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-rw-r--r--arch/i386/kernel/alternative.c6
-rw-r--r--arch/i386/mm/init.c9
-rw-r--r--arch/parisc/mm/init.c4
-rw-r--r--arch/s390/kernel/entry.S9
-rw-r--r--arch/s390/kernel/entry64.S1
-rw-r--r--arch/s390/mm/init.c35
-rw-r--r--arch/um/kernel/skas/uaccess.c15
-rw-r--r--arch/um/os-Linux/umid.c97
-rw-r--r--arch/um/scripts/Makefile.rules4
-rw-r--r--arch/x86_64/mm/init.c7
10 files changed, 118 insertions, 69 deletions
diff --git a/arch/i386/kernel/alternative.c b/arch/i386/kernel/alternative.c
index 50eb0e03777..7b421b3a053 100644
--- a/arch/i386/kernel/alternative.c
+++ b/arch/i386/kernel/alternative.c
@@ -168,6 +168,8 @@ void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
}
}
+#ifdef CONFIG_SMP
+
static void alternatives_smp_save(struct alt_instr *start, struct alt_instr *end)
{
struct alt_instr *a;
@@ -328,6 +330,8 @@ void alternatives_smp_switch(int smp)
spin_unlock_irqrestore(&smp_alt, flags);
}
+#endif
+
void __init alternative_instructions(void)
{
if (no_replacement) {
@@ -349,6 +353,7 @@ void __init alternative_instructions(void)
smp_alt_once = 1;
#endif
+#ifdef CONFIG_SMP
if (smp_alt_once) {
if (1 == num_possible_cpus()) {
printk(KERN_INFO "SMP alternatives: switching to UP code\n");
@@ -370,4 +375,5 @@ void __init alternative_instructions(void)
_text, _etext);
alternatives_smp_switch(0);
}
+#endif
}
diff --git a/arch/i386/mm/init.c b/arch/i386/mm/init.c
index dc5d8979cd6..89e8486aac3 100644
--- a/arch/i386/mm/init.c
+++ b/arch/i386/mm/init.c
@@ -725,16 +725,15 @@ static int noinline do_test_wp_bit(void)
#ifdef CONFIG_DEBUG_RODATA
-extern char __start_rodata, __end_rodata;
void mark_rodata_ro(void)
{
- unsigned long addr = (unsigned long)&__start_rodata;
+ unsigned long addr = (unsigned long)__start_rodata;
- for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE)
+ for (; addr < (unsigned long)__end_rodata; addr += PAGE_SIZE)
change_page_attr(virt_to_page(addr), 1, PAGE_KERNEL_RO);
- printk ("Write protecting the kernel read-only data: %luk\n",
- (unsigned long)(&__end_rodata - &__start_rodata) >> 10);
+ printk("Write protecting the kernel read-only data: %uk\n",
+ (__end_rodata - __start_rodata) >> 10);
/*
* change_page_attr() requires a global_flush_tlb() call after it.
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index b64602a99d8..f2b96f1e0da 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -27,6 +27,7 @@
#include <asm/tlb.h>
#include <asm/pdc_chassis.h>
#include <asm/mmzone.h>
+#include <asm/sections.h>
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
@@ -417,11 +418,10 @@ void free_initmem(void)
#ifdef CONFIG_DEBUG_RODATA
void mark_rodata_ro(void)
{
- extern char __start_rodata, __end_rodata;
/* rodata memory was already mapped with KERNEL_RO access rights by
pagetable_init() and map_pages(). No need to do additional stuff here */
printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
- (unsigned long)(&__end_rodata - &__start_rodata) >> 10);
+ (unsigned long)(__end_rodata - __start_rodata) >> 10);
}
#endif
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 1a434a7004e..d8948c342ca 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -228,8 +228,9 @@ sysc_do_svc:
sysc_nr_ok:
mvc SP_ARGS(4,%r15),SP_R7(%r15)
sysc_do_restart:
+ l %r8,BASED(.Lsysc_table)
tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
- l %r8,sys_call_table-system_call(%r7,%r13) # get system call addr.
