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cpumap: Zero-initialise xdp_rxq_info struct before running XDP program 

When running an XDP program that is attached to a cpumap entry, we don't
initialise the xdp_rxq_info data structure being used in the xdp_buff
that backs the XDP program invocation. Tobias noticed that this leads to
random values being returned as the xdp_md->rx_queue_index value for XDP
programs running in a cpumap.

This means we're basically returning the contents of the uninitialised
memory, which is bad. Fix this by zero-initialising the rxq data
structure before running the XDP program.

Fixes: 9216477449 ("bpf: cpumap: Add the possibility to attach an eBPF program to cpumap")
Reported-by: Tobias Böhm <tobias@aibor.de>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20240305213132.11955-1-toke@redhat.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Toke Høiland-Jørgensen 2024-03-05 22:31:32 +01:00 committed by Martin KaFai Lau
parent 0bfc0336e1
commit 2487007aa3
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/cpumap.c
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@ -178,7 +178,7 @@ static int cpu_map_bpf_prog_run_xdp(struct bpf_cpu_map_entry *rcpu,
void **frames, int n,
struct xdp_cpumap_stats *stats)
{
struct xdp_rxq_info rxq;
struct xdp_rxq_info rxq = {};
struct xdp_buff xdp;
int i, nframes = 0;