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| author | Andrea Righi <arighi@nvidia.com> | 2024-12-17 20:58:13 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-01-02 10:34:10 +0100 |
| commit | f4ab7d74247b0150547cf909b3f6f24ee85183df (patch) | |
| tree | 7a376307e8f809d6f28cc9983326d15ea9a698cf /kernel/crash_reserve.c | |
| parent | f0f2e5aa56e944cb703c9ccc0ad8c5bbeb3f8874 (diff) | |
| download | linux-f4ab7d74247b0150547cf909b3f6f24ee85183df.tar.gz linux-f4ab7d74247b0150547cf909b3f6f24ee85183df.tar.bz2 linux-f4ab7d74247b0150547cf909b3f6f24ee85183df.zip | |
bpf: Fix bpf_get_smp_processor_id() on !CONFIG_SMP
[ Upstream commit 23579010cf0a12476e96a5f1acdf78a9c5843657 ]
On x86-64 calling bpf_get_smp_processor_id() in a kernel with CONFIG_SMP
disabled can trigger the following bug, as pcpu_hot is unavailable:
[ 8.471774] BUG: unable to handle page fault for address: 00000000936a290c
[ 8.471849] #PF: supervisor read access in kernel mode
[ 8.471881] #PF: error_code(0x0000) - not-present page
Fix by inlining a return 0 in the !CONFIG_SMP case.
Fixes: 1ae6921009e5 ("bpf: inline bpf_get_smp_processor_id() helper")
Signed-off-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241217195813.622568-1-arighi@nvidia.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel/crash_reserve.c')
0 files changed, 0 insertions, 0 deletions