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Re: [PATCH for-4.19 v2] tools/xl: Open xldevd.log with O_CLOEXEC
- To: Anthony PERARD <anthony.perard@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 24 Jun 2024 11:18:51 +0100
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>, Anthony PERARD <anthony@xxxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- Delivery-date: Mon, 24 Jun 2024 10:19:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 21/06/2024 5:55 pm, Anthony PERARD wrote:
> On Fri, Jun 21, 2024 at 05:16:56PM +0100, Andrew Cooper wrote:
>> `xl devd` has been observed leaking /var/log/xldevd.log into children.
>>
>> Note this is specifically safe; dup2() leaves O_CLOEXEC disabled on newfd, so
>> after setting up stdout/stderr, it's only the logfile fd which will close on
>> exec().
>>
>> Link: https://github.com/QubesOS/qubes-issues/issues/8292
>> Reported-by: Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> ---
>> CC: Anthony PERARD <anthony@xxxxxxxxxxxxxx>
>> CC: Juergen Gross <jgross@xxxxxxxx>
>> CC: Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
>> CC: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
>> CC: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
>>
>> Also entirely speculative based on the QubesOS ticket.
>>
>> v2:
>> * Extend the commit message to explain why stdout/stderr aren't closed by
>> this change
>>
>> For 4.19. This bugfix was posted earlier, but fell between the cracks.
>> ---
>> tools/xl/xl_utils.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/xl/xl_utils.c b/tools/xl/xl_utils.c
>> index 17489d182954..060186db3a59 100644
>> --- a/tools/xl/xl_utils.c
>> +++ b/tools/xl/xl_utils.c
>> @@ -270,7 +270,7 @@ int do_daemonize(const char *name, const char *pidfile)
>> exit(-1);
>> }
>>
>> - CHK_SYSCALL(logfile = open(fullname, O_WRONLY|O_CREAT|O_APPEND, 0644));
>> + CHK_SYSCALL(logfile = open(fullname, O_WRONLY | O_CREAT | O_APPEND |
>> O_CLOEXEC, 0644));
> Everytime we use O_CLOEXEC, we add in the C file
> #ifndef O_CLOEXEC
> #define O_CLOEXEC 0
> #endif
> we don't need to do that anymore?
> Or I guess we'll see if someone complain when they try to build on an
> ancien version of Linux.
I double checked, and it turns out it was an FD_CLOEXEC, not an
O_CLOEXEC which xl was using, so we don't have a pre-existing example.
Therefore I've re-added this at the top of xl_utils.c
~Andrew
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