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UPSTREAM: bpf: Switch BPF probe insns to bpf_probe_read_kernel

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Commit 2a02759ef5f8 ("bpf: Add support for BTF pointers to interpreter")
explicitly states that the pointer to BTF object is a pointer to a kernel
object or NULL. Therefore we should also switch to using the strict kernel
probe helper which is restricted to kernel addresses only when architectures
have non-overlapping address spaces.

Change-Id: I75c8c80b0d7cc2281b3fd2235d5553721cbb0382
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/d2b90827837685424a4b8008dfe0460558abfada.1572649915.git.daniel@iogearbox.net
This commit is contained in:
Daniel Borkmann 2019-11-02 00:18:00 +01:00 • committed by basamaryan
commit 1a82757897
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GPG key ID: 210D5384FB2A5885
1 changed files with 5 additions and 4 deletions
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9
kernel/bpf/core.c
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@ -1326,11 +1326,12 @@ bool bpf_opcode_in_insntable(u8 code)
}
#ifndef CONFIG_BPF_JIT_ALWAYS_ON
u64 __weak bpf_probe_read(void * dst, u32 size, const void * unsafe_ptr)
u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr)
{
memset(dst, 0, size);
return -EFAULT;
}
/**
* __bpf_prog_run - run eBPF program on a given context
* @regs: is the array of MAX_BPF_EXT_REG eBPF pseudo-registers
@ -1624,9 +1625,9 @@ out:
LDST(W, u32)
LDST(DW, u64)
#undef LDST
#define LDX_PROBE(SIZEOP, SIZE) \
LDX_PROBE_MEM_##SIZEOP: \
bpf_probe_read(&DST, SIZE, (const void *)(long) SRC); \
#define LDX_PROBE(SIZEOP, SIZE) \
LDX_PROBE_MEM_##SIZEOP: \
bpf_probe_read_kernel(&DST, SIZE, (const void *)(long) SRC); \
CONT;
LDX_PROBE(B, 1)
LDX_PROBE(H, 2)