linux-kernel - Re: [PATCH bpf-next v3 1/2] bpf: Add bpf_lsm_set_bprm

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Message-ID: <20201117061446.pbszrrezas4wn2kf@kafai-mbp.dhcp.thefacebook.com>
Date:   Mon, 16 Nov 2020 22:14:46 -0800
From:   Martin KaFai Lau <kafai@...com>
To:     KP Singh <kpsingh@...omium.org>
CC:     <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Florent Revest <revest@...omium.org>,
        Brendan Jackman <jackmanb@...omium.org>,
        Pauline Middelink <middelin@...gle.com>
Subject: Re: [PATCH bpf-next v3 1/2] bpf: Add bpf_lsm_set_bprm_opts helper

On Tue, Nov 17, 2020 at 02:13:06AM +0000, KP Singh wrote:
> From: KP Singh <kpsingh@...gle.com>
> 
> The helper allows modification of certain bits on the linux_binprm
> struct starting with the secureexec bit which can be updated using the
> BPF_LSM_F_BPRM_SECUREEXEC flag.
> 
> secureexec can be set by the LSM for privilege gaining executions to set
> the AT_SECURE auxv for glibc.  When set, the dynamic linker disables the
> use of certain environment variables (like LD_PRELOAD).
> 
> Signed-off-by: KP Singh <kpsingh@...gle.com>
Acked-by: Martin KaFai Lau <kafai@...com>