From: Eric Blake <eblake@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-trivial@nongnu.org, Stefan Weil <sw@weilnetz.de>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-trivial] [Qemu-devel] [PATCH] virtfs-proxy-helper: check return code of setfsgid/setfsuid
Date: Wed, 10 Oct 2012 11:58:22 -0600 [thread overview]
Message-ID: <5075B73E.9020506@redhat.com> (raw)
In-Reply-To: <50759F9E.3060800@redhat.com>
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On 10/10/2012 10:17 AM, Paolo Bonzini wrote:
> Il 10/10/2012 18:14, Stefan Weil ha scritto:
>>>
>>>
>>> diff --git a/fsdev/virtfs-proxy-helper.c b/fsdev/virtfs-proxy-helper.c
>>> index f9a8270..b34a84a 100644
>>> --- a/fsdev/virtfs-proxy-helper.c
>>> +++ b/fsdev/virtfs-proxy-helper.c
>>> @@ -290,8 +290,12 @@ static int setfsugid(int uid, int gid)
>>> CAP_DAC_OVERRIDE,
>>> };
>>> - setfsgid(gid);
>>> - setfsuid(uid);
>>> + if (setfsgid(gid) != 0) {
>>> + return -1;
>>> + }
>>
>> Wouldn't setfsgid(gid) == gid be also ok?
>
> Of course, it should be < 0. I have no idea how to test this thing...
POSIX states that uid_t and gid_t may be unsigned, so checking for < 0
is not necessarily possible (really, all you can check for is equality
with the same value as ((uid_t)-1) when put through integer promotion
rules).
--
Eric Blake eblake@redhat.com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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next prev parent reply other threads:[~2012-10-10 17:58 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-10 11:32 [Qemu-trivial] [PATCH] virtfs-proxy-helper: check return code of setfsgid/setfsuid Paolo Bonzini
2012-10-10 16:14 ` [Qemu-trivial] [Qemu-devel] " Stefan Weil
2012-10-10 16:17 ` Paolo Bonzini
2012-10-10 16:23 ` Stefan Weil
2012-10-10 16:36 ` Paolo Bonzini
2012-10-10 16:54 ` Stefan Weil
2012-10-10 16:59 ` Stefan Weil
2012-10-11 7:25 ` M. Mohan Kumar
2012-10-11 12:25 ` Paolo Bonzini
2012-12-04 18:55 ` Aneesh Kumar K.V
2012-12-05 6:59 ` M. Mohan Kumar
2012-12-05 8:35 ` Aneesh Kumar K.V
2012-12-05 12:37 ` Paolo Bonzini
2012-12-12 13:52 ` [Qemu-trivial] " Paolo Bonzini
2012-12-12 16:50 ` Aneesh Kumar K.V
2012-10-10 17:00 ` [Qemu-trivial] [Qemu-devel] " Paolo Bonzini
2012-10-10 17:58 ` Eric Blake [this message]
2012-10-10 17:55 ` Eric Blake
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