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185a4caeecabc150106deda1da170b09f2ad803f
linux/tools/testing/selftests/bpf/progs/verifier_subreg.c
Eduard Zingerman bbc6310855 bpf: replace min/max fields with struct cnum{32,64} 
Replace eight independent s64, u64, s32, u32 min/max fields in
bpf_reg_state with two circular number fields:
- cnum64 for a unified signed/unsigned 64-bit range tracking;
- cnum32 for a unified signed/unsigned 32-bit range tracking.
Each cnum represents a range as a single arc on the circular number
line (base + size), from which signed and unsigned bounds are derived
on demand via accessor functions introduced in the preceding commit.

Notable changes:
- Signed<->unsigned deductions in __reg_deduce_bounds() are removed.
- 64<->32 bit deductions are replaced with:
  - reg->r32 = cnum32_intersect(reg->r32, cnum32_from_cnum64(reg->r64));
    this is functionally equivalent to the old code.
  - reg->r64 = cnum64_cnum32_intersect(reg->r64, reg->r32);
    this handles a few additional cases, see commit message for
    "bpf: representation and basic operations on circular numbers".
- regs_refine_cond_op() now computes results in terms of operations on
  sets, e.g. for JNE:

    /* Complement of the range [val, val] as cnum64. */
    lo = (struct cnum64){ val + 1, U64_MAX - 1 };
    reg1->r64 = cnum64_intersect(reg1->r64, lo);

- For add, sub operations on scalars replace explicit bounds
  computations with cnum{32,64}_{add,negate}.
- For add, sub operations on pointers deduplicate with arithmetic
  operations on scalars and use cnum{32,64}_{add,negate}.
- For and, or, xor operations on scalars remove explicit signed bounds
  computations.
- range_bounds_violation() reduces to checking cnum_is_empty().
- const_tnum_range_mismatch() reduces to checking cnum_is_const().

Selftest adjustments: a few existing tests are updated because a
single cnum arc cannot always represent what the old system expressed
as the intersection of independent signed and unsigned ranges.
For example, if the old system tracked u64=[0, U64_MAX-U32_MAX+2] and
s64=[S64_MIN+2, 2] independently, their intersection is a tight
two-point set. A single cnum must pick the shorter arc, losing the
other constraint. These cases are documented with comments in the
adjusted tests.

reg_bounds.c is updated with logic similar to
cnum64_cnum32_intersect(). Instead of using cnums it inspects
intersection between 'b' and first / last / next-after-first /
previous-before-last sub-ranges of 'a'.

reg_bounds.c is also updated to skip test cases that rely
in signed and unsigned ranges intersecting in two intervals,
as such cases are not representable by a single cnum.
The following "crafted" test cases are affected:
- reg_bounds_crafted/(s64)[0xffffffffffff8000; 0x7fff] (u32)<op> [0; 0x1f]
- reg_bounds_crafted/(s64)[0; 0x1f] (u32)<op> [0xffffffffffffff80; 0x7f]
- reg_bounds_crafted/(s64)[0xffffffffffffff80; 0x7f] (u32)<op> [0; 0x1f]
- reg_bounds_crafted/(u64)[0; 1] (s32)<op> [1; 2147483648]
- reg_bounds_crafted/(u64)[1; 2147483648] (s32)<op> [0; 1]
- reg_bounds_crafted/(u64)[0; 0xffffffff00000000] (s64)<op> 0
- reg_bounds_crafted/(u64)0 (s64)<op> [0; 0xffffffff00000000]
- reg_bounds_crafted/(u64)[0; 0xffffffff00000000] (s32)<op> 0
- reg_bounds_crafted/(u64)0 (s32)<op> [0; 0xffffffff00000000]
- reg_bounds_crafted/(s64)[S64_MIN; 0] (u64)<op> S64_MIN
- reg_bounds_crafted/(s64)S64_MIN (u64)<op> [S64_MIN; 0]
- reg_bounds_crafted/(s32)[S32_MIN; 0] (u32)<op> S32_MIN
- reg_bounds_crafted/(s32)S32_MIN (u32)<op> [S32_MIN; 0]
- reg_bounds_crafted/(s64)[0; 0x1f] (u32)<op> [0xffffffff80000000; 0x7fffffff]
- reg_bounds_crafted/(s64)[0xffffffff80000000; 0x7fffffff] (u32)<op> [0; 0x1f]
- reg_bounds_crafted/(s64)[0; 0x1f] (u32)<op> [0xffffffffffff8000; 0x7fff]

As well as some reg_bounds_roand_{consts,ranges}_A_B, where A and B
differ in sign domain.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260424-cnums-everywhere-rfc-v1-v3-3-ca434b39a486@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2026-04-24 18:14:18 -07:00

994 lines
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// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/subreg.c */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
/* This file contains sub-register zero extension checks for insns defining
* sub-registers, meaning:
* - All insns under BPF_ALU class. Their BPF_ALU32 variants or narrow width
* forms (BPF_END) could define sub-registers.
