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bpf: fix uapi bpf_prog_info fields alignment

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[ Upstream commit 0472301a28 ]

Merge commit 1c8c5a9d38 ("Merge
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next") undid the
fix from commit 36f9814a49 ("bpf: fix uapi hole for 32 bit compat
applications") by taking the gpl_compatible 1-bit field definition from
commit b85fab0e67 ("bpf: Add gpl_compatible flag to struct
bpf_prog_info") as is. That breaks architectures with 16-bit alignment
like m68k. Add 31-bit pad after gpl_compatible to restore alignment of
following fields.

Thanks to Dmitry V. Levin his analysis of this bug history.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Baruch Siach 2019-06-28 07:08:45 +03:00 committed by Greg Kroah-Hartman
parent af3790a46a
commit 7343178ccf
2 changed files with 2 additions and 0 deletions
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1
include/uapi/linux/bpf.h
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@ -2486,6 +2486,7 @@ struct bpf_prog_info {
char name[BPF_OBJ_NAME_LEN];
__u32 ifindex;
__u32 gpl_compatible:1;
__u32 :31; /* alignment pad */
__u64 netns_dev;
__u64 netns_ino;
__u32 nr_jited_ksyms;

1
tools/include/uapi/linux/bpf.h
View file

@ -2484,6 +2484,7 @@ struct bpf_prog_info {
char name[BPF_OBJ_NAME_LEN];
__u32 ifindex;
__u32 gpl_compatible:1;
__u32 :31; /* alignment pad */
__u64 netns_dev;
__u64 netns_ino;
__u32 nr_jited_ksyms;