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-rw-r--r--arch/powerpc/kernel/Makefile3
-rw-r--r--arch/powerpc/kernel/process.c6
-rw-r--r--arch/powerpc/kernel/prom_init.c2
-rw-r--r--arch/powerpc/kernel/prom_init_check.sh2
-rw-r--r--arch/powerpc/kernel/ptrace/ptrace-fpu.c20
-rw-r--r--arch/powerpc/kernel/ptrace/ptrace.c3
-rw-r--r--arch/powerpc/kernel/rtas.c15
-rw-r--r--arch/powerpc/kernel/setup-common.c13
8 files changed, 44 insertions, 20 deletions
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 2e2a2a9bcf43..c8cf924bf9c0 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -20,6 +20,7 @@ CFLAGS_prom.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
CFLAGS_prom_init.o += -fno-stack-protector
CFLAGS_prom_init.o += -DDISABLE_BRANCH_PROFILING
CFLAGS_prom_init.o += -ffreestanding
+CFLAGS_prom_init.o += $(call cc-option, -ftrivial-auto-var-init=uninitialized)
ifdef CONFIG_FUNCTION_TRACER
# Do not trace early boot code
@@ -37,6 +38,8 @@ KASAN_SANITIZE_paca.o := n
KASAN_SANITIZE_setup_64.o := n
KASAN_SANITIZE_mce.o := n
KASAN_SANITIZE_mce_power.o := n
+KASAN_SANITIZE_udbg.o := n
+KASAN_SANITIZE_udbg_16550.o := n
# we have to be particularly careful in ppc64 to exclude code that
# runs with translations off, as we cannot access the shadow with
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index b62046bf3bb8..0fbda89cd1bb 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1855,7 +1855,7 @@ void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
tm_reclaim_current(0);
#endif
- memset(regs->gpr, 0, sizeof(regs->gpr));
+ memset(&regs->gpr[1], 0, sizeof(regs->gpr) - sizeof(regs->gpr[0]));
regs->ctr = 0;
regs->link = 0;
regs->xer = 0;
@@ -2158,12 +2158,12 @@ static unsigned long ___get_wchan(struct task_struct *p)
return 0;
do {
- sp = *(unsigned long *)sp;
+ sp = READ_ONCE_NOCHECK(*(unsigned long *)sp);
if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD) ||
task_is_running(p))
return 0;
if (count > 0) {
- ip = ((unsigned long *)sp)[STACK_FRAME_LR_SAVE];
+ ip = READ_ONCE_NOCHECK(((unsigned long *)sp)[STACK_FRAME_LR_SAVE]);
if (!in_sched_functions(ip))
return ip;
}
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 04694ec423f6..13d6cb188835 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -2302,7 +2302,7 @@ static void __init prom_init_stdout(void)
static int __init prom_find_machine_type(void)
{
- char compat[256];
+ static char compat[256] __prombss;
int len, i = 0;
#ifdef CONFIG_PPC64
phandle rtas;
diff --git a/arch/powerpc/kernel/prom_init_check.sh b/arch/powerpc/kernel/prom_init_check.sh
index b183ab9c5107..dfa5f729f774 100644
--- a/arch/powerpc/kernel/prom_init_check.sh
+++ b/arch/powerpc/kernel/prom_init_check.sh
@@ -13,7 +13,7 @@
# If you really need to reference something from prom_init.o add
# it to the list below:
-grep "^CONFIG_KASAN=y$" .config >/dev/null
+grep "^CONFIG_KASAN=y$" ${KCONFIG_CONFIG} >/dev/null
if [ $? -eq 0 ]
then
MEM_FUNCS="__memcpy __memset"
diff --git a/arch/powerpc/kernel/ptrace/ptrace-fpu.c b/arch/powerpc/kernel/ptrace/ptrace-fpu.c
index 5dca19361316..09c49632bfe5 100644
--- a/arch/powerpc/kernel/ptrace/ptrace-fpu.c
+++ b/arch/powerpc/kernel/ptrace/ptrace-fpu.c
@@ -17,9 +17,13 @@ int ptrace_get_fpr(struct task_struct *child, int index, unsigned long *data)
#ifdef CONFIG_PPC_FPU_REGS
flush_fp_to_thread(child);
- if (fpidx < (PT_FPSCR - PT_FPR0))
- memcpy(data, &child->thread.TS_FPR(fpidx), sizeof(long));
- else
+ if (fpidx < (PT_FPSCR - PT_FPR0)) {
+ if (IS_ENABLED(CONFIG_PPC32))
+ // On 32-bit the index we are passed refers to 32-bit words
+ *data = ((u32 *)child->thread.fp_state.fpr)[fpidx];
