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| author | Kui-Feng Lee <thinker.li@gmail.com> | 2023-05-02 11:14:18 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-27 08:56:48 +0200 |
| commit | c7f54ef43499f9b10771459058f1361d37b3e3e1 (patch) | |
| tree | 643bdaaa27ef5f14ed6879d82e2cb2b88de77f11 /kernel | |
| parent | 32ca096e712a78b2f0d2e48d33dc0caaba9f9866 (diff) | |
| download | linux-c7f54ef43499f9b10771459058f1361d37b3e3e1.tar.gz linux-c7f54ef43499f9b10771459058f1361d37b3e3e1.tar.bz2 linux-c7f54ef43499f9b10771459058f1361d37b3e3e1.zip | |
bpf: Print a warning only if writing to unprivileged_bpf_disabled.
[ Upstream commit fedf99200ab086c42a572fca1d7266b06cdc3e3f ]
Only print the warning message if you are writing to
"/proc/sys/kernel/unprivileged_bpf_disabled".
The kernel may print an annoying warning when you read
"/proc/sys/kernel/unprivileged_bpf_disabled" saying
WARNING: Unprivileged eBPF is enabled with eIBRS on, data leaks possible
via Spectre v2 BHB attacks!
However, this message is only meaningful when the feature is
disabled or enabled.
Signed-off-by: Kui-Feng Lee <kuifeng@meta.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20230502181418.308479-1-kuifeng@meta.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/syscall.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index f1c8733f76b8..5524fcf6fb2a 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -5394,7 +5394,8 @@ static int bpf_unpriv_handler(struct ctl_table *table, int write, *(int *)table->data = unpriv_enable; } - unpriv_ebpf_notify(unpriv_enable); + if (write) + unpriv_ebpf_notify(unpriv_enable); return ret; } |