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There were spurious unaligned access warnings when calling BPF code.
Sometimes, the warnings were triggered with any incoming packet, making
the machine hard to use.
The reason for the warnings is this: on parisc64, pointers to functions
are not really pointers to functions, they are pointers to 16-byte
descriptor. The first 8 bytes of the descriptor is a pointer to the
function and the next 8 bytes of the descriptor is the content of the
"dp" register. This descriptor is generated in the function
bpf_jit_build_prologue.
The problem is that the function bpf_int_jit_compile advertises 4-byte
alignment when calling bpf_jit_binary_alloc, bpf_jit_binary_alloc
randomizes the returned array and if the array happens to be not aligned
on 8-byte boundary, the descriptor generated in bpf_jit_build_prologue is
also not aligned and this triggers the unaligned access warning.
Fix this by advertising 8-byte alignment on parisc64 when calling
bpf_jit_binary_alloc.
Signed-off-by: Mikulas Patocka <[email protected]>
Cc: [email protected]
Signed-off-by: Helge Deller <[email protected]>
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bpf_jit_binary_lock_ro()
set_memory_rox() can fail, leaving memory unprotected.
Check return and bail out when bpf_jit_binary_lock_ro() returns
an error.
Link: https://github.com/KSPP/linux/issues/7
Signed-off-by: Christophe Leroy <[email protected]>
Cc: [email protected] <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: Puranjay Mohan <[email protected]>
Reviewed-by: Ilya Leoshkevich <[email protected]> # s390x
Acked-by: Tiezhu Yang <[email protected]> # LoongArch
Reviewed-by: Johan Almbladh <[email protected]> # MIPS Part
Message-ID: <036b6393f23a2032ce75a1c92220b2afcb798d5d.1709850515.git.christophe.leroy@csgroup.eu>
Signed-off-by: Alexei Starovoitov <[email protected]>
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Signed-off-by: Helge Deller <[email protected]>
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Signed-off-by: Helge Deller <[email protected]>
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Signed-off-by: Helge Deller <[email protected]>
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