+ l %r8,0(%r7,%r8) # get system call addr.
bnz BASED(sysc_tracesys)
basr %r14,%r8 # call sys_xxxx
st %r2,SP_R2(%r15) # store return value (change R2 on stack)
@@ -330,9 +331,10 @@ sysc_tracesys:
basr %r14,%r1
clc SP_R2(4,%r15),BASED(.Lnr_syscalls)
bnl BASED(sysc_tracenogo)
+ l %r8,BASED(.Lsysc_table)
l %r7,SP_R2(%r15) # strace might have changed the
sll %r7,2 # system call
- l %r8,sys_call_table-system_call(%r7,%r13)
+ l %r8,0(%r7,%r8)
sysc_tracego:
lm %r3,%r6,SP_R3(%r15)
l %r2,SP_ORIG_R2(%r15)
@@ -1009,6 +1011,7 @@ cleanup_io_leave_insn:
.Ltrace: .long syscall_trace
.Lvfork: .long sys_vfork
.Lschedtail: .long schedule_tail
+.Lsysc_table: .long sys_call_table
.Lcritical_start:
.long __critical_start + 0x80000000
@@ -1017,8 +1020,8 @@ cleanup_io_leave_insn:
.Lcleanup_critical:
.long cleanup_critical
+ .section .rodata, "a"
#define SYSCALL(esa,esame,emu) .long esa
sys_call_table:
#include "syscalls.S"
#undef SYSCALL
-
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index edad6077167..1ca499fa54b 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -991,6 +991,7 @@ cleanup_io_leave_insn:
.Lcritical_end:
.quad __critical_end
+ .section .rodata, "a"
#define SYSCALL(esa,esame,emu) .long esame
sys_call_table:
#include "syscalls.S"
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 81dce185f83..eb6ebfef134 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -23,6 +23,7 @@
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/bootmem.h>
+#include <linux/pfn.h>
#include <asm/processor.h>
#include <asm/system.h>
@@ -33,6 +34,7 @@
#include <asm/lowcore.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
+#include <asm/sections.h>
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
@@ -89,17 +91,6 @@ void show_mem(void)
printk("%d pages swap cached\n",cached);
}
-/* References to section boundaries */
-
-extern unsigned long _text;
-extern unsigned long _etext;
-extern unsigned long _edata;
-extern unsigned long __bss_start;
-extern unsigned long _end;
-
-extern unsigned long __init_begin;
-extern unsigned long __init_end;
-
extern unsigned long __initdata zholes_size[];
/*
* paging_init() sets up the page tables
@@ -116,6 +107,10 @@ void __init paging_init(void)
unsigned long pfn = 0;
unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE;
static const int ssm_mask = 0x04000000L;
+ unsigned long ro_start_pfn, ro_end_pfn;
+
+ ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata);
+ ro_end_pfn = PFN_UP((unsigned long)&__end_rodata);
/* unmap whole virtual address space */
@@ -143,7 +138,10 @@ void __init paging_init(void)
pg_dir++;
for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) {
- pte = pfn_pte(pfn, PAGE_KERNEL);
+ if (pfn >= ro_start_pfn && pfn < ro_end_pfn)
+ pte = pfn_pte(pfn, __pgprot(_PAGE_RO));
+ else
+ pte = pfn_pte(pfn, PAGE_KERNEL);
if (pfn >= max_low_pfn)
pte_clear(&init_mm, 0, &pte);
set_pte(pg_table, pte);
@@ -175,6 +173,7 @@ void __init paging_init(void)
}
#else /* CONFIG_64BIT */
+
void __init paging_init(void)
{
pgd_t * pg_dir;
@@ -186,13 +185,15 @@ void __init paging_init(void)
unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) |
_KERN_REGION_TABLE;
static const int ssm_mask = 0x04000000L;
-
unsigned long zones_size[MAX_NR_ZONES];
