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Message-Id: <20170515.120431.1588221938554447723.davem@davemloft.net>
Date: Mon, 15 May 2017 12:04:31 -0400 (EDT)
From: David Miller <davem@...emloft.net>
To: daniel@...earbox.net
CC: ast@...com, alexei.starovoitov@...il.com, netdev@...r.kernel.org
Subject: [PATCH v2 1/3] bpf: Use 1<<16 as ceiling for immediate alignment
in verifier.
If we use 1<<31, then sequences like:
R1 = 0
R1 <<= 2
do silly things. Examples of this actually exist in
the MAP tests of test_verifier.c
Update test_align.c expectation strings.
Signed-off-by: David S. Miller <davem@...emloft.net>
---
kernel/bpf/verifier.c | 2 +-
tools/testing/selftests/bpf/test_align.c | 12 ++++++------
2 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 39f2dcb..0f33db0 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -1715,7 +1715,7 @@ static void check_reg_overflow(struct bpf_reg_state *reg)
static u32 calc_align(u32 imm)
{
if (!imm)
- return 1U << 31;
+ return 1U << 16;
return imm - ((imm - 1) & imm);
}
diff --git a/tools/testing/selftests/bpf/test_align.c b/tools/testing/selftests/bpf/test_align.c
index 9644d4e..afaa297 100644
--- a/tools/testing/selftests/bpf/test_align.c
+++ b/tools/testing/selftests/bpf/test_align.c
@@ -235,12 +235,12 @@ static struct bpf_align_test tests[] = {
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.matches = {
- "4: R0=imm0,min_value=0,max_value=0,min_align=2147483648 R1=ctx R2=pkt(id=0,off=0,r=0) R3=pkt_end R5=pkt(id=0,off=0,r=0) R10=fp",
- "5: R0=imm0,min_value=0,max_value=0,min_align=2147483648 R1=ctx R2=pkt(id=0,off=0,r=0) R3=pkt_end R5=pkt(id=0,off=14,r=0) R10=fp",
- "6: R0=imm0,min_value=0,max_value=0,min_align=2147483648 R1=ctx R2=pkt(id=0,off=0,r=0) R3=pkt_end R4=pkt(id=0,off=14,r=0) R5=pkt(id=0,off=14,r=0) R10=fp",
- "10: R0=imm0,min_value=0,max_value=0,min_align=2147483648 R1=ctx R2=pkt(id=0,off=0,r=18) R3=pkt_end R4=inv56 R5=pkt(id=0,off=14,r=18) R10=fp",
- "14: R0=imm0,min_value=0,max_value=0,min_align=2147483648 R1=ctx R2=pkt(id=0,off=0,r=18) R3=pkt_end R4=inv48 R5=pkt(id=0,off=14,r=18) R10=fp",
- "15: R0=imm0,min_value=0,max_value=0,min_align=2147483648 R1=ctx R2=pkt(id=0,off=0,r=18) R3=pkt_end R4=inv48 R5=pkt(id=0,off=14,r=18) R10=fp",
+ "4: R0=imm0,min_value=0,max_value=0,min_align=65536 R1=ctx R2=pkt(id=0,off=0,r=0) R3=pkt_end R5=pkt(id=0,off=0,r=0) R10=fp",
+ "5: R0=imm0,min_value=0,max_value=0,min_align=65536 R1=ctx R2=pkt(id=0,off=0,r=0) R3=pkt_end R5=pkt(id=0,off=14,r=0) R10=fp",
+ "6: R0=imm0,min_value=0,max_value=0,min_align=65536 R1=ctx R2=pkt(id=0,off=0,r=0) R3=pkt_end R4=pkt(id=0,off=14,r=0) R5=pkt(id=0,off=14,r=0) R10=fp",
+ "10: R0=imm0,min_value=0,max_value=0,min_align=65536 R1=ctx R2=pkt(id=0,off=0,r=18) R3=pkt_end R4=inv56 R5=pkt(id=0,off=14,r=18) R10=fp",
+ "14: R0=imm0,min_value=0,max_value=0,min_align=65536 R1=ctx R2=pkt(id=0,off=0,r=18) R3=pkt_end R4=inv48 R5=pkt(id=0,off=14,r=18) R10=fp",
+ "15: R0=imm0,min_value=0,max_value=0,min_align=65536 R1=ctx R2=pkt(id=0,off=0,r=18) R3=pkt_end R4=inv48 R5=pkt(id=0,off=14,r=18) R10=fp",
},
},
{
--
2.1.2.532.g19b5d50
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