crtxcr/exile.h
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append_syscall_to_bpf(): Improve readability

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Albert S. 2021-12-28 23:04:18 +01:00
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exile.h
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@ -1329,31 +1329,32 @@ static void append_syscall_to_bpf(struct exile_syscall_policy *syscallpolicy, st
for(size_t i = 0; i < syscallpolicy->argfilterscount; i++)
{
filter[*start_index] = syscallpolicy->argfilters[i];
struct sock_filter *current = &filter[*start_index];
__u8 jump_count_next_syscall = next_syscall_pc;
__u8 jump_count_return = jump_count_next_syscall - 1;
if(filter[*start_index].jt == EXILE_SYSCALL_EXIT_BPF_NO_MATCH)
if(current->jt == EXILE_SYSCALL_EXIT_BPF_NO_MATCH)
{
filter[*start_index].jt = jump_count_next_syscall;
current->jt = jump_count_next_syscall;
}
if(filter[*start_index].jt == EXILE_SYSCALL_EXIT_BPF_RETURN)
if(current->jt == EXILE_SYSCALL_EXIT_BPF_RETURN)
{
filter[*start_index].jt = jump_count_return;
current->jt = jump_count_return;
}
if(filter[*start_index].jf == EXILE_SYSCALL_EXIT_BPF_NO_MATCH)
if(current->jf == EXILE_SYSCALL_EXIT_BPF_NO_MATCH)
{
filter[*start_index].jf = jump_count_next_syscall;
current->jf = jump_count_next_syscall;
}
if(filter[*start_index].jf == EXILE_SYSCALL_EXIT_BPF_RETURN)
if(current->jf == EXILE_SYSCALL_EXIT_BPF_RETURN)
{
filter[*start_index].jf = jump_count_return;
current->jf = jump_count_return;
}
if(filter[*start_index].code == return_matching.code && filter[*start_index].k == return_matching.k)
if(current->code == return_matching.code && current->k == return_matching.k)
{
filter[*start_index].k = jump_count_return;
current->k = jump_count_return;
}
if(filter[*start_index].code == return_not_matching.code && filter[*start_index].k == return_not_matching.k)
if(current->code == return_not_matching.code && current->k == return_not_matching.k)
{
filter[*start_index].k = jump_count_next_syscall;
current->k = jump_count_next_syscall;
}
--next_syscall_pc;
++*start_index;