unsigned long dma_pfn, high_pfn;
+ unsigned long ro_start_pfn, ro_end_pfn;
memset(zones_size, 0, sizeof(zones_size));
dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
high_pfn = max_low_pfn;
+ ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata);
+ ro_end_pfn = PFN_UP((unsigned long)&__end_rodata);
if (dma_pfn > high_pfn)
zones_size[ZONE_DMA] = high_pfn;
@@ -231,7 +232,10 @@ void __init paging_init(void)
pmd_populate_kernel(&init_mm, pm_dir, pt_dir);
for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) {
- pte = pfn_pte(pfn, PAGE_KERNEL);
+ if (pfn >= ro_start_pfn && pfn < ro_end_pfn)
+ pte = pfn_pte(pfn, __pgprot(_PAGE_RO));
+ else
+ pte = pfn_pte(pfn, PAGE_KERNEL);
if (pfn >= max_low_pfn) {
pte_clear(&init_mm, 0, &pte);
continue;
@@ -282,6 +286,9 @@ void __init mem_init(void)
reservedpages << (PAGE_SHIFT-10),
datasize >>10,
initsize >> 10);
+ printk("Write protected kernel read-only data: %#lx - %#lx\n",
+ (unsigned long)&__start_rodata,
+ PFN_ALIGN((unsigned long)&__end_rodata) - 1);
}
void free_initmem(void)
diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c
index 5992c325716..8912cec0fe4 100644
--- a/arch/um/kernel/skas/uaccess.c
+++ b/arch/um/kernel/skas/uaccess.c
@@ -8,6 +8,7 @@
#include "linux/kernel.h"
#include "linux/string.h"
#include "linux/fs.h"
+#include "linux/hardirq.h"
#include "linux/highmem.h"
#include "asm/page.h"
#include "asm/pgtable.h"
@@ -38,7 +39,7 @@ static unsigned long maybe_map(unsigned long virt, int is_write)
return((unsigned long) phys);
}
-static int do_op(unsigned long addr, int len, int is_write,
+static int do_op_one_page(unsigned long addr, int len, int is_write,
int (*op)(unsigned long addr, int len, void *arg), void *arg)
{
struct page *page;
@@ -49,9 +50,11 @@ static int do_op(unsigned long addr, int len, int is_write,
return(-1);
page = phys_to_page(addr);
- addr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
+ addr = (unsigned long) kmap_atomic(page, KM_UML_USERCOPY) + (addr & ~PAGE_MASK);
+
n = (*op)(addr, len, arg);
- kunmap(page);
+
+ kunmap_atomic(page, KM_UML_USERCOPY);
return(n);
}
@@ -77,7 +80,7 @@ static void do_buffer_op(void *jmpbuf, void *arg_ptr)
remain = len;
current->thread.fault_catcher = jmpbuf;
- n = do_op(addr, size, is_write, op, arg);
+ n = do_op_one_page(addr, size, is_write, op, arg);
if(n != 0){
*res = (n < 0 ? remain : 0);
goto out;
@@ -91,7 +94,7 @@ static void do_buffer_op(void *jmpbuf, void *arg_ptr)
}
while(addr < ((addr + remain) & PAGE_MASK)){
- n = do_op(addr, PAGE_SIZE, is_write, op, arg);
+ n = do_op_one_page(addr, PAGE_SIZE, is_write, op, arg);
if(n != 0){
*res = (n < 0 ? remain : 0);
goto out;
@@ -105,7 +108,7 @@ static void do_buffer_op(void *jmpbuf, void *arg_ptr)
goto out;
}
- n = do_op(addr, remain, is_write, op, arg);
+ n = do_op_one_page(addr, remain, is_write, op, arg);
if(n != 0)
*res = (n < 0 ? remain : 0);
else *res = 0;
diff --git a/arch/um/os-Linux/umid.c b/arch/um/os-Linux/umid.c
index 362db059fe3..48092b95c8a 100644
--- a/arch/um/os-Linux/umid.c
+++ b/arch/um/os-Linux/umid.c
@@ -67,32 +67,53 @@ err:
return err;
}
-static int actually_do_remove(char *dir)
+/*
+ * Unlinks the files contained in @dir and then removes @dir.
