[PATCH v5 08/15] mm/execmem, arch: convert remaining overrides of module_alloc to execmem
From: "Mike Rapoport (IBM)"
Extend execmem parameters to accommodate more complex overrides of
module_alloc() by architectures.
This includes specification of a fallback range required by arm, arm64
and powerpc, EXECMEM_MODULE_DATA type required by powerpc, support for
allocation of KASAN shadow required by s390 and x86 and support for
early initialization of execmem required by x86.
The core implementation of execmem_alloc() takes care of suppressing
warnings when the initial allocation fails but there is a fallback range
defined.
Signed-off-by: Mike Rapoport (IBM)
Acked-by: Will Deacon
---
arch/Kconfig | 6 +++
arch/arm/kernel/module.c | 41 ++---
arch/arm64/kernel/module.c | 67 ++--
arch/arm64/kernel/probes/kprobes.c | 7 ---
arch/arm64/net/bpf_jit_comp.c | 11 -
arch/powerpc/kernel/module.c | 60 -
arch/s390/kernel/module.c | 54 ++-
arch/x86/Kconfig | 1 +
arch/x86/kernel/module.c | 70 ++
include/linux/execmem.h| 34 +++
include/linux/moduleloader.h | 12 -
kernel/module/main.c | 26 +++
mm/execmem.c | 70 +-
mm/mm_init.c | 2 +
14 files changed, 259 insertions(+), 202 deletions(-)
diff --git a/arch/Kconfig b/arch/Kconfig
index 65afb1de48b3..7006f71f0110 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -960,6 +960,12 @@ config ARCH_WANTS_MODULES_DATA_IN_VMALLOC
For architectures like powerpc/32 which have constraints on module
allocation and need to allocate module data outside of module area.
+config ARCH_WANTS_EXECMEM_EARLY
+ bool
+ help
+ For architectures that might allocate executable memory early on
+ boot, for instance ftrace on x86.
+
config HAVE_IRQ_EXIT_ON_IRQ_STACK
bool
help
diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c
index e74d84f58b77..a98fdf6ff26c 100644
--- a/arch/arm/kernel/module.c
+++ b/arch/arm/kernel/module.c
@@ -16,6 +16,7 @@
#include
#include
#include
+#include
#include
#include
@@ -34,23 +35,31 @@
#endif
#ifdef CONFIG_MMU
-void *module_alloc(unsigned long size)
+static struct execmem_info execmem_info __ro_after_init;
+
+struct execmem_info __init *execmem_arch_setup(void)
{
- gfp_t gfp_mask = GFP_KERNEL;
- void *p;
-
- /* Silence the initial allocation */
- if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS))
- gfp_mask |= __GFP_NOWARN;
-
- p = __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
- gfp_mask, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
- __builtin_return_address(0));
- if (!IS_ENABLED(CONFIG_ARM_MODULE_PLTS) || p)
- return p;
- return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
- GFP_KERNEL, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
- __builtin_return_address(0));
+ unsigned long fallback_start = 0, fallback_end = 0;
+
+ if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS)) {
+ fallback_start = VMALLOC_START;
+ fallback_end = VMALLOC_END;
+ }
+
+ execmem_info = (struct execmem_info){
+ .ranges = {
+ [EXECMEM_DEFAULT] = {
+ .start = MODULES_VADDR,
+ .end= MODULES_END,
+ .pgprot = PAGE_KERNEL_EXEC,
+ .alignment = 1,
+ .fallback_start = fallback_start,
+ .fallback_end = fallback_end,
+ },
+ },
+ };
+
+ return _info;
}
#endif
diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c
index e92da4da1b2a..a52240ea084b 100644
--- a/arch/arm64/kernel/module.c
+++ b/arch/arm64/kernel/module.c
@@ -20,6 +20,7 @@
#include
#include
#include
+#include
#include
#include
@@ -108,41 +109,59 @@ static int __init module_init_limits(void)
return 0;
}
-subsys_initcall(module_init_limits);
-void *module_alloc(unsigned long size)
+static struct execmem_info execmem_info __ro_after_init;
+
+struct execmem_info __init *execmem_arch_setup(void)
{
- void *p = NULL;
+ unsigned long fallback_start = 0, fallback_end = 0;
+ unsigned long start = 0, end = 0;
+
+ module_init_limits();
/*
* Where possible, prefer to allocate within direct branch range of the
* kernel such that no PLTs are necessary.
