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aya: adjust bpf programs for big endian

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In aya/src/sys/bpf.rs, there are several simple bpf programs written as
byte arrays. These need to be adjusted to account for big endian.

Signed-off-by: Billy McFall <22157057+Billy99@users.noreply.github.com>
pull/974/head
Billy McFall 2 months ago
parent b513af12e8
commit cd1db86fd4
1 changed files with 50 additions and 0 deletions
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50
aya/src/sys/bpf.rs
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@ -672,6 +672,11 @@ pub(crate) fn is_prog_name_supported() -> bool {
});
u.prog_name = name;
// The fields conforming an encoded basic instruction are stored in the following order:
// opcode:8 src_reg:4 dst_reg:4 offset:16 imm:32 - In little-endian BPF.
// opcode:8 dst_reg:4 src_reg:4 offset:16 imm:32 - In big-endian BPF.
// Multi-byte fields ('imm' and 'offset') are stored using endian order.
// https://www.kernel.org/doc/html/v6.4-rc7/bpf/instruction-set.html#instruction-encoding
let prog: &[u8] = &[
0xb7, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // mov64 r0 = 0
0x95, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // exit
@ -692,6 +697,12 @@ pub(crate) fn is_probe_read_kernel_supported() -> bool {
let mut attr = unsafe { mem::zeroed::<bpf_attr>() };
let u = unsafe { &mut attr.__bindgen_anon_3 };
// The fields conforming an encoded basic instruction are stored in the following order:
// opcode:8 src_reg:4 dst_reg:4 offset:16 imm:32 - In little-endian BPF.
// opcode:8 dst_reg:4 src_reg:4 offset:16 imm:32 - In big-endian BPF.
// Multi-byte fields ('imm' and 'offset') are stored using endian order.
// https://www.kernel.org/doc/html/v6.4-rc7/bpf/instruction-set.html#instruction-encoding
#[cfg(target_endian = "little")]
let prog: &[u8] = &[
0xbf, 0xa1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // r1 = r10
0x07, 0x01, 0x00, 0x00, 0xf8, 0xff, 0xff, 0xff, // r1 -= 8
@ -700,6 +711,15 @@ pub(crate) fn is_probe_read_kernel_supported() -> bool {
0x85, 0x00, 0x00, 0x00, 0x71, 0x00, 0x00, 0x00, // call 113
0x95, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // exit
];
#[cfg(target_endian = "big")]
let prog: &[u8] = &[
0xbf, 0x1a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // r1 = r10
0x07, 0x10, 0x00, 0x00, 0xff, 0xff, 0xff, 0xf8, // r1 -= 8
0xb7, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, // r2 = 8
0xb7, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // r3 = 0
0x85, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x71, // call 113
0x95, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // exit
];
let gpl = b"GPL\0";
u.license = gpl.as_ptr() as u64;
@ -716,6 +736,11 @@ pub(crate) fn is_perf_link_supported() -> bool {
let mut attr = unsafe { mem::zeroed::<bpf_attr>() };
let u = unsafe { &mut attr.__bindgen_anon_3 };
// The fields conforming an encoded basic instruction are stored in the following order:
// opcode:8 src_reg:4 dst_reg:4 offset:16 imm:32 - In little-endian BPF.
// opcode:8 dst_reg:4 src_reg:4 offset:16 imm:32 - In big-endian BPF.
// Multi-byte fields ('imm' and 'offset') are stored using endian order.
// https://www.kernel.org/doc/html/v6.4-rc7/bpf/instruction-set.html#instruction-encoding
let prog: &[u8] = &[
0xb7, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // mov64 r0 = 0
0x95, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // exit
@ -746,6 +771,12 @@ pub(crate) fn is_bpf_global_data_supported() -> bool {
let mut attr = unsafe { mem::zeroed::<bpf_attr>() };
let u = unsafe { &mut attr.__bindgen_anon_3 };
// The fields conforming an encoded basic instruction are stored in the following order:
// opcode:8 src_reg:4 dst_reg:4 offset:16 imm:32 - In little-endian BPF.
// opcode:8 dst_reg:4 src_reg:4 offset:16 imm:32 - In big-endian BPF.
// Multi-byte fields ('imm' and 'offset') are stored using endian order.
// https://www.kernel.org/doc/html/v6.4-rc7/bpf/instruction-set.html#instruction-encoding
#[cfg(target_endian = "little")]
let prog: &[u8] = &[
0x18, 0x21, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // ld_pseudo r1, 0x2, 0x0
0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, //
@ -753,6 +784,14 @@ pub(crate) fn is_bpf_global_data_supported() -> bool {
0xb7, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // mov64 r0 = 0
0x95, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // exit
];
#[cfg(target_endian = "big")]
let prog: &[u8] = &[
0x18, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, // ld_pseudo r1, 0x2, 0x0
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x7a, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2a, // stdw [r1 + 0x0], 0x2a
0xb7, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // mov64 r0 = 0
0x95, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // exit
];
let mut insns = copy_instructions(prog).unwrap();
@ -793,10 +832,21 @@ pub(crate) fn is_bpf_cookie_supported() -> bool {
let mut attr = unsafe { mem::zeroed::<bpf_attr>() };
let u = unsafe { &mut attr.__bindgen_anon_3 };
// The fields conforming an encoded basic instruction are stored in the following order:
// opcode:8 src_reg:4 dst_reg:4 offset:16 imm:32 - In little-endian BPF.
// opcode:8 dst_reg:4 src_reg:4 offset:16 imm:32 - In big-endian BPF.
// Multi-byte fields ('imm' and 'offset') are stored using endian order.
// https://www.kernel.org/doc/html/v6.4-rc7/bpf/instruction-set.html#instruction-encoding
#[cfg(target_endian = "little")]
let prog: &[u8] = &[
0x85, 0x00, 0x00, 0x00, 0xae, 0x00, 0x00, 0x00, // call bpf_get_attach_cookie
0x95, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // exit
];
#[cfg(target_endian = "big")]
let prog: &[u8] = &[
0x85, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xae, // call bpf_get_attach_cookie
0x95, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // exit
];
let gpl = b"GPL\0";
u.license = gpl.as_ptr() as u64;

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