From: Shiji Yang Date: Mon, 29 Apr 2024 02:11:17 +0000 (+0000) Subject: generic: MIPS64: fix detect_memory_region() compilation error X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=dcdcb9228be01e08ee6c1b7f5a7c60af53e07176;p=openwrt%2Fstaging%2Fneocturne.git generic: MIPS64: fix detect_memory_region() compilation error 1. Enable this feature only for 32-bit CPUs as MIPS64 can not access the full range unmapped uncached memory. 2. Backport this fix to the 6.1 old LTS kernel. Signed-off-by: Shiji Yang --- diff --git a/target/linux/generic/pending-6.1/350-mips-kernel-fix-detect_memory_region-function.patch b/target/linux/generic/pending-6.1/350-mips-kernel-fix-detect_memory_region-function.patch new file mode 100644 index 0000000000..3bf7ae98bf --- /dev/null +++ b/target/linux/generic/pending-6.1/350-mips-kernel-fix-detect_memory_region-function.patch @@ -0,0 +1,74 @@ +From: Shiji Yang +Date: Wed, 13 Mar 2024 20:28:37 +0800 +Subject: [PATCH] mips: kernel: fix detect_memory_region() function + +1. Do not use memcmp() on unallocated memory, as the new introduced + fortify dynamic object size check[1] will report unexpected result. +2. Use a fixed pattern instead of a random function pointer as the + magic value. +3. Flip magic value and double check it. +4. Enable this feature only for 32-bit CPUs. Currently, only ath79 and + ralink CPUs are using it. + +[1] 439a1bcac648 ("fortify: Use __builtin_dynamic_object_size() when available") +Signed-off-by: Shiji Yang +--- + arch/mips/include/asm/bootinfo.h | 2 ++ + arch/mips/kernel/setup.c | 17 ++++++++++++----- + 2 files changed, 14 insertions(+), 5 deletions(-) + +--- a/arch/mips/include/asm/bootinfo.h ++++ b/arch/mips/include/asm/bootinfo.h +@@ -93,7 +93,9 @@ const char *get_system_type(void); + + extern unsigned long mips_machtype; + ++#ifndef CONFIG_64BIT + extern void detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max); ++#endif + + extern void prom_init(void); + extern void prom_free_prom_memory(void); +--- a/arch/mips/kernel/setup.c ++++ b/arch/mips/kernel/setup.c +@@ -90,21 +90,27 @@ static struct resource bss_resource = { + unsigned long __kaslr_offset __ro_after_init; + EXPORT_SYMBOL(__kaslr_offset); + +-static void *detect_magic __initdata = detect_memory_region; +- + #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET + unsigned long ARCH_PFN_OFFSET; + EXPORT_SYMBOL(ARCH_PFN_OFFSET); + #endif + ++#ifndef CONFIG_64BIT ++static u32 detect_magic __initdata; ++#define MIPS_MEM_TEST_PATTERN 0xaa5555aa ++ + void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max) + { +- void *dm = &detect_magic; ++ void *dm = (void *)KSEG1ADDR(&detect_magic); + phys_addr_t size; + + for (size = sz_min; size < sz_max; size <<= 1) { +- if (!memcmp(dm, dm + size, sizeof(detect_magic))) +- break; ++ __raw_writel(MIPS_MEM_TEST_PATTERN, dm); ++ if (__raw_readl(dm) == __raw_readl(dm + size)) { ++ __raw_writel(~MIPS_MEM_TEST_PATTERN, dm); ++ if (__raw_readl(dm) == __raw_readl(dm + size)) ++ break; ++ } + } + + pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n", +@@ -115,6 +121,7 @@ void __init detect_memory_region(phys_ad + + memblock_add(start, size); + } ++#endif /* CONFIG_64BIT */ + + /* + * Manage initrd diff --git a/target/linux/generic/pending-6.6/350-mips-kernel-fix-detect_memory_region-function.patch b/target/linux/generic/pending-6.6/350-mips-kernel-fix-detect_memory_region-function.patch index 4654bc14ef..3bf7ae98bf 100644 --- a/target/linux/generic/pending-6.6/350-mips-kernel-fix-detect_memory_region-function.patch +++ b/target/linux/generic/pending-6.6/350-mips-kernel-fix-detect_memory_region-function.patch @@ -7,35 +7,45 @@ Subject: [PATCH] mips: kernel: fix detect_memory_region() function 2. Use a fixed pattern instead of a random function pointer as the magic value. 3. Flip magic value and double check it. +4. Enable this feature only for 32-bit CPUs. Currently, only ath79 and + ralink CPUs are using it. [1] 439a1bcac648 ("fortify: Use __builtin_dynamic_object_size() when available") Signed-off-by: Shiji Yang --- - arch/mips/kernel/setup.c | 16 +++++++++++----- - 1 file changed, 11 insertions(+), 5 deletions(-) + arch/mips/include/asm/bootinfo.h | 2 ++ + arch/mips/kernel/setup.c | 17 ++++++++++++----- + 2 files changed, 14 insertions(+), 5 deletions(-) +--- a/arch/mips/include/asm/bootinfo.h ++++ b/arch/mips/include/asm/bootinfo.h +@@ -93,7 +93,9 @@ const char *get_system_type(void); + + extern unsigned long mips_machtype; + ++#ifndef CONFIG_64BIT + extern void detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max); ++#endif + + extern void prom_init(void); + extern void prom_free_prom_memory(void); --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c -@@ -46,6 +46,8 @@ - #include - #include - -+#define MIPS_MEM_TEST_PATTERN 0xaa5555aa -+ - #ifdef CONFIG_MIPS_ELF_APPENDED_DTB - char __section(".appended_dtb") __appended_dtb[0x100000]; - #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */ -@@ -90,7 +92,7 @@ static struct resource bss_resource = { +@@ -90,21 +90,27 @@ static struct resource bss_resource = { unsigned long __kaslr_offset __ro_after_init; EXPORT_SYMBOL(__kaslr_offset); -static void *detect_magic __initdata = detect_memory_region; -+static u32 detect_magic __initdata; - +- #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET unsigned long ARCH_PFN_OFFSET; -@@ -99,12 +101,16 @@ EXPORT_SYMBOL(ARCH_PFN_OFFSET); + EXPORT_SYMBOL(ARCH_PFN_OFFSET); + #endif ++#ifndef CONFIG_64BIT ++static u32 detect_magic __initdata; ++#define MIPS_MEM_TEST_PATTERN 0xaa5555aa ++ void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max) { - void *dm = &detect_magic; @@ -54,3 +64,11 @@ Signed-off-by: Shiji Yang } pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n", +@@ -115,6 +121,7 @@ void __init detect_memory_region(phys_ad + + memblock_add(start, size); + } ++#endif /* CONFIG_64BIT */ + + /* + * Manage initrd diff --git a/target/linux/ramips/patches-6.1/314-MIPS-add-bootargs-override-property.patch b/target/linux/ramips/patches-6.1/314-MIPS-add-bootargs-override-property.patch index 26a28167c6..ac3f3b7aba 100644 --- a/target/linux/ramips/patches-6.1/314-MIPS-add-bootargs-override-property.patch +++ b/target/linux/ramips/patches-6.1/314-MIPS-add-bootargs-override-property.patch @@ -17,7 +17,7 @@ Signed-off-by: David Bauer --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c -@@ -557,8 +557,28 @@ static int __init bootcmdline_scan_chose +@@ -564,8 +564,28 @@ static int __init bootcmdline_scan_chose #endif /* CONFIG_OF_EARLY_FLATTREE */ @@ -46,7 +46,7 @@ Signed-off-by: David Bauer bool dt_bootargs = false; /* -@@ -572,6 +592,14 @@ static void __init bootcmdline_init(void +@@ -579,6 +599,14 @@ static void __init bootcmdline_init(void } /* diff --git a/target/linux/ramips/patches-6.1/315-owrt-hack-fix-mt7688-cache-issue.patch b/target/linux/ramips/patches-6.1/315-owrt-hack-fix-mt7688-cache-issue.patch index c31e6d7cde..f296c2d18d 100644 --- a/target/linux/ramips/patches-6.1/315-owrt-hack-fix-mt7688-cache-issue.patch +++ b/target/linux/ramips/patches-6.1/315-owrt-hack-fix-mt7688-cache-issue.patch @@ -10,7 +10,7 @@ Signed-off-by: John Crispin --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c -@@ -699,7 +699,6 @@ static void __init arch_mem_init(char ** +@@ -706,7 +706,6 @@ static void __init arch_mem_init(char ** mips_reserve_vmcore(); mips_parse_crashkernel(); @@ -18,7 +18,7 @@ Signed-off-by: John Crispin /* * In order to reduce the possibility of kernel panic when failed to -@@ -834,6 +833,7 @@ void __init setup_arch(char **cmdline_p) +@@ -841,6 +840,7 @@ void __init setup_arch(char **cmdline_p) cpu_cache_init(); paging_init(); diff --git a/target/linux/ramips/patches-6.6/314-MIPS-add-bootargs-override-property.patch b/target/linux/ramips/patches-6.6/314-MIPS-add-bootargs-override-property.patch index f9975986fe..ac3f3b7aba 100644 --- a/target/linux/ramips/patches-6.6/314-MIPS-add-bootargs-override-property.patch +++ b/target/linux/ramips/patches-6.6/314-MIPS-add-bootargs-override-property.patch @@ -17,7 +17,7 @@ Signed-off-by: David Bauer --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c -@@ -563,8 +563,28 @@ static int __init bootcmdline_scan_chose +@@ -564,8 +564,28 @@ static int __init bootcmdline_scan_chose #endif /* CONFIG_OF_EARLY_FLATTREE */ @@ -46,7 +46,7 @@ Signed-off-by: David Bauer bool dt_bootargs = false; /* -@@ -578,6 +598,14 @@ static void __init bootcmdline_init(void +@@ -579,6 +599,14 @@ static void __init bootcmdline_init(void } /* diff --git a/target/linux/ramips/patches-6.6/315-owrt-hack-fix-mt7688-cache-issue.patch b/target/linux/ramips/patches-6.6/315-owrt-hack-fix-mt7688-cache-issue.patch index 04f0a67325..2bb3d55d70 100644 --- a/target/linux/ramips/patches-6.6/315-owrt-hack-fix-mt7688-cache-issue.patch +++ b/target/linux/ramips/patches-6.6/315-owrt-hack-fix-mt7688-cache-issue.patch @@ -10,7 +10,7 @@ Signed-off-by: John Crispin --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c -@@ -705,7 +705,6 @@ static void __init arch_mem_init(char ** +@@ -706,7 +706,6 @@ static void __init arch_mem_init(char ** mips_reserve_vmcore(); mips_parse_crashkernel(); @@ -18,7 +18,7 @@ Signed-off-by: John Crispin /* * In order to reduce the possibility of kernel panic when failed to -@@ -841,6 +840,7 @@ void __init setup_arch(char **cmdline_p) +@@ -842,6 +841,7 @@ void __init setup_arch(char **cmdline_p) cpu_cache_init(); paging_init();