From b3a51cd353f213c99c475c8fac4f7526925f5949 Mon Sep 17 00:00:00 2001 From: deraadt Date: Mon, 14 Nov 2022 13:13:19 +0000 Subject: [PATCH] Since the introduction of automatic immutable from the kernel, the munmap() of ld.so boot.text region is now (silently) failing because the region is contained within the text LOAD, which is immutable. So create a new btext LOAD with flags PF_X|PF_R|PF_OPENBSD_MUTABLE, and place all boot.text objects in there. This LOAD must also be page-aligned so it doesn't skip unmapping some of the object region, previously it was hilariously unaligned. ok kettenis and guenther seemed to like it also This one is for powerpc64 and a modified version of the diff deraadt@ mailed out to make sure the LOADs are in increasing address order. this is the version for sparc64, tested by pascal also --- libexec/ld.so/sparc64/ld.script | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/libexec/ld.so/sparc64/ld.script b/libexec/ld.so/sparc64/ld.script index ca16652722b..34f7875a031 100644 --- a/libexec/ld.so/sparc64/ld.script +++ b/libexec/ld.so/sparc64/ld.script @@ -2,6 +2,7 @@ PHDRS { rodata PT_LOAD FILEHDR PHDRS FLAGS (4); text PT_LOAD; + btext PT_LOAD FLAGS (0x08000005); data PT_LOAD; random PT_OPENBSD_RANDOMIZE; relro PT_GNU_RELRO; @@ -20,13 +21,15 @@ SECTIONS /* .eh_frame : { *(.eh_frame) } :rodata */ /* TEXT */ - . = ALIGN(0x100000) + (. & (0x100000 - 1)) + 0; + . = ALIGN(0x100000); .boot.text : { + . = ALIGN(0x2000); boot_text_start = .; *(.boot.text) + . = ALIGN(0x2000); boot_text_end = .; - } :text =0xcccccccc + } :btext =0xcccccccc . = ALIGN(0x100000); .text : { *(.text .text.*) } :text =0xcccccccc -- 2.20.1