Changes in relocate.c

b2473a35 - of/fdt: add dt_phys arg to early_init_dt_scan and early_init_dt_verify

Wed, 23 Oct 2024 17:14:26 +0000

of/fdt: add dt_phys arg to early_init_dt_scan and early_init_dt_verify __pa() is only intended to be used for linear map addresses and usingit for initial_boot_params which is in fixmap for arm64 will give anincorrect value. Hence save the physical address when it is known atboot time when calling early_init_dt_scan for arm64 and use it at kexectime instead of converting the virtual address using __pa().Note that arm64 doesn't need the FDT region reserved in the DT as thekernel explicitly reserves the passed in FDT. Therefore, only a debugwarning is fixed with this change.Reported-by: Breno Leitao Suggested-by: Mark Rutland Signed-off-by: Usama Arif Fixes: ac10be5cdbfa ("arm64: Use common of_kexec_alloc_and_setup_fdt()")Link: https://lore.kernel.org/r/20241023171426.452688-1-usamaarif642@gmail.comSigned-off-by: Rob Herring (Arm) List of files: /linux-6.15/arch/mips/kernel/relocate.c

2f9060b1 - MIPS: Fix typos

Wed, 03 Jan 2024 23:16:03 +0000

MIPS: Fix typosFix typos, most reported by "codespell arch/mips". Only touches comments,no code changes.Signed-off-by: Bjorn Helgaas Cc: linux-mips@vger.kernel.orgReviewed-by: Randy Dunlap Signed-off-by: Thomas Bogendoerfer List of files: /linux-6.15/arch/mips/kernel/relocate.c

877336c1 - MIPS: move from strlcpy with unused retval to strscpy

Thu, 18 Aug 2022 20:59:43 +0000

MIPS: move from strlcpy with unused retval to strscpyFollow the advice of the below link and prefer 'strscpy' in thissubsystem. Conversion is 1:1 because the return value is not used.Generated by a coccinelle script.Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/Signed-off-by: Wolfram Sang Signed-off-by: Thomas Bogendoerfer List of files: /linux-6.15/arch/mips/kernel/relocate.c

f39650de - kernel.h: split out panic and oops helpers

Thu, 01 Jul 2021 01:54:59 +0000

kernel.h: split out panic and oops helperskernel.h is being used as a dump for all kinds of stuff for a long time.Here is the attempt to start cleaning it up by splitting out panic andoops helpers.There are several purposes of doing this:- dropping dependency in bug.h- dropping a loop by moving out panic_notifier.h- unload kernel.h from something which has its own domainAt the same time convert users tree-wide to use new headers, although forthe time being include new header back to kernel.h to avoid twistedindirected includes for existing users.[akpm@linux-foundation.org: thread_info.h needs limits.h][andriy.shevchenko@linux.intel.com: ia64 fix] Link: https://lkml.kernel.org/r/20210520130557.55277-1-andriy.shevchenko@linux.intel.comLink: https://lkml.kernel.org/r/20210511074137.33666-1-andriy.shevchenko@linux.intel.comSigned-off-by: Andy Shevchenko Reviewed-by: Bjorn Andersson Co-developed-by: Andrew Morton Acked-by: Mike Rapoport Acked-by: Corey Minyard Acked-by: Christian Brauner Acked-by: Arnd Bergmann Acked-by: Kees Cook Acked-by: Wei Liu Acked-by: Rasmus Villemoes Signed-off-by: Andrew Morton Acked-by: Sebastian Reichel Acked-by: Luis Chamberlain Acked-by: Stephen Boyd Acked-by: Thomas Bogendoerfer Acked-by: Helge Deller # pariscSigned-off-by: Linus Torvalds List of files: /linux-6.15/arch/mips/kernel/relocate.c

