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cppcheck: Avoid errors due to zeroes in bitwise ORs

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Recent versions of cppcheck give warnings if using a bitwise OR (|) where
some of the arguments are zero.  We're triggering these warnings in our
generated seccomp.h header, because BPF_LD and BPF_W are zero-valued.
However putting these defines in makes the generate code clearer, even
though they could be left out without changing the values.  So, add
cppcheck suppressions to the generated code.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2022-09-28 14:33:34 +10:00 committed by Stefano Brivio
parent 0616620805
commit 5beb3472ed
1 changed files with 2 additions and 0 deletions
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seccomp.sh
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@ -26,9 +26,11 @@ HEADER="/* This file was automatically generated by $(basename ${0}) */
# Prefix for each profile: check that 'arch' in seccomp_data is matching
PRE='
struct sock_filter filter_@PROFILE@[] = {
/* cppcheck-suppress badBitmaskCheck */
BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
(offsetof(struct seccomp_data, arch))),
BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, PASST_AUDIT_ARCH, 0, @KILL@),
/* cppcheck-suppress badBitmaskCheck */
BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
(offsetof(struct seccomp_data, nr))),