selftests/bpf: Test packet range of pointers sharing an idgrafted

Add tests where two packet pointers share an id and tightening one
pointer's umax from its var_off would put it less than their constant
distance from the other's umax: with an index & 0x38 capped at 50, the
base pointer keeps umax 50, so the pointer 8 bytes further on must keep
umax 58, even though its known bits allow at most 56.

These refused a valid program or accepted an out-of-bounds access before
the fix:

- check the advanced copy, load through the base: valid, was refused;
- check the base, load the byte at base + 1 through a copy advanced by
  8: was accepted;
- check base + 4, load 4 bytes at base + 2 through base + 8: reads two
  bytes past the checked range, was accepted;
- the same as the second with data_meta pointers checked against data:
  was accepted.

These pass with and without the fix and cover nearby paths:

- subtract an unknown scalar from a checked pointer and load below it
  (the range is kept across a new id);
- reach a load through two paths whose checks cover 8 and 7 bytes after
  the loaded pointer; the second path must not be pruned by the first;
- spill a copy of a pointer, check the pointer, fill the copy and load
  one byte past the checked range: the load is refused, and the copy
  has the range of the check.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20261001145255.855630-2-alexei.starovoitov@gmail.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/include/dt-bindings/clock/lpc32xx-clock.h b/include/dt-bindings/clock/lpc32xx-clock.h
new file mode 100644
index 000000000..e624d3a52
--- /dev/null
+++ b/include/dt-bindings/clock/lpc32xx-clock.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2015 Vladimir Zapolskiy <vz@mleia.com>
+ *
+ * This code is released using a dual license strategy: BSD/GPL
+ * You can choose the licence that better fits your requirements.
+ *
+ * Released under the terms of 3-clause BSD License
+ * Released under the terms of GNU General Public License Version 2.0
+ *
+ */
+
+#ifndef __DT_BINDINGS_LPC32XX_CLOCK_H
+#define __DT_BINDINGS_LPC32XX_CLOCK_H
+
+/* LPC32XX System Control Block clocks */
+#define LPC32XX_CLK_RTC		1
+#define LPC32XX_CLK_DMA		2
+#define LPC32XX_CLK_MLC		3
+#define LPC32XX_CLK_SLC		4
+#define LPC32XX_CLK_LCD		5
+#define LPC32XX_CLK_MAC		6
+#define LPC32XX_CLK_SD		7
+#define LPC32XX_CLK_DDRAM	8
+#define LPC32XX_CLK_SSP0	9
+#define LPC32XX_CLK_SSP1	10
+#define LPC32XX_CLK_UART3	11
+#define LPC32XX_CLK_UART4	12
+#define LPC32XX_CLK_UART5	13
+#define LPC32XX_CLK_UART6	14
+#define LPC32XX_CLK_IRDA	15
+#define LPC32XX_CLK_I2C1	16
+#define LPC32XX_CLK_I2C2	17
+#define LPC32XX_CLK_TIMER0	18
+#define LPC32XX_CLK_TIMER1	19
+#define LPC32XX_CLK_TIMER2	20
+#define LPC32XX_CLK_TIMER3	21
+#define LPC32XX_CLK_TIMER4	22
+#define LPC32XX_CLK_TIMER5	23
+#define LPC32XX_CLK_WDOG	24
+#define LPC32XX_CLK_I2S0	25
+#define LPC32XX_CLK_I2S1	26
+#define LPC32XX_CLK_SPI1	27
+#define LPC32XX_CLK_SPI2	28
+#define LPC32XX_CLK_MCPWM	29
+#define LPC32XX_CLK_HSTIMER	30
+#define LPC32XX_CLK_KEY		31
+#define LPC32XX_CLK_PWM1	32
+#define LPC32XX_CLK_PWM2	33
+#define LPC32XX_CLK_ADC		34
+#define LPC32XX_CLK_HCLK_PLL	35
+#define LPC32XX_CLK_PERIPH	36
+
+/* LPC32XX USB clocks */
+#define LPC32XX_USB_CLK_I2C	1
+#define LPC32XX_USB_CLK_DEVICE	2
+#define LPC32XX_USB_CLK_HOST	3
+
+#endif /* __DT_BINDINGS_LPC32XX_CLOCK_H */