457d2fc5 - MIPS: relocatable: Use __kaslr_offset in show_kernel_relocation

Fri, 05 Feb 2021 10:11:22 +0000

MIPS: relocatable: Use __kaslr_offset in show_kernel_relocationThe type of the VMLINUX_LOAD_ADDRESS macro is the (unsigned long long)in 32bits kernel but (unsigned long) in the 64-bit kernel. Although thereis no error here, avoid using it to calculate kaslr_offset.Signed-off-by: Jinyang He Signed-off-by: Thomas Bogendoerfer List of files: /linux-6.15/arch/mips/kernel/relocate.c

d4d3ef8b - MIPS: relocatable: Provide kaslr_offset() to get the kernel offset

Fri, 05 Feb 2021 10:11:21 +0000

MIPS: relocatable: Provide kaslr_offset() to get the kernel offsetProvide kaslr_offset() to get the kernel offset when KASLR is enabled.Error may occur before update_kaslr_offset(), so put it at the end ofthe offset branch.Fixes: a307a4ce9ecd ("MIPS: Loongson64: Add KASLR support")Reported-by: kernel test robot Signed-off-by: Jinyang He Signed-off-by: Thomas Bogendoerfer List of files: /linux-6.15/arch/mips/kernel/relocate.c

d9e84fb1 - MIPS: relocatable: optimize the relocation process

Sat, 16 Jan 2021 15:02:53 +0000

MIPS: relocatable: optimize the relocation processFor now, vmlinux relocation functions for relocatable kernel areimplemented as an array of handlers of a particular type.Convert that array into a single switch-case function to: - remove unused arguments; - change the return type of simple handlers to void; - remove the array and don't use any data at all; - avoid using indirect calls; - allow the compiler to inline and greatly optimize the relocation function[s];and also mark do_relocations() and show_kernel_relocation() staticas they aren't used anywhere else.The result on MIPS32 R2 with GCC 10.2 -O2 is:scripts/bloat-o-meter -c arch/mips/kernel/__relocate.o arch/mips/kernel/relocate.oadd/remove: 0/6 grow/shrink: 1/0 up/down: 356/-640 (-284)Function old new deltarelocate_kernel 852 1208 +356apply_r_mips_32_rel 20 - -20apply_r_mips_hi16_rel 40 - -40apply_r_mips_64_rel 44 - -44apply_r_mips_26_rel 144 - -144show_kernel_relocation 164 - -164do_relocations 228 - -228Total: Before=1780, After=1496, chg -15.96%add/remove: 0/1 grow/shrink: 0/0 up/down: 0/-76 (-76)Data old new deltareloc_handlers_rel 76 - -76Total: Before=92, After=16, chg -82.61%add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0 (0)RO Data old new deltaTotal: Before=0, After=0, chg +0.00%All functions were collapsed into the main one, relocate_kernel().Signed-off-by: Alexander Lobakin Signed-off-by: Thomas Bogendoerfer List of files: /linux-6.15/arch/mips/kernel/relocate.c

69e97683 - MIPS: relocatable: fix possible boot hangup with KASLR enabled

Sun, 10 Jan 2021 14:21:05 +0000

MIPS: relocatable: fix possible boot hangup with KASLR enabledLLVM-built Linux triggered a boot hangup with KASLR enabled.arch/mips/kernel/relocate.c:get_random_boot() uses linux_banner,which is a string constant, as a random seed, but accesses itas an array of unsigned long (in rotate_xor()).When the address of linux_banner is not aligned to sizeof(long),such access emits unaligned access exception and hangs the kernel.Use PTR_ALIGN() to align input address to sizeof(long) and alsoalign down the input length to prevent possible access-beyond-end.Fixes: 405bc8fd12f5 ("MIPS: Kernel: Implement KASLR using CONFIG_RELOCATABLE")Cc: stable@vger.kernel.org # 4.7+Signed-off-by: Alexander Lobakin Tested-by: Nathan Chancellor Reviewed-by: Kees Cook Signed-off-by: Thomas Bogendoerfer List of files: /linux-6.15/arch/mips/kernel/relocate.c

