Commit 91b4db53 authored by Ilya Leoshkevich's avatar Ilya Leoshkevich Committed by Daniel Borkmann

s390/bpf: use 32-bit index for tail calls

"p runtime/jit: pass > 32bit index to tail_call" fails when
bpf_jit_enable=1, because the tail call is not executed.

This in turn is because the generated code assumes index is 64-bit,
while it must be 32-bit, and as a result prog array bounds check fails,
while it should pass. Even if bounds check would have passed, the code
that follows uses 64-bit index to compute prog array offset.

Fix by using clrj instead of clgrj for comparing index with array size,
and also by using llgfr for truncating index to 32 bits before using it
to compute prog array offset.

Fixes: 6651ee07 ("s390/bpf: implement bpf_tail_call() helper")
Reported-by: default avatarYauheni Kaliuta <yauheni.kaliuta@redhat.com>
Acked-by: default avatarVasily Gorbik <gor@linux.ibm.com>
Signed-off-by: default avatarIlya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent bb2d267c
......@@ -1049,8 +1049,8 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, int i
/* llgf %w1,map.max_entries(%b2) */
EMIT6_DISP_LH(0xe3000000, 0x0016, REG_W1, REG_0, BPF_REG_2,
offsetof(struct bpf_array, map.max_entries));
/* clgrj %b3,%w1,0xa,label0: if %b3 >= %w1 goto out */
EMIT6_PCREL_LABEL(0xec000000, 0x0065, BPF_REG_3,
/* clrj %b3,%w1,0xa,label0: if (u32)%b3 >= (u32)%w1 goto out */
EMIT6_PCREL_LABEL(0xec000000, 0x0077, BPF_REG_3,
REG_W1, 0, 0xa);
/*
......@@ -1076,8 +1076,10 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, int i
* goto out;
*/
/* sllg %r1,%b3,3: %r1 = index * 8 */
EMIT6_DISP_LH(0xeb000000, 0x000d, REG_1, BPF_REG_3, REG_0, 3);
/* llgfr %r1,%b3: %r1 = (u32) index */
EMIT4(0xb9160000, REG_1, BPF_REG_3);
/* sllg %r1,%r1,3: %r1 *= 8 */
EMIT6_DISP_LH(0xeb000000, 0x000d, REG_1, REG_1, REG_0, 3);
/* lg %r1,prog(%b2,%r1) */
EMIT6_DISP_LH(0xe3000000, 0x0004, REG_1, BPF_REG_2,
REG_1, offsetof(struct bpf_array, ptrs));
......
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