From 33a154a96e71a34a1bcca9f40da343dbbf7b38b4 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Thu, 1 Oct 2026 14:52:55 +0000 Subject: selftests/bpf: Test packet range of pointers sharing an id 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 Link: https://lore.kernel.org/bpf/20261001145255.855630-2-alexei.starovoitov@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi --- include/uapi/asm-generic/signal.h | 93 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+) create mode 100644 include/uapi/asm-generic/signal.h (limited to 'include/uapi/asm-generic/signal.h') diff --git a/include/uapi/asm-generic/signal.h b/include/uapi/asm-generic/signal.h new file mode 100644 index 000000000..0eb69dc8e --- /dev/null +++ b/include/uapi/asm-generic/signal.h @@ -0,0 +1,93 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _UAPI__ASM_GENERIC_SIGNAL_H +#define _UAPI__ASM_GENERIC_SIGNAL_H + +#include + +#define _NSIG 64 +#define _NSIG_BPW __BITS_PER_LONG +#define _NSIG_WORDS (_NSIG / _NSIG_BPW) + +#define SIGHUP 1 +#define SIGINT 2 +#define SIGQUIT 3 +#define SIGILL 4 +#define SIGTRAP 5 +#define SIGABRT 6 +#define SIGIOT 6 +#define SIGBUS 7 +#define SIGFPE 8 +#define SIGKILL 9 +#define SIGUSR1 10 +#define SIGSEGV 11 +#define SIGUSR2 12 +#define SIGPIPE 13 +#define SIGALRM 14 +#define SIGTERM 15 +#define SIGSTKFLT 16 +#define SIGCHLD 17 +#define SIGCONT 18 +#define SIGSTOP 19 +#define SIGTSTP 20 +#define SIGTTIN 21 +#define SIGTTOU 22 +#define SIGURG 23 +#define SIGXCPU 24 +#define SIGXFSZ 25 +#define SIGVTALRM 26 +#define SIGPROF 27 +#define SIGWINCH 28 +#define SIGIO 29 +#define SIGPOLL SIGIO +/* +#define SIGLOST 29 +*/ +#define SIGPWR 30 +#define SIGSYS 31 +#define SIGUNUSED 31 + +/* These should not be considered constants from userland. */ +#define SIGRTMIN 32 +#ifndef SIGRTMAX +#define SIGRTMAX _NSIG +#endif + +#if !defined MINSIGSTKSZ || !defined SIGSTKSZ +#define MINSIGSTKSZ 2048 +#define SIGSTKSZ 8192 +#endif + +#ifndef __ASSEMBLY__ +typedef struct { + unsigned long sig[_NSIG_WORDS]; +} sigset_t; + +/* not actually used, but required for linux/syscalls.h */ +typedef unsigned long old_sigset_t; + +#include + +#ifdef SA_RESTORER +#define __ARCH_HAS_SA_RESTORER +#endif + +#ifndef __KERNEL__ +struct sigaction { + __sighandler_t sa_handler; + unsigned long sa_flags; +#ifdef SA_RESTORER + __sigrestore_t sa_restorer; +#endif + sigset_t sa_mask; /* mask last for extensibility */ +}; +#endif + +typedef struct sigaltstack { + void __user *ss_sp; + int ss_flags; + __kernel_size_t ss_size; +} stack_t; + +#endif /* __ASSEMBLY__ */ + +#endif /* _UAPI__ASM_GENERIC_SIGNAL_H */ -- cgit v1.3.1