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Bug #2030

closed

fstatfs() fails in chroot environments

Added by ftigeot over 13 years ago. Updated over 13 years ago.

Status:
Closed
Priority:
Normal
Assignee:
-
Category:
-
Target version:
-
Start date:
Due date:
% Done:

0%

Estimated time:

Description

While investigation a ld-elf.so.2 error, I found out the following call returns
a non-zero value in a chroot:

fstatfs(fd, &fs)

the returned value is actually ENOENT, but the corresponding file exists

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 #1

Updated by alexh over 13 years ago

On what file system does this happen?

Regards,
Alex

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 #2

Updated by ftigeot over 13 years ago

On Mon, Mar 21, 2011 at 09:09:27PM +0000, Alex Hornung (via DragonFly issue tracker) wrote:

Alex Hornung <> added the comment:

On what file system does this happen?

Hammer. root / non-root does not really make any difference.

I have written a test program available here:
http://dl.zefyris.com/fstatfs.c

Cheers,
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 #3

Updated by swildner over 13 years ago

On 3/21/2011 9:49, Francois Tigeot (via DragonFly issue tracker) wrote:

New submission from Francois Tigeot<>:

While investigation a ld-elf.so.2 error, I found out the following call returns
a non-zero value in a chroot:

fstatfs(fd,&fs)

the returned value is actually ENOENT, but the corresponding file exists

I followed the path a bit and it fails in cache_fullpath() in
sys/kern/vfs_cache.c in line #3281 in the "if (ncp == NULL)" check.

Sascha

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 #4

Updated by dillon over 13 years ago

fixed in 92734e3dc3576d68a28eb7d539dd48de730ab82d. fstat[v]fs() was using the
wrong mount pointer when calling cache_fullpath().

Also note that the test program supplied is buggy, this line is broken and
causes the fd to be assigned the value 0:

if (fd = open(FILE_PATH, O_RDONLY) -1) ... should be
if ((fd = open(FILE_PATH, O_RDONLY)) -1) ...

-Matt

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