*/
if (module_direct_base) {
- p = __vmalloc_node_range(size, MODULE_ALIGN,
-module_direct_base,
-
[PATCH v5 08/15] mm/execmem, arch: convert remaining overrides of module_alloc to execmem
From: "Mike Rapoport (IBM)"
Extend execmem parameters to accommodate more complex overrides of
module_alloc() by architectures.
This includes specification of a fallback range required by arm, arm64
and powerpc, EXECMEM_MODULE_DATA type required by powerpc, support for
allocation of KASAN shadow required by s390 and x86 and support for
early initialization of execmem required by x86.
The core implementation of execmem_alloc() takes care of suppressing
warnings when the initial allocation fails but there is a fallback range
defined.
Signed-off-by: Mike Rapoport (IBM)
Acked-by: Will Deacon
---
arch/Kconfig | 6 +++
arch/arm/kernel/module.c | 41 ++---
arch/arm64/kernel/module.c | 67 ++--
arch/arm64/kernel/probes/kprobes.c | 7 ---
arch/arm64/net/bpf_jit_comp.c | 11 -
arch/powerpc/kernel/module.c | 60 -
arch/s390/kernel/module.c | 54 ++-
arch/x86/Kconfig | 1 +
arch/x86/kernel/module.c | 70 ++
include/linux/execmem.h| 34 +++
include/linux/moduleloader.h | 12 -
kernel/module/main.c | 26 +++
mm/execmem.c | 70 +-
mm/mm_init.c | 2 +
14 files changed, 259 insertions(+), 202 deletions(-)
diff --git a/arch/Kconfig b/arch/Kconfig
index 65afb1de48b3..7006f71f0110 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -960,6 +960,12 @@ config ARCH_WANTS_MODULES_DATA_IN_VMALLOC
For architectures like powerpc/32 which have constraints on module
allocation and need to allocate module data outside of module area.
+config ARCH_WANTS_EXECMEM_EARLY
+ bool
+ help
+ For architectures that might allocate executable memory early on
+ boot, for instance ftrace on x86.
+
config HAVE_IRQ_EXIT_ON_IRQ_STACK
bool
help
diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c
index e74d84f58b77..a98fdf6ff26c 100644
--- a/arch/arm/kernel/module.c
+++ b/arch/arm/kernel/module.c
@@ -16,6 +16,7 @@
#include
#include
#include
+#include
#include
#include
@@ -34,23 +35,31 @@
#endif
#ifdef CONFIG_MMU
-void *module_alloc(unsigned long size)
+static struct execmem_info execmem_info __ro_after_init;
+
+struct execmem_info __init *execmem_arch_setup(void)
{
- gfp_t gfp_mask = GFP_KERNEL;
- void *p;
-
- /* Silence the initial allocation */
- if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS))
- gfp_mask |= __GFP_NOWARN;
-
- p = __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
- gfp_mask, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
- __builtin_return_address(0));
- if (!IS_ENABLED(CONFIG_ARM_MODULE_PLTS) || p)
- return p;
- return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
- GFP_KERNEL, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
- __builtin_return_address(0));
+ unsigned long fallback_start = 0, fallback_end = 0;
+
+ if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS)) {
+ fallback_start = VMALLOC_START;
+ fallback_end = VMALLOC_END;
+ }
+
+ execmem_info = (struct execmem_info){
+ .ranges = {
+ [EXECMEM_DEFAULT] = {
+ .start = MODULES_VADDR,
+ .end= MODULES_END,
+ .pgprot = PAGE_KERNEL_EXEC,
+ .alignment = 1,
+ .fallback_start = fallback_start,
+ .fallback_end = fallback_end,
+ },
+ },
+ };
+
+ return _info;
}
#endif
diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c
index e92da4da1b2a..a52240ea084b 100644
--- a/arch/arm64/kernel/module.c
+++ b/arch/arm64/kernel/module.c
@@ -20,6 +20,7 @@
#include
#include
#include
+#include
#include
#include
@@ -108,41 +109,59 @@ static int __init module_init_limits(void)
return 0;
}
-subsys_initcall(module_init_limits);
-void *module_alloc(unsigned long size)
+static struct execmem_info execmem_info __ro_after_init;
+
+struct execmem_info __init *execmem_arch_setup(void)
{
- void *p = NULL;
+ unsigned long fallback_start = 0, fallback_end = 0;
+ unsigned long start = 0, end = 0;
+
+ module_init_limits();
/*
* Where possible, prefer to allocate within direct branch range of the
* kernel such that no PLTs are necessary.
*/
if (module_direct_base) {
- p = __vmalloc_node_range(size, MODULE_ALIGN,
-module_direct_base,
-
