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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-19 21:00:37 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-19 21:00:37 +0000 |
commit | 94ac2ab3fff96814d7460a27a0e9d004abbd4128 (patch) | |
tree | 9a4eb8cc234b540b0f4b93363109cdd37a20540b /arch/x86/entry/vdso | |
parent | Adding debian version 6.8.12-1. (diff) | |
download | linux-94ac2ab3fff96814d7460a27a0e9d004abbd4128.tar.xz linux-94ac2ab3fff96814d7460a27a0e9d004abbd4128.zip |
Merging upstream version 6.9.2.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/x86/entry/vdso')
-rw-r--r-- | arch/x86/entry/vdso/Makefile | 60 | ||||
-rw-r--r-- | arch/x86/entry/vdso/vma.c | 57 |
2 files changed, 26 insertions, 91 deletions
diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile index 73ac5adb0b..3d64bcc403 100644 --- a/arch/x86/entry/vdso/Makefile +++ b/arch/x86/entry/vdso/Makefile @@ -3,13 +3,15 @@ # Building vDSO images for x86. # -# Include the generic Makefile to check the built vdso. +# Include the generic Makefile to check the built vDSO: include $(srctree)/lib/vdso/Makefile # Sanitizer runtimes are unavailable and cannot be linked here. KASAN_SANITIZE := n KMSAN_SANITIZE_vclock_gettime.o := n +KMSAN_SANITIZE_vdso32/vclock_gettime.o := n KMSAN_SANITIZE_vgetcpu.o := n +KMSAN_SANITIZE_vdso32/vgetcpu.o := n UBSAN_SANITIZE := n KCSAN_SANITIZE := n @@ -18,52 +20,40 @@ OBJECT_FILES_NON_STANDARD := y # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. KCOV_INSTRUMENT := n -VDSO64-$(CONFIG_X86_64) := y -VDSOX32-$(CONFIG_X86_X32_ABI) := y -VDSO32-$(CONFIG_X86_32) := y -VDSO32-$(CONFIG_IA32_EMULATION) := y - -# files to link into the vdso +# Files to link into the vDSO: vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o vobjs32-y := vdso32/note.o vdso32/system_call.o vdso32/sigreturn.o vobjs32-y += vdso32/vclock_gettime.o vdso32/vgetcpu.o vobjs-$(CONFIG_X86_SGX) += vsgx.o -# files to link into kernel -obj-y += vma.o extable.o -KASAN_SANITIZE_vma.o := y -UBSAN_SANITIZE_vma.o := y -KCSAN_SANITIZE_vma.o := y +# Files to link into the kernel: +obj-y += vma.o extable.o +KASAN_SANITIZE_vma.o := y +UBSAN_SANITIZE_vma.o := y +KCSAN_SANITIZE_vma.o := y -OBJECT_FILES_NON_STANDARD_extable.o := n -OBJECT_FILES_NON_STANDARD_vdso-image-32.o := n -OBJECT_FILES_NON_STANDARD_vdso-image-x32.o := n -OBJECT_FILES_NON_STANDARD_vdso-image-64.o := n -OBJECT_FILES_NON_STANDARD_vdso32-setup.o := n OBJECT_FILES_NON_STANDARD_vma.o := n +OBJECT_FILES_NON_STANDARD_extable.o := n -# vDSO images to build -vdso_img-$(VDSO64-y) += 64 -vdso_img-$(VDSOX32-y) += x32 -vdso_img-$(VDSO32-y) += 32 +# vDSO images to build: +obj-$(CONFIG_X86_64) += vdso-image-64.o +obj-$(CONFIG_X86_X32_ABI) += vdso-image-x32.o +obj-$(CONFIG_COMPAT_32) += vdso-image-32.o vdso32-setup.o -obj-$(VDSO32-y) += vdso32-setup.o +OBJECT_FILES_NON_STANDARD_vdso-image-32.o := n +OBJECT_FILES_NON_STANDARD_vdso-image-x32.o := n +OBJECT_FILES_NON_STANDARD_vdso-image-64.o := n +OBJECT_FILES_NON_STANDARD_vdso32-setup.o := n -vobjs := $(foreach F,$(vobjs-y),$(obj)/$F) -vobjs32 := $(foreach F,$(vobjs32-y),$(obj)/$F) +vobjs := $(addprefix $(obj)/, $(vobjs-y)) +vobjs32 := $(addprefix $(obj)/, $(vobjs32-y)) $(obj)/vdso.o: $(obj)/vdso.so targets += vdso.lds $(vobjs-y) targets += vdso32/vdso32.lds $(vobjs32-y) -# Build the vDSO image C files and link them in. -vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o) -vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c) -vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg) -obj-y += $(vdso_img_objs) -targets += $(vdso_img_cfiles) -targets += $(vdso_img_sodbg) $(vdso_img-y:%=vdso%.so) +targets += $(foreach x, 64 x32 32, vdso-image-$(x).c vdso$(x).so vdso$(x).so.dbg) CPPFLAGS_vdso.lds += -P -C @@ -91,7 +81,7 @@ CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ -fno-omit-frame-pointer -foptimize-sibling-calls \ -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO -ifdef CONFIG_RETPOLINE +ifdef CONFIG_MITIGATION_RETPOLINE ifneq ($(RETPOLINE_VDSO_CFLAGS),) CFL += $(RETPOLINE_VDSO_CFLAGS) endif @@ -127,7 +117,7 @@ VDSO_LDFLAGS_vdsox32.lds = -m elf32_x86_64 -soname linux-vdso.so.1 \ vobjx32s-y := $(vobjs-y:.o=-x32.o) # same thing, but in the output directory -vobjx32s := $(foreach F,$(vobjx32s-y),$(obj)/$F) +vobjx32s := $(addprefix $(obj)/, $(vobjx32s-y)) # Convert 64bit object file to x32 for x32 vDSO. quiet_cmd_x32 = X32 $@ @@ -168,7 +158,7 @@ KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls) KBUILD_CFLAGS_32 += -fno-omit-frame-pointer KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING -ifdef CONFIG_RETPOLINE +ifdef CONFIG_MITIGATION_RETPOLINE ifneq ($(RETPOLINE_VDSO_CFLAGS),) KBUILD_CFLAGS_32 += $(RETPOLINE_VDSO_CFLAGS) endif @@ -194,5 +184,3 @@ GCOV_PROFILE := n quiet_cmd_vdso_and_check = VDSO $@ cmd_vdso_and_check = $(cmd_vdso); $(cmd_vdso_check) - -clean-files := vdso32.so vdso32.so.dbg vdso64* vdso-image-*.c vdsox32.so* diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c index 7645730dc2..6d83ceb7f1 100644 --- a/arch/x86/entry/vdso/vma.c +++ b/arch/x86/entry/vdso/vma.c @@ -274,59 +274,6 @@ up_fail: return ret; } -#ifdef CONFIG_X86_64 -/* - * Put the vdso above the (randomized) stack with another randomized - * offset. This way there is no hole in the middle of address space. - * To save memory make sure it is still in the same PTE as the stack - * top. This doesn't give that many random bits. - * - * Note that this algorithm is imperfect: the distribution of the vdso - * start address within a PMD is biased toward the end. - * - * Only used for the 64-bit and x32 vdsos. - */ -static unsigned long vdso_addr(unsigned long start, unsigned len) -{ - unsigned long addr, end; - unsigned offset; - - /* - * Round up the start address. It can start out unaligned as a result - * of stack start randomization. - */ - start = PAGE_ALIGN(start); - - /* Round the lowest possible end address up to a PMD boundary. */ - end = (start + len + PMD_SIZE - 1) & PMD_MASK; - if (end >= DEFAULT_MAP_WINDOW) - end = DEFAULT_MAP_WINDOW; - end -= len; - - if (end > start) { - offset = get_random_u32_below(((end - start) >> PAGE_SHIFT) + 1); - addr = start + (offset << PAGE_SHIFT); - } else { - addr = start; - } - - /* - * Forcibly align the final address in case we have a hardware - * issue that requires alignment for performance reasons. - */ - addr = align_vdso_addr(addr); - - return addr; -} - -static int map_vdso_randomized(const struct vdso_image *image) -{ - unsigned long addr = vdso_addr(current->mm->start_stack, image->size-image->sym_vvar_start); - - return map_vdso(image, addr); -} -#endif - int map_vdso_once(const struct vdso_image *image, unsigned long addr) { struct mm_struct *mm = current->mm; @@ -369,7 +316,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) if (!vdso64_enabled) return 0; - return map_vdso_randomized(&vdso_image_64); + return map_vdso(&vdso_image_64, 0); } #ifdef CONFIG_COMPAT @@ -380,7 +327,7 @@ int compat_arch_setup_additional_pages(struct linux_binprm *bprm, if (x32) { if (!vdso64_enabled) return 0; - return map_vdso_randomized(&vdso_image_x32); + return map_vdso(&vdso_image_x32, 0); } #endif #ifdef CONFIG_IA32_EMULATION |