st, flags & AT_SYMLINK_NOFOLLOW);
+#endif
if(r)
return(r);
------------------------------
-- System Information:
Debian Release: 5.0.1
APT prefers stable
APT policy: (500, 'stable')
Architecture: i386 (x86_64)
Kernel: Linux 2.6.26-2-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=ANSI_X3.4-1968)
(ignored: LC_ALL set to C)
Shell: /bin/sh linked to /bin/bash
Versions of packages fakeroot depends on:
ii libc6 2.7-18 GNU C Library: Shared libraries
fakeroot recommends no packages.
fakeroot suggests no packages.
-- no debconf information
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