bpf: refactor max_depth computation in bpf_get_stack() #9732
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A new helper function stack_map_calculate_max_depth() that computes the max depth for a stackmap. Acked-by: Yonghong Song <[email protected]> Acked-by: Song Liu <[email protected]> Signed-off-by: Arnaud Lecomte <[email protected]>
Clean-up bounds checking for trace->nr in __bpf_get_stack by limiting it only to max_depth. Acked-by: Song Liu <[email protected]> Cc: Song Liu <[email protected]> Signed-off-by: Arnaud Lecomte <[email protected]>
Syzkaller reported a KASAN slab-out-of-bounds write in __bpf_get_stackid() when copying stack trace data. The issue occurs when the perf trace contains more stack entries than the stack map bucket can hold, leading to an out-of-bounds write in the bucket's data array. Reported-by: [email protected] Closes: https://syzkaller.appspot.com/bug?extid=c9b724fbb41cf2538b7b Fixes: ee2a098 ("bpf: Adjust BPF stack helper functions to accommodate skip > 0") Acked-by: Yonghong Song <[email protected]> Acked-by: Song Liu <[email protected]> Signed-off-by: Arnaud Lecomte <[email protected]>
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Pull request for series with
subject: bpf: refactor max_depth computation in bpf_get_stack()
version: 9
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1001977