* - Narrow direct loads, BPF_B/H/W | BPF_LDX.
* - BPF_LD is not exposed to JIT back-ends, so no need for testing.
*
* "get_prandom_u32" is used to initialize low 32-bit of some registers to
* prevent potential optimizations done by verifier or JIT back-ends which could
* optimize register back into constant when range info shows one register is a
* constant.
*/
SEC("socket")
__description("add32 reg zero extend check")
__success __success_unpriv __retval(0)
__naked void add32_reg_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = r0; \
r0 = 0x100000000 ll; \
w0 += w1; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("add32 imm zero extend check")
__success __success_unpriv __retval(0)
__naked void add32_imm_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
/* An insn could have no effect on the low 32-bit, for example:\
* a = a + 0 \
* a = a | 0 \
* a = a & -1 \
* But, they should still zero high 32-bit. \
*/ \
w0 += 0; \
r0 >>= 32; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 += -2; \
r0 >>= 32; \
r0 |= r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("sub32 reg zero extend check")
__success __success_unpriv __retval(0)
__naked void sub32_reg_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = r0; \
r0 = 0x1ffffffff ll; \
w0 -= w1; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("sub32 imm zero extend check")
__success __success_unpriv __retval(0)
__naked void sub32_imm_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 -= 0; \
r0 >>= 32; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 -= 1; \
r0 >>= 32; \
r0 |= r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("mul32 reg zero extend check")
__success __success_unpriv __retval(0)
__naked void mul32_reg_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = r0; \
r0 = 0x100000001 ll; \
w0 *= w1; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("mul32 imm zero extend check")
__success __success_unpriv __retval(0)
__naked void mul32_imm_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 *= 1; \
r0 >>= 32; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 *= -1; \
r0 >>= 32; \
r0 |= r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("div32 reg zero extend check")
__success __success_unpriv __retval(0)
__naked void div32_reg_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = r0; \
r0 = -1; \
w0 /= w1; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("div32 imm zero extend check")
__success __success_unpriv __retval(0)
__naked void div32_imm_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 /= 1; \
r0 >>= 32; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 /= 2; \
r0 >>= 32; \
r0 |= r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("or32 reg zero extend check")
__success __success_unpriv __retval(0)
__naked void or32_reg_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = r0; \
r0 = 0x100000001 ll; \
w0 |= w1; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("or32 imm zero extend check")
__success __success_unpriv __retval(0)
__naked void or32_imm_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 |= 0; \
r0 >>= 32; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 |= 1; \
r0 >>= 32; \
r0 |= r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("and32 reg zero extend check")
__success __success_unpriv __retval(0)
__naked void and32_reg_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x100000000 ll; \
r1 |= r0; \
r0 = 0x1ffffffff ll; \
w0 &= w1; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("and32 imm zero extend check")
__success __success_unpriv __retval(0)
__naked void and32_imm_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 &= -1; \
r0 >>= 32; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 &= -2; \
r0 >>= 32; \
r0 |= r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("lsh32 reg zero extend check")