c0aac3a5 - MIPS: KASLR: Avoid endless loop in sync_icache if synci_step is zero

Fri, 04 Dec 2020 01:11:46 +0000

MIPS: KASLR: Avoid endless loop in sync_icache if synci_step is zeroMost platforms do not need to do synci instruction operations whensynci_step is 0. But for example, the synci implementation on Loongson64platform has some changes. On the one hand, it ensures that the memoryaccess instructions have been completed. On the other hand, it guaranteesthat all prefetch instructions need to be fetched again. And its addressinformation is useless. Thus, only one synci operation is required whensynci_step is 0 on Loongson64 platform. I guess that some other platformshave similar implementations on synci, so add judgment conditions in`while` to ensure that at least all platforms perform synci operationsonce. For those platforms that do not need synci, they just do one moreoperation similar to nop.Signed-off-by: Jinyang He Signed-off-by: Thomas Bogendoerfer List of files: /linux-6.15/arch/mips/kernel/relocate.c

a307a4ce - MIPS: Loongson64: Add KASLR support

Wed, 25 Nov 2020 10:07:46 +0000

MIPS: Loongson64: Add KASLR supportProvide a weak plat_get_fdt() in relocate.c in case some platform enableUSE_OF while plat_get_fdt() is useless.1MB RELOCATION_TABLE_SIZE is small for Loongson64 because too manyinstructions should be relocated. 2MB is enough in present.Add KASLR support for Loongson64.KASLR(kernel address space layout randomization)To enable KASLR on Loongson64:First, make loongson3_defconfig.Then, enable CONFIG_RELOCATABLE and CONFIG_RANDOMIZE_BASE.Finally, compile the kernel.To test KASLR on Loongson64:Start machine with KASLR kernel.The first time:# cat /proc/iomem00200000-0effffff : System RAM 02f30000-03895e9f : Kernel code 03895ea0-03bc7fff : Kernel data 03e30000-04f43f7f : Kernel bssThe second time:# cat /proc/iomem00200000-0effffff : System RAM 022f0000-02c55e9f : Kernel code 02c55ea0-02f87fff : Kernel data 031f0000-04303f7f : Kernel bssWe see that code, data and bss sections become randomize.Signed-off-by: Jinyang He Signed-off-by: Thomas Bogendoerfer List of files: /linux-6.15/arch/mips/kernel/relocate.c

74a2810b - MIPS: KASLR: Correct valid bits in apply_r_mips_26_rel()

Wed, 25 Nov 2020 10:07:18 +0000

MIPS: KASLR: Correct valid bits in apply_r_mips_26_rel()Apply_r_mips_26_rel() relocates instructions like j, jal and etc. Theseinstructions consist of 6bits function field and 26bits address field.The value of target_addr as follows,=================================================================| high 4bits | low 28bits |=================================================================|the high 4bits of this PC | the low 26bits of instructions << 2|=================================================================Thus, loc_orig and log_new both need high 4bits rather than high 6bits.Signed-off-by: Jinyang He Signed-off-by: Thomas Bogendoerfer List of files: /linux-6.15/arch/mips/kernel/relocate.c

49881542 - MIPS: Remove no-op/identity casts

Fri, 31 Aug 2018 18:49:20 +0000

MIPS: Remove no-op/identity castsClean up instances of casts to the type that a value already has, sincethey are effectively no-ops and only serve to complicate the code.This is the result of the following semantic patch: @identitycast@ type T; T *A; @@ - (T *)(A) + ASigned-off-by: Paul Burton Patchwork: https://patchwork.linux-mips.org/patch/19599/ List of files: /linux-6.15/arch/mips/kernel/relocate.c