+ * Doesn't handle directory trees, so it's not like rm -rf, but almost such. We
+ * ignore ENOENT errors for anything (they happen, strangely enough - possibly due
+ * to races between multiple dying UML threads).
+ */
+static int remove_files_and_dir(char *dir)
{
DIR *directory;
struct dirent *ent;
int len;
char file[256];
+ int ret;
directory = opendir(dir);
- if(directory == NULL)
- return -errno;
+ if (directory == NULL) {
+ if (errno != ENOENT)
+ return -errno;
+ else
+ return 0;
+ }
- while((ent = readdir(directory)) != NULL){
- if(!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
+ while ((ent = readdir(directory)) != NULL) {
+ if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
continue;
len = strlen(dir) + sizeof("/") + strlen(ent->d_name) + 1;
- if(len > sizeof(file))
- return -E2BIG;
+ if (len > sizeof(file)) {
+ ret = -E2BIG;
+ goto out;
+ }
sprintf(file, "%s/%s", dir, ent->d_name);
- if(unlink(file) < 0)
- return -errno;
+ if (unlink(file) < 0 && errno != ENOENT) {
+ ret = -errno;
+ goto out;
+ }
}
- if(rmdir(dir) < 0)
- return -errno;
- return 0;
+ if (rmdir(dir) < 0 && errno != ENOENT) {
+ ret = -errno;
+ goto out;
+ }
+
+ ret = 0;
+out:
+ closedir(directory);
+ return ret;
}
/* This says that there isn't already a user of the specified directory even if
@@ -103,9 +124,10 @@ static int actually_do_remove(char *dir)
* something other than UML sticking stuff in the directory
* this boot racing with a shutdown of the other UML
* In any of these cases, the directory isn't useful for anything else.
+ *
+ * Boolean return: 1 if in use, 0 otherwise.
*/
-
-static int not_dead_yet(char *dir)
+static inline int is_umdir_used(char *dir)
{
char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
char pid[sizeof("nnnnn\0")], *end;
@@ -113,7 +135,7 @@ static int not_dead_yet(char *dir)
n = snprintf(file, sizeof(file), "%s/pid", dir);
if(n >= sizeof(file)){
- printk("not_dead_yet - pid filename too long\n");
+ printk("is_umdir_used - pid filename too long\n");
err = -E2BIG;
goto out;
}
@@ -123,7 +145,7 @@ static int not_dead_yet(char *dir)
if(fd < 0) {
fd = -errno;
if(fd != -ENOENT){
- printk("not_dead_yet : couldn't open pid file '%s', "
+ printk("is_umdir_used : couldn't open pid file '%s', "
"err = %d\n", file, -fd);
}
goto out;
@@ -132,18 +154,18 @@ static int not_dead_yet(char *dir)
err = 0;
n = read(fd, pid, sizeof(pid));
if(n < 0){
- printk("not_dead_yet : couldn't read pid file '%s', "
+ printk("is_umdir_used : couldn't read pid file '%s', "
"err = %d\n", file, errno);
goto out_close;
} else if(n == 0){
- printk("not_dead_yet : couldn't read pid file '%s', "
+ printk("is_umdir_used : couldn't read pid file '%s', "
"0-byte read\n", file);
goto out_close;
}
p = strtoul(pid, &end, 0);
if(end == pid){
- printk("not_dead_yet : couldn't parse pid file '%s', "
+ printk("is_umdir_used : couldn't parse pid file '%s', "
"errno = %d\n", file, errno);
goto out_close;
}
@@ -153,19 +175,32 @@ static int not_dead_yet(char *dir)
return 1;
}
- err = actually_do_remove(dir);
- if(err)
- printk("not_dead_yet - actually_do_remove failed with "
- "err = %d\n", err);
-
- return err;
-
out_close:
close(fd);
out:
return 0;
}
+/*
+ * Try to remove the directory @dir unless it's in use.
