bpf: fix stackmap overflow check in __bpf_get_stackid() #9371
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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. For build_id mode, we use sizeof(struct bpf_stack_build_id) to determine capacity, and for normal mode we use sizeof(u64). Reported-by: [email protected] Closes: https://syzkaller.appspot.com/bug?extid=c9b724fbb41cf2538b7b Tested-by: [email protected] Signed-off-by: Arnaud Lecomte <[email protected]>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=986797 expired. Closing PR. |
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Pull request for series with
subject: bpf: fix stackmap overflow check in __bpf_get_stackid()
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=986662