Daniel Borkmann e8b56d55a3 net: bpf: arm: make hole-faulting more robust ... Will Deacon pointed out, that the currently used opcode for filling holes, that is 0xe7ffffff, seems not robust enough ... $ echo 0xffffffe7 | xxd -r > test.bin $ arm-linux-gnueabihf-objdump -m arm -D -b binary test.bin ... 0: e7ffffff udf #65535 ; 0xffff ... while for Thumb, it ends up as ... 0: ffff e7ff vqshl.u64 q15, <illegal reg q15.5>, #63 ... which is a bit fragile. The ARM specification defines some *permanently* guaranteed undefined instruction (UDF) space, for example for ARM in ARMv7-AR, section A5.4 and for Thumb in ARMv7-M, section A5.2.6. Similarly, ptrace, kprobes, kgdb, bug and uprobes make use of such instruction as well to trap. Given mentioned section from the specification, we can find such a universe as (where 'x' denotes 'don't care'): ARM: xxxx 0111 1111 xxxx xxxx xxxx 1111 xxxx Thumb: 1101 1110 xxxx xxxx We therefore should use a more robust opcode that fits both. Russell King suggested that we can even reuse a single 32-bit word, that is, 0xe7fddef1 which will fault if executed in ARM *or* Thumb mode as done in f928d4f2a8 ("ARM: poison the vectors page"). That will still hold our requirements: $ echo 0xf1defde7 | xxd -r > test.bin $ arm-unknown-linux-gnueabi-objdump -m arm -D -b binary test.bin ... 0: e7fddef1 udf #56801 ; 0xdde1 $ echo 0xf1defde7f1defde7f1defde7 | xxd -r > test.bin $ arm-unknown-linux-gnueabi-objdump -marm -Mforce-thumb -D -b binary test.bin ... 0: def1 udf #241 ; 0xf1 2: e7fd b.n 0x0 4: def1 udf #241 ; 0xf1 6: e7fd b.n 0x4 8: def1 udf #241 ; 0xf1 a: e7fd b.n 0x8 So on ARM 0xe7fddef1 conforms to the above UDF pattern, and the low 16 bit likewise correspond to UDF in Thumb case. The 0xe7fd part is an unconditional branch back to the UDF instruction. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Mircea Gherzan <mgherzan@gmail.com> Cc: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2014-09-23 12:40:22 -04:00
..
bpf_jit_32.c	net: bpf: arm: make hole-faulting more robust	2014-09-23 12:40:22 -04:00
bpf_jit_32.h	net: bpf: arm: make hole-faulting more robust	2014-09-23 12:40:22 -04:00
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