+ * Precondition: @dir exists.
+ * Returns 0 for success, < 0 for failure in removal or if the directory is in
+ * use.
+ */
+static int umdir_take_if_dead(char *dir)
+{
+ int ret;
+ if (is_umdir_used(dir))
+ return -EEXIST;
+
+ ret = remove_files_and_dir(dir);
+ if (ret) {
+ printk("is_umdir_used - remove_files_and_dir failed with "
+ "err = %d\n", ret);
+ }
+ return ret;
+}
+
static void __init create_pid_file(void)
{
char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
@@ -244,11 +279,7 @@ int __init make_umid(void)
if(err != -EEXIST)
goto err;
- /* 1 -> this umid is already in use
- * < 0 -> we couldn't remove the umid directory
- * In either case, we can't use this umid, so return -EEXIST.
- */
- if(not_dead_yet(tmp) != 0)
+ if (umdir_take_if_dead(tmp) < 0)
goto err;
err = mkdir(tmp, 0777);
@@ -344,9 +375,9 @@ static void remove_umid_dir(void)
char dir[strlen(uml_dir) + UMID_LEN + 1], err;
sprintf(dir, "%s%s", uml_dir, umid);
- err = actually_do_remove(dir);
+ err = remove_files_and_dir(dir);
if(err)
- printf("remove_umid_dir - actually_do_remove failed with "
+ printf("remove_umid_dir - remove_files_and_dir failed with "
"err = %d\n", err);
}
diff --git a/arch/um/scripts/Makefile.rules b/arch/um/scripts/Makefile.rules
index 1347dc6d521..813077fb1e5 100644
--- a/arch/um/scripts/Makefile.rules
+++ b/arch/um/scripts/Makefile.rules
@@ -8,7 +8,7 @@ USER_OBJS += $(filter %_user.o,$(obj-y) $(obj-m) $(USER_SINGLE_OBJS))
USER_OBJS := $(foreach file,$(USER_OBJS),$(obj)/$(file))
$(USER_OBJS:.o=.%): \
- c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) $(CFLAGS_$(*F).o)
+ c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) $(CFLAGS_$(basetarget).o)
$(USER_OBJS) : CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ \
-Dunix -D__unix__ -D__$(SUBARCH)__
@@ -17,7 +17,7 @@ $(USER_OBJS) : CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ \
UNPROFILE_OBJS := $(foreach file,$(UNPROFILE_OBJS),$(obj)/$(file))
$(UNPROFILE_OBJS:.o=.%): \
- c_flags = -Wp,-MD,$(depfile) $(call unprofile,$(USER_CFLAGS)) $(CFLAGS_$(*F).o)
+ c_flags = -Wp,-MD,$(depfile) $(call unprofile,$(USER_CFLAGS)) $(CFLAGS_$(basetarget).o)
$(UNPROFILE_OBJS) : CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ \
-Dunix -D__unix__ -D__$(SUBARCH)__
diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c
index 72f140f81b7..d14fb2dfbfc 100644
--- a/arch/x86_64/mm/init.c
+++ b/arch/x86_64/mm/init.c
@@ -678,16 +678,15 @@ void free_initmem(void)
#ifdef CONFIG_DEBUG_RODATA
-extern char __start_rodata, __end_rodata;
void mark_rodata_ro(void)
{
- unsigned long addr = (unsigned long)&__start_rodata;
+ unsigned long addr = (unsigned long)__start_rodata;
- for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE)
+ for (; addr < (unsigned long)__end_rodata; addr += PAGE_SIZE)
change_page_attr_addr(addr, 1, PAGE_KERNEL_RO);
printk ("Write protecting the kernel read-only data: %luk\n",
- (&__end_rodata - &__start_rodata) >> 10);
+ (__end_rodata - __start_rodata) >> 10);
/*
* change_page_attr_addr() requires a global_flush_tlb() call after it.
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 19:42:19 +0000