** Tags added: kernel-daily-bug
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https://bugs.launchpad.net/bugs/2069807
Title:
BPF Filtering issues with 20.04.5/5.4.0-126
Status in Ubuntu:
Invalid
Status in linux package in Ubuntu:
New
Bug description:
Good morning,
we are currently porting an old kernel driver to Linux kernel 5.4.0-126 on
Ubuntu 20.04.5 LTS and noted odd behaviour that doesn't occur with the same
kernel version on Ubuntu 20.04.6 LTS.
The installation is fresh and based on the Ubuntu Server images +
OpenSSH and the generic kernel.
ii linux-headers-5.4.0-126 5.4.0-126.142
all Header files related to Linux kernel version 5.4.0
ii linux-headers-5.4.0-126-generic 5.4.0-126.142
amd64 Linux kernel headers for version 5.4.0 on 64 bit x86 SMP
ii linux-image-5.4.0-126-generic 5.4.0-126.142
amd64 Signed kernel image generic
ii linux-modules-5.4.0-126-generic 5.4.0-126.142
amd64 Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
The driver basically opens a raw socket and configures mac address
filtering based on BPF with sock_setsockopt.
struct sock_filter lsf_code[] = {
{ 0x20, 0, 0, 0x00000008 },
{ 0x15, 0, 3, 0xcc112233 },
{ 0x28, 0, 0, 0x00000006 },
{ 0x15, 0, 1, 0x0000aabb },
{ 0x6, 0, 0, 0x0000ffff },
{ 0x6, 0, 0, 0x00000000 },
};
struct sock_fprog lsf = {
.len = ARRAY_SIZE(lsf_code),
.filter = lsf_code,
};
lsf_code[1].k = ntohl(*((__u32 *)&eci->cfg.dst_ieee[2]));
lsf_code[3].k = ntohl(*((__u32 *)&eci->cfg.dst_ieee[0])) >> 16;
if ((result = kernel_setsockopt(eci->sock, SOL_SOCKET,
SO_ATTACH_FILTER, (char *)&lsf, sizeof(lsf))) < 0) {
PRINTE("eci_open2(%d): attachment of LSF to socket
failed - result %d\n",
eci->dev, result);
return (result);
}
Thank you very much and Best Regards,
Florian Scholz
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