This is the test case taken from
(https://lwn.net/ml/all/cahsh6gs3eh8dfu0wq58c_lf8a4_+o6z456j7bidmcvy2aqo...@mail.gmail.com/)
--- CODE ---
#!/bin/bash
cat > /tmp/x.c << EOF
#include <stdio.h>
#include <seccomp.h>
char *syscalls[] = {
"write",
"exit_group",
};
__attribute__((noinline)) int probed(void)
{
printf("Probed\n");
return 1;
}
void apply_seccomp_filter(char **syscalls, int num_syscalls)
{
scmp_filter_ctx ctx;
ctx = seccomp_init(SCMP_ACT_ERRNO(1));
for (int i = 0; i < num_syscalls; i++) {
seccomp_rule_add(ctx, SCMP_ACT_ALLOW,
seccomp_syscall_resolve_name(syscalls[i]), 0);
}
seccomp_load(ctx);
seccomp_release(ctx);
}
int main(int argc, char *argv[])
{
int num_syscalls = sizeof(syscalls) / sizeof(syscalls[0]);
apply_seccomp_filter(syscalls, num_syscalls);
probed();
return 0;
}
EOF
cat > /tmp/trace.bt << EOF
uretprobe:/tmp/x:probed
{
printf("ret=%d\n", retval);
}
EOF
gcc -o /tmp/x /tmp/x.c -lseccomp
/usr/bin/bpftrace /tmp/trace.bt &
sleep 5 # wait for uretprobe attach
/tmp/x
pkill bpftrace
rm /tmp/x /tmp/x.c /tmp/trace.bt
** Changed in: linux (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2098759
Title:
Processes crash when attaching uretprobes to processes running in
Docker
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