From 506ada89629ec7059b96ecfb0dc7d33ece0103ca Mon Sep 17 00:00:00 2001 From: Eduard Zingerman Date: Fri, 4 Sep 2026 17:05:56 -0700 Subject: bpf: mark a NULL kfunc argument precise check_kfunc_arg() allows bpf_register_is_null() for nullable arguments w/o marking the underlying scalar register precise. Hence a checkpoint created on such a path would prune against arbitrary scalar value. Fixes: 3bda08b63670 ("bpf: Allow NULL buffers in bpf_dynptr_slice(_rw)") Signed-off-by: Eduard Zingerman Link: https://lore.kernel.org/r/20260904-register-is-null-precise-fixes-v1-5-0f5a360ff15d@gmail.com Signed-off-by: Alexei Starovoitov --- arch/mips/mm/pgtable.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 arch/mips/mm/pgtable.c (limited to 'arch/mips/mm/pgtable.c') diff --git a/arch/mips/mm/pgtable.c b/arch/mips/mm/pgtable.c new file mode 100644 index 000000000..108354148 --- /dev/null +++ b/arch/mips/mm/pgtable.c @@ -0,0 +1,25 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include +#include +#include +#include + +pgd_t *pgd_alloc(struct mm_struct *mm) +{ + pgd_t *init, *ret; + + ret = __pgd_alloc(mm, PGD_TABLE_ORDER); + if (ret) { + init = pgd_offset(&init_mm, 0UL); + pgd_init(ret); + memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, + (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); + } + + return ret; +} +EXPORT_SYMBOL_GPL(pgd_alloc); -- cgit v1.3.1