+ else
+ memcpy(data, &child->thread.TS_FPR(fpidx), sizeof(long));
+ } else
*data = child->thread.fp_state.fpscr;
#else
*data = 0;
@@ -39,9 +43,13 @@ int ptrace_put_fpr(struct task_struct *child, int index, unsigned long data)
#ifdef CONFIG_PPC_FPU_REGS
flush_fp_to_thread(child);
- if (fpidx < (PT_FPSCR - PT_FPR0))
- memcpy(&child->thread.TS_FPR(fpidx), &data, sizeof(long));
- else
+ if (fpidx < (PT_FPSCR - PT_FPR0)) {
+ if (IS_ENABLED(CONFIG_PPC32))
+ // On 32-bit the index we are passed refers to 32-bit words
+ ((u32 *)child->thread.fp_state.fpr)[fpidx] = data;
+ else
+ memcpy(&child->thread.TS_FPR(fpidx), &data, sizeof(long));
+ } else
child->thread.fp_state.fpscr = data;
#endif
diff --git a/arch/powerpc/kernel/ptrace/ptrace.c b/arch/powerpc/kernel/ptrace/ptrace.c
index 4d2dc22d4a2d..5d7a72b41ae7 100644
--- a/arch/powerpc/kernel/ptrace/ptrace.c
+++ b/arch/powerpc/kernel/ptrace/ptrace.c
@@ -444,4 +444,7 @@ void __init pt_regs_check(void)
* real registers.
*/
BUILD_BUG_ON(PT_DSCR < sizeof(struct user_pt_regs) / sizeof(unsigned long));
+
+ // ptrace_get/put_fpr() rely on PPC32 and VSX being incompatible
+ BUILD_BUG_ON(IS_ENABLED(CONFIG_PPC32) && IS_ENABLED(CONFIG_VSX));
}
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index 9bb43aa53d43..693133972294 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -993,8 +993,8 @@ int rtas_call_reentrant(int token, int nargs, int nret, int *outputs, ...)
*
* Return: A pointer to the specified errorlog or NULL if not found.
*/
-struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
- uint16_t section_id)
+noinstr struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
+ uint16_t section_id)
{
struct rtas_ext_event_log_v6 *ext_log =
(struct rtas_ext_event_log_v6 *)log->buffer;
@@ -1071,7 +1071,7 @@ static struct rtas_filter rtas_filters[] __ro_after_init = {
{ "get-time-of-day", -1, -1, -1, -1, -1 },
{ "ibm,get-vpd", -1, 0, -1, 1, 2 },
{ "ibm,lpar-perftools", -1, 2, 3, -1, -1 },
- { "ibm,platform-dump", -1, 4, 5, -1, -1 },
+ { "ibm,platform-dump", -1, 4, 5, -1, -1 }, /* Special cased */
{ "ibm,read-slot-reset-state", -1, -1, -1, -1, -1 },
{ "ibm,scan-log-dump", -1, 0, 1, -1, -1 },
{ "ibm,set-dynamic-indicator", -1, 2, -1, -1, -1 },
@@ -1120,6 +1120,15 @@ static bool block_rtas_call(int token, int nargs,
size = 1;
end = base + size - 1;
+
+ /*
+ * Special case for ibm,platform-dump - NULL buffer
+ * address is used to indicate end of dump processing
+ */
+ if (!strcmp(f->name, "ibm,platform-dump") &&
+ base == 0)
+ return false;
+
if (!in_rmo_buf(base, end))
goto err;
}
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index eb0077b302e2..1a02629ec70b 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -935,12 +935,6 @@ void __init setup_arch(char **cmdline_p)
/* Print various info about the machine that has been gathered so far. */
print_system_info();
- /* Reserve large chunks of memory for use by CMA for KVM. */
- kvm_cma_reserve();
-
- /* Reserve large chunks of memory for us by CMA for hugetlb */
- gigantic_hugetlb_cma_reserve();
-
klp_init_thread_info(&init_task);
setup_initial_init_mm(_stext, _etext, _edata, _end);
@@ -955,6 +949,13 @@ void __init setup_arch(char **cmdline_p)
initmem_init();
+ /*
+ * Reserve large chunks of memory for use by CMA for KVM and hugetlb. These must
+ * be called after initmem_init(), so that pageblock_order is initialised.
+ */
+ kvm_cma_reserve();
+ gigantic_hugetlb_cma_reserve();
+
early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
if (ppc_md.setup_arch)
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