SymbX/systemd
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

bpf: fix device type filter

Browse Source 
On big endian arches, we were taking the wrong half-word, so the check
was giving bogus results.

https://bugzilla.redhat.com/show_bug.cgi?id=1769148.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
2019-11-11 14:55:57 +01:00
parent 786cce0099
commit 415fe5ec7d
1 changed files with 2 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/core/bpf-devices.c
+2 -1
View File
@@ -125,8 +125,9 @@ static int bpf_prog_whitelist_class(BPFProgram *prog, int type, const char *acc)
int bpf_devices_cgroup_init(BPFProgram **ret, CGroupDevicePolicy policy, bool whitelist) {
const struct bpf_insn pre_insn[] = {
/* load device type to r2 */
BPF_LDX_MEM(BPF_H, BPF_REG_2, BPF_REG_1,
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
offsetof(struct bpf_cgroup_dev_ctx, access_type)),
BPF_ALU32_IMM(BPF_AND, BPF_REG_2, 0xFFFF),
/* load access type to r3 */
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,