ACK: [PATCH 0/1] [SRU] [xenial/linux] CVE-2015-1350

[Krzysztof Kozlowski]

On 17/03/2021 18:16, Tim Gardner wrote:
> [Impact]
> The VFS subsystem in the Linux kernel 3.x provides an incomplete set of
> requirements for setattr operations that underspecifies removing extended
> privilege attributes, which allows local users to cause a denial of service
> (capability stripping) via a failed invocation of a system call, as demonstrated
> by using chown to remove a capability from the ping or Wireshark dumpcap program.
> 
> From the Ubuntu security team:
> Ben Harris discovered that the Linux kernel would strip extended privilege
> attributes of files when performing a failed unprivileged system call. A
> local attacker could use this to cause a denial of service.
> 
> The fix commit 030b533c4fd4d2ec3402363323de4bb2983c9cee "fs: Avoid premature
> clearing of capabilities" required 3 scaffold patches. I used the stable
> updates from linux-4.1.y as a guide.
> 
> [Test Plan]
> I've run passes with iozone and bonnie++

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski at canonical.com>


Best regards,
Krzysztof