fb615d61 - Update MIPS email addresses

Thu, 26 Oct 2017 00:04:33 +0000

Update MIPS email addressesMIPS will soon not be a part of Imagination Technologies, and as suchmany @imgtec.com email addresses will no longer be valid. This patchupdates the addresses for those who: - Have 10 or more patches in mainline authored using an @imgtec.com email address, or any patches dated within the past year. - Are still with Imagination but leaving as part of the MIPS business unit, as determined from an internal email address list. - Haven't already updated their email address (ie. JamesH) or expressed a desire to be excluded (ie. Maciej). - Acked v2 or earlier of this patch, which leaves Deng-Cheng, Matt & myself.New addresses are of the form firstname.lastname@mips.com, and allverified against an internal email address list. An entry is added to.mailmap for each person such that get_maintainer.pl will report the newaddresses rather than @imgtec.com addresses which will soon be dead.Instances of the affected addresses throughout the tree are thenmechanically replaced with the new @mips.com address.Signed-off-by: Paul Burton Cc: Deng-Cheng Zhu Cc: Deng-Cheng Zhu Acked-by: Dengcheng Zhu Cc: Matt Redfearn Cc: Matt Redfearn Acked-by: Matt Redfearn Cc: Andrew Morton Cc: linux-kernel@vger.kernel.orgCc: linux-mips@linux-mips.orgCc: trivial@kernel.orgSigned-off-by: Linus Torvalds List of files: /linux-6.15/arch/mips/kernel/relocate.c

48c834be - Update MIPS email addresses

Thu, 26 Oct 2017 00:04:33 +0000

Update MIPS email addressesMIPS will soon not be a part of Imagination Technologies, and as suchmany @imgtec.com email addresses will no longer be valid. This patchupdates the addresses for those who: - Have 10 or more patches in mainline authored using an @imgtec.com email address, or any patches dated within the past year. - Are still with Imagination but leaving as part of the MIPS business unit, as determined from an internal email address list. - Haven't already updated their email address (ie. JamesH) or expressed a desire to be excluded (ie. Maciej). - Acked v2 or earlier of this patch, which leaves Deng-Cheng, Matt & myself.New addresses are of the form firstname.lastname@mips.com, and allverified against an internal email address list. An entry is added to.mailmap for each person such that get_maintainer.pl will report the newaddresses rather than @imgtec.com addresses which will soon be dead.Instances of the affected addresses throughout the tree are thenmechanically replaced with the new @mips.com address.Signed-off-by: Paul Burton Cc: Deng-Cheng Zhu Cc: Deng-Cheng Zhu Acked-by: Dengcheng Zhu Cc: Matt Redfearn Cc: Matt Redfearn Acked-by: Matt Redfearn Cc: Andrew Morton Cc: linux-kernel@vger.kernel.orgCc: linux-mips@linux-mips.orgCc: trivial@kernel.orgPatchwork: https://patchwork.linux-mips.org/patch/17540/Signed-off-by: James Hogan List of files: /linux-6.15/arch/mips/kernel/relocate.c

ec62a3bd - MIPS: KASLR: Add missing header files

Fri, 31 Mar 2017 10:51:33 +0000

MIPS: KASLR: Add missing header filesAfter the split of linux/sched.h, KASLR stopped building.Fix this by including the correct header file for init_thread_unionSigned-off-by: Matt Redfearn Cc: James Hogan Cc: Marcin Nowakowski Cc: Steven J. Hill Cc: linux-mips@linux-mips.orgCc: linux-kernel@vger.kernel.orgPatchwork: https://patchwork.linux-mips.org/patch/15849/Signed-off-by: Ralf Baechle List of files: /linux-6.15/arch/mips/kernel/relocate.c

4c9fff36 - MIPS: relocate: Optionally relocate the DTB

Wed, 23 Nov 2016 13:43:48 +0000

MIPS: relocate: Optionally relocate the DTBIf the DTB is located in the target memory area for the relocated kernelit needs to be relocated as well before kernel relocation takes place.After copying the DTB use the new plat_fdt_relocated() API from therelocated kernel to ensure the relocated kernel updates any informationthat it may have cached about the location of the DTB.plat_fdt_relocated is declared as a weak symbol so that platforms thatdo not require it do not need to implement the method.Signed-off-by: Marcin Nowakowski Cc: linux-mips@linux-mips.orgPatchwork: https://patchwork.linux-mips.org/patch/14616/Signed-off-by: Ralf Baechle List of files: /linux-6.15/arch/mips/kernel/relocate.c