__success __success_unpriv __retval(0)
__naked void lsh32_reg_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x100000000 ll; \
r0 |= r1; \
r1 = 1; \
w0 <<= w1; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("lsh32 imm zero extend check")
__success __success_unpriv __retval(0)
__naked void lsh32_imm_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 <<= 0; \
r0 >>= 32; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 <<= 1; \
r0 >>= 32; \
r0 |= r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("rsh32 reg zero extend check")
__success __success_unpriv __retval(0)
__naked void rsh32_reg_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
r1 = 1; \
w0 >>= w1; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("rsh32 imm zero extend check")
__success __success_unpriv __retval(0)
__naked void rsh32_imm_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 >>= 0; \
r0 >>= 32; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 >>= 1; \
r0 >>= 32; \
r0 |= r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("neg32 reg zero extend check")
__success __success_unpriv __retval(0)
__naked void neg32_reg_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 = -w0; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("mod32 reg zero extend check")
__success __success_unpriv __retval(0)
__naked void mod32_reg_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = r0; \
r0 = -1; \
w0 %%= w1; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("mod32 imm zero extend check")
__success __success_unpriv __retval(0)
__naked void mod32_imm_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 %%= 1; \
r0 >>= 32; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 %%= 2; \
r0 >>= 32; \
r0 |= r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("xor32 reg zero extend check")
__success __success_unpriv __retval(0)
__naked void xor32_reg_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = r0; \
r0 = 0x100000000 ll; \
w0 ^= w1; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("xor32 imm zero extend check")
__success __success_unpriv __retval(0)
__naked void xor32_imm_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 ^= 1; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("mov32 reg zero extend check")
__success __success_unpriv __retval(0)
__naked void mov32_reg_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x100000000 ll; \
r1 |= r0; \
r0 = 0x100000000 ll; \
w0 = w1; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("mov32 imm zero extend check")
__success __success_unpriv __retval(0)
__naked void mov32_imm_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 = 0; \
r0 >>= 32; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 = 1; \
r0 >>= 32; \
r0 |= r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("arsh32 reg zero extend check")
__success __success_unpriv __retval(0)
__naked void arsh32_reg_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
r1 = 1; \
w0 s>>= w1; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("arsh32 imm zero extend check")
__success __success_unpriv __retval(0)
__naked void arsh32_imm_zero_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 s>>= 0; \
r0 >>= 32; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w0 s>>= 1; \
r0 >>= 32; \
r0 |= r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("arsh32 imm sign positive extend check")
__success __retval(0)
__log_level(2)
__msg("2: (57) r6 &= 4095 ; R6=scalar(smin=smin32=0,smax=umax=smax32=umax32=4095,var_off=(0x0; 0xfff))")
__msg("3: (67) r6 <<= 32 ; R6=scalar(smin=smin32=0,smax=umax=0xfff00000000,smax32=umax32=0,var_off=(0x0; 0xfff00000000))")
__msg("4: (c7) r6 s>>= 32 ; R6=scalar(smin=smin32=0,smax=umax=smax32=umax32=4095,var_off=(0x0; 0xfff))")
__naked void arsh32_imm_sign_extend_positive_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r6 = r0; \
r6 &= 4095; \
r6 <<= 32; \
r6 s>>= 32; \
r0 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("arsh32 imm sign negative extend check")
