5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Anton Protopopov <aspsk@xxxxxxxxxxxxx>
[ Upstream commit f91717007217d975aa975ddabd91ae1a107b9bff ]
The struct bpf_fib_lookup is supposed to be of size 64. A recent commit
59b418c7063d ("bpf: Add a check for struct bpf_fib_lookup size") added
a static assertion to check this property so that future changes to the
structure will not accidentally break this assumption.
As it immediately turned out, on some 32-bit arm systems, when AEABI=n,
the total size of the structure was equal to 68, see [1]. This happened
because the bpf_fib_lookup structure contains a union of two 16-bit
fields:
union {
__u16 tot_len;
__u16 mtu_result;
};
which was supposed to compile to a 16-bit-aligned 16-bit field. On the
aforementioned setups it was instead both aligned and padded to 32-bits.
Declare this inner union as __attribute__((packed, aligned(2))) such
that it always is of size 2 and is aligned to 16 bits.
[1] https://lore.kernel.org/all/CA+G9fYtsoP51f-oP_Sp5MOq-Ffv8La2RztNpwvE6+R1VtFiLrw@xxxxxxxxxxxxxx/#t
Reported-by: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>
Fixes: e1850ea9bd9e ("bpf: bpf_fib_lookup return MTU value as output when looked up")
Signed-off-by: Anton Protopopov <aspsk@xxxxxxxxxxxxx>
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@xxxxxxxxx>
Acked-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/bpf/20240403123303.1452184-1-aspsk@xxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
include/uapi/linux/bpf.h | 2 +-
tools/include/uapi/linux/bpf.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index bdb5f2ba769d2..6bfb510656abe 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -6089,7 +6089,7 @@ struct bpf_fib_lookup {
/* output: MTU value */
__u16 mtu_result;
- };
+ } __attribute__((packed, aligned(2)));
/* input: L3 device index for lookup
* output: device index from FIB lookup
*/
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 69d7f0d65b38b..54b8c899d21ce 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -6089,7 +6089,7 @@ struct bpf_fib_lookup {
/* output: MTU value */
__u16 mtu_result;
- };
+ } __attribute__((packed, aligned(2)));
/* input: L3 device index for lookup
* output: device index from FIB lookup
*/
--
2.43.0
