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

[Stefan Bader]

On 17.03.21 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++
> 
> [Where problems could occur]
> Released in
> linux-3.16.y
> linux-3.2.y
> linux-4.1.y
> 
> 
Acked-by: Stefan Bader <stefan.bader at canonical.com>

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