__success __retval(0)
__log_level(2)
__msg("3: (17) r6 -= 4095 ; R6=scalar(smin=smin32=-4095,smax=smax32=0)")
__msg("4: (67) r6 <<= 32 ; R6=scalar(smin=0xfffff00100000000,smax=smax32=umax32=0,smin32=0,var_off=(0x0; 0xffffffff00000000))")
/* represents shorter of signed / unsigned 64-bit ranges */
__msg("5: (c7) r6 s>>= 32 ; R6=scalar(smin=smin32=-4095,smax=smax32=0)")
__naked void arsh32_imm_sign_extend_negative_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r6 = r0; \
r6 &= 4095; \
r6 -= 4095; \
r6 <<= 32; \
r6 s>>= 32; \
r0 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("arsh32 imm sign extend check")
__success __retval(0)
__log_level(2)
__msg("3: (17) r6 -= 2047 ; R6=scalar(smin=smin32=-2047,smax=smax32=2048)")
__msg("4: (67) r6 <<= 32 ; R6=scalar(smin=0xfffff80100000000,smax=0x80000000000,smin32=0,smax32=umax32=0,var_off=(0x0; 0xffffffff00000000))")
/* represents shorter of signed / unsigned 64-bit ranges */
__msg("5: (c7) r6 s>>= 32 ; R6=scalar(smin=smin32=-2047,smax=smax32=2048)")
__naked void arsh32_imm_sign_extend_check(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r6 = r0; \
r6 &= 4095; \
r6 -= 2047; \
r6 <<= 32; \
r6 s>>= 32; \
r0 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("end16 (to_le) reg zero extend check")
__success __success_unpriv __retval(0)
__naked void le_reg_zero_extend_check_1(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r6 = r0; \
r6 <<= 32; \
call %[bpf_get_prandom_u32]; \
r0 |= r6; \
r0 = le16 r0; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("end32 (to_le) reg zero extend check")
__success __success_unpriv __retval(0)
__naked void le_reg_zero_extend_check_2(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r6 = r0; \
r6 <<= 32; \
call %[bpf_get_prandom_u32]; \
r0 |= r6; \
r0 = le32 r0; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("end16 (to_be) reg zero extend check")
__success __success_unpriv __retval(0)
__naked void be_reg_zero_extend_check_1(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r6 = r0; \
r6 <<= 32; \
call %[bpf_get_prandom_u32]; \
r0 |= r6; \
r0 = be16 r0; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("end32 (to_be) reg zero extend check")
__success __success_unpriv __retval(0)
__naked void be_reg_zero_extend_check_2(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r6 = r0; \
r6 <<= 32; \
call %[bpf_get_prandom_u32]; \
r0 |= r6; \
r0 = be32 r0; \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("ldx_b zero extend check")
__success __success_unpriv __retval(0)
__naked void ldx_b_zero_extend_check(void)
{
asm volatile (" \
r6 = r10; \
r6 += -4; \
r7 = 0xfaceb00c; \
*(u32*)(r6 + 0) = r7; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
r0 = *(u8*)(r6 + 0); \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("ldx_h zero extend check")
__success __success_unpriv __retval(0)
__naked void ldx_h_zero_extend_check(void)
{
asm volatile (" \
r6 = r10; \
r6 += -4; \
r7 = 0xfaceb00c; \
*(u32*)(r6 + 0) = r7; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
r0 = *(u16*)(r6 + 0); \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("ldx_w zero extend check")
__success __success_unpriv __retval(0)
__naked void ldx_w_zero_extend_check(void)
{
asm volatile (" \
r6 = r10; \
r6 += -4; \
r7 = 0xfaceb00c; \
*(u32*)(r6 + 0) = r7; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
r0 = *(u32*)(r6 + 0); \
r0 >>= 32; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__success __success_unpriv __retval(0)
__naked void arsh_31_and(void)
{
/* Below is what LLVM generates in cilium's bpf_wiregard.o */
asm volatile (" \
call %[bpf_get_prandom_u32]; \
w2 = w0; \
w2 s>>= 31; \
w2 &= -134; /* w2 becomes 0 or -134 */ \
if w2 s> -1 goto +2; \
/* Branch always taken because w2 = -134 */ \
if w2 != -136 goto +1; \
w0 /= 0; \
w0 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__success __success_unpriv __retval(0)
