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Fix BPF load errors with 5.10 #3

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Fix BPF load errors with 5.10 #3

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026a62b
Zero on stack data before passing it to bpf_perf_event_output
jsitnicki Mar 8, 2021
b3aaed2
Guard against unbounded access in bpf_probe_read error
jsitnicki Mar 8, 2021
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6 changes: 5 additions & 1 deletion unixdump/unixdump/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -524,7 +524,9 @@ def main():
if (l >= BUFFER_SIZE) {
l = BUFFER_SIZE - 1;
}
bpf_probe_read(entry->buffer, l, base);
if (l < BUFFER_SIZE) {
bpf_probe_read(entry->buffer, l, base);
}
}

static inline struct cmsghdr* cmsg_firsthdr_x(struct msghdr* msg) {
Expand Down Expand Up @@ -595,6 +597,7 @@ def main():

int kprobe__unix_stream_sendmsg(struct pt_regs *ctx, struct socket *sock, struct msghdr *msg){
struct notify_t n;
__builtin_memset(&n, 0, sizeof(n));
n.cpu = bpf_get_smp_processor_id();
n.type = SOCK_STREAM;

Expand Down Expand Up @@ -920,6 +923,7 @@ def main():

int kprobe__unix_dgram_sendmsg(struct pt_regs *ctx, struct socket *sock, struct msghdr *msg){
struct notify_t n;
__builtin_memset(&n, 0, sizeof(n));
n.cpu = bpf_get_smp_processor_id();
n.type = SOCK_DGRAM;

Expand Down