Evolution-X-Devices/kernel_xiaomi_garnet
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

arm64: bpf: Only mitigate cBPF programs loaded by unprivileged users

Browse Source 
[ Upstream commit f300769ead032513a68e4a02e806393402e626f8 ]

Support for eBPF programs loaded by unprivileged users is typically
disabled. This means only cBPF programs need to be mitigated for BHB.

In addition, only mitigate cBPF programs that were loaded by an
unprivileged user. Privileged users can also load the same program
via eBPF, making the mitigation pointless.

Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Pu Lehui <pulehui@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
James Morse
2025-06-07 15:25:20 +00:00
committed by Greg Kroah-Hartman
parent c6a8735d84
commit 038866e01e
1 changed files with 3 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm64/net/bpf_jit_comp.c
View File

@@ -342,6 +342,9 @@ static void __maybe_unused build_bhb_mitigation(struct jit_ctx *ctx)
arm64_get_spectre_v2_state() == SPECTRE_VULNERABLE)
return;
if (capable(CAP_SYS_ADMIN))
return;
if (supports_clearbhb(SCOPE_SYSTEM)) {
emit(aarch64_insn_gen_hint(AARCH64_INSN_HINT_CLEARBHB), ctx);
return;