__naked void arsh_63_and(void)
{
/* Copy of arsh_31 with s/w/r/ */
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r2 = r0; \
r2 <<= 32; \
r2 s>>= 63; \
r2 &= -134; \
if r2 s> -1 goto +2; \
/* Branch always taken because w2 = -134 */ \
if r2 != -136 goto +1; \
r0 /= 0; \
r0 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__success __success_unpriv __retval(0)
__naked void arsh_31_or(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
w2 = w0; \
w2 s>>= 31; \
w2 |= 134; /* w2 becomes -1 or 134 */ \
if w2 s> -1 goto +2; \
/* Branch always taken because w2 = -1 */ \
if w2 == -1 goto +1; \
w0 /= 0; \
w0 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__success __success_unpriv __retval(0)
__naked void arsh_63_or(void)
{
/* Copy of arsh_31 with s/w/r/ */
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r2 = r0; \
r2 <<= 32; \
r2 s>>= 63; \
r2 |= 134; /* r2 becomes -1 or 134 */ \
if r2 s> -1 goto +2; \
/* Branch always taken because w2 = -1 */ \
if r2 == -1 goto +1; \
r0 /= 0; \
r0 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__success __retval(42)
__naked void arsh32_imm1_value(void)
{
asm volatile (" \
r0 = 42; \
r1 = -2147483648; \
w1 s>>= 1; /* r1 = 0xC0000000 */ \
r2 = 0xC0000000 ll; \
if r1 == r2 goto l0_%=; \
r0 /= 0; /* unreachable */ \
l0_%=: exit; \
" :
:
: __clobber_all);
}
SEC("socket")
__success __retval(1)
__naked void lsh32_reg0_zero_extend_check(void)
{
asm volatile (" \
r6 = 1; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w1 = 0; \
w0 <<= w1; /* reg shift by 0 */ \
r0 >>= 32; /* must be 0 */ \
if r0 == 0 goto l0_%=; \
r6 /= 0; /* unreachable */ \
l0_%=: r0 = r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__success __retval(1)
__naked void rsh32_reg0_zero_extend_check(void)
{
asm volatile (" \
r6 = 1; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w1 = 0; \
w0 >>= w1; /* reg rsh by 0 */ \
r0 >>= 32; /* must be 0 */ \
if r0 == 0 goto l0_%=; \
r6 /= 0; /* unreachable */ \
l0_%=: r0 = r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__success __retval(1)
__naked void arsh32_reg0_zero_extend_check(void)
{
asm volatile (" \
r6 = 1; \
call %[bpf_get_prandom_u32]; \
r1 = 0x1000000000 ll; \
r0 |= r1; \
w1 = 0; \
w0 s>>= w1; /* reg arsh by 0 */ \
r0 >>= 32; /* must be 0 */ \
if r0 == 0 goto l0_%=; \
r6 /= 0; /* unreachable */ \
l0_%=: r0 = r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__success __retval(42)
__naked void lsh32_imm31_value(void)
{
asm volatile (" \
r0 = 42; \
r1 = 1; \
w1 <<= 31; /* r1 = 0x80000000 */ \
r2 = 0x80000000 ll; \
if r1 == r2 goto l0_%=; \
r0 /= 0; /* unreachable */ \
l0_%=: exit; \
" :
:
: __clobber_all);
}
SEC("socket")
__success __retval(42)
__naked void rsh32_imm31_value(void)
{
asm volatile (" \
r0 = 42; \
r1 = -2147483648; /* 0x80000000 */ \
w1 >>= 31; /* r1 = 1 */ \
if r1 == 1 goto l0_%=; \
r0 /= 0; /* unreachable */ \
l0_%=: exit; \
" :
:
: __clobber_all);
}
SEC("socket")
__success __retval(42)
__naked void arsh32_imm31_value(void)
{
asm volatile (" \
r0 = 42; \
r1 = -2147483648; /* 0x80000000 */ \
w1 s>>= 31; /* r1 = 0xFFFFFFFF */ \
r2 = 0xFFFFFFFF ll; \
if r1 == r2 goto l0_%=; \
r0 /= 0; /* unreachable */ \
l0_%=: exit; \
" :
:
: __clobber_all);
}
SEC("socket")
__success __retval(1)
__naked void lsh32_unknown_precise_bounds(void)
{
asm volatile (" \
r6 = 1; \
call %[bpf_get_prandom_u32]; \
w0 &= 3; /* u32: [0, 3] */ \
w0 <<= 1; /* u32: [0, 6] */ \
if w0 < 7 goto l0_%=; \
r6 /= 0; /* unreachable */ \
l0_%=: r0 = r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__success __retval(1)
__naked void rsh32_unknown_bounds(void)
{
asm volatile (" \
r6 = 1; \
call %[bpf_get_prandom_u32]; \
w0 >>= 28; /* u32: [0, 15] */ \
if w0 < 16 goto l0_%=; \
r6 /= 0; /* unreachable */ \
l0_%=: r0 = r6; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
char _license[] SEC("license") = "GPL";
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