8cc709d7 - MIPS: Relocatable: Provide plat_post_relocation hook

Fri, 09 Dec 2016 08:36:22 +0000

MIPS: Relocatable: Provide plat_post_relocation hookThis hook provides the platform the chance to perform any requiredsetup before the boot processor switches to the relocated kernel.The relocated kernel has been copied and fixed up ready for executionat this point. Secondary CPUs may wish to switch to it early. Thereis also the opportunity for the platform to abort jumping to therelocated kernel if there is anything wrong with the chosen offset.Signed-off-by: Matt Redfearn Signed-off-by: Steven J. Hill Cc: linux-mips@linux-mips.orgPatchwork: https://patchwork.linux-mips.org/patch/14651/Signed-off-by: Ralf Baechle List of files: /linux-6.15/arch/mips/kernel/relocate.c

47366979 - MIPS: KASLR: Fix handling of NULL FDT

Mon, 17 Oct 2016 16:21:46 +0000

MIPS: KASLR: Fix handling of NULL FDTIf platform code returns a NULL pointer to the FDT, initial_boot_paramswill not get set to a valid pointer and attempting to find the /chosennode in it will cause a NULL pointer dereference and the kernel to crashimmediately on startup - with no output to the console.Fix this by checking that initial_boot_params is valid before using it.Fixes: 405bc8fd12f5 ("MIPS: Kernel: Implement KASLR using CONFIG_RELOCATABLE")Cc: stable@vger.kernel.org # 4.7+Signed-off-by: Matt Redfearn Cc: linux-mips@linux-mips.orgCc: linux-kernel@vger.kernel.orgPatchwork: https://patchwork.linux-mips.org/patch/14414/Signed-off-by: Ralf Baechle List of files: /linux-6.15/arch/mips/kernel/relocate.c

405bc8fd - MIPS: Kernel: Implement KASLR using CONFIG_RELOCATABLE

Thu, 31 Mar 2016 09:05:41 +0000

MIPS: Kernel: Implement KASLR using CONFIG_RELOCATABLEThis patch adds KASLR to the MIPS kernel.Entropy is derived from the banner, which will change every build andrandom_get_entropy() which should provide additional runtime entropy.Additionally the bootloader may pass entropy via the /chosen/kaslr-seednode in device tree.The kernel is relocated by up to RANDOMIZE_BASE_MAX_OFFSET bytes fromits link address (PHYSICAL_START). Because relocation happens so earlyin the kernel boot, the amount of physical memory has not yet beendetermined. This means the only way to limit relocation within theavailable memory is via Kconfig.Signed-off-by: Matt Redfearn Cc: linux-mips@linux-mips.orgCc: kernel-hardening@lists.openwall.comCc: linux-kernel@vger.kernel.orgPatchwork: https://patchwork.linux-mips.org/patch/12990/Signed-off-by: Ralf Baechle List of files: /linux-6.15/arch/mips/kernel/relocate.c

279b991b - MIPS: Kernel: Add relocate.c

Thu, 31 Mar 2016 09:05:36 +0000

MIPS: Kernel: Add relocate.carch/mips/kernel/relocate.c contains the functions necessary to relocatethe kernel elsewhere in memoryThe kernel makes a copy of itself at the new address. It uses therelocation table inserted by the relocs tool to fix symbol referenceswithin the new image.If copy/relocation is sucessful then the entry point of the new kernelis returned, otherwise fall back to starting the kernel in place.Signed-off-by: Matt Redfearn Cc: Thomas Gleixner Cc: James Hogan Cc: Paul Burton Cc: linux-mips@linux-mips.orgCc: kernel-hardening@lists.openwall.comCc: linux-kernel@vger.kernel.orgPatchwork: https://patchwork.linux-mips.org/patch/12985/Signed-off-by: Ralf Baechle List of files: /linux-6.15/arch/mips/kernel/relocate.c