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-rw-r--r--arch/um/drivers/harddog_kern.c1
-rw-r--r--arch/um/include/sysdep-x86_64/kernel-offsets.h1
-rw-r--r--arch/um/kernel/skas/uaccess.c15
-rw-r--r--arch/um/kernel/vmlinux.lds.S1
-rw-r--r--arch/um/os-Linux/umid.c97
-rw-r--r--arch/um/sys-i386/checksum.S1
-rw-r--r--arch/um/sys-i386/ptrace.c1
-rw-r--r--arch/um/sys-ppc/misc.S1
-rw-r--r--arch/um/sys-x86_64/syscall_table.c1
9 files changed, 73 insertions, 46 deletions
diff --git a/arch/um/drivers/harddog_kern.c b/arch/um/drivers/harddog_kern.c
index d18a974735e..64ff22aa077 100644
--- a/arch/um/drivers/harddog_kern.c
+++ b/arch/um/drivers/harddog_kern.c
@@ -35,7 +35,6 @@
*/
#include <linux/module.h>
-#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/fs.h>
diff --git a/arch/um/include/sysdep-x86_64/kernel-offsets.h b/arch/um/include/sysdep-x86_64/kernel-offsets.h
index 939cc475757..91d129fb393 100644
--- a/arch/um/include/sysdep-x86_64/kernel-offsets.h
+++ b/arch/um/include/sysdep-x86_64/kernel-offsets.h
@@ -1,4 +1,3 @@
-#include <linux/config.h>
#include <linux/stddef.h>
#include <linux/sched.h>
#include <linux/time.h>
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/kernel/vmlinux.lds.S b/arch/um/kernel/vmlinux.lds.S
index 0a7d50ff9a4..72acdce205e 100644
--- a/arch/um/kernel/vmlinux.lds.S
+++ b/arch/um/kernel/vmlinux.lds.S
@@ -1,4 +1,3 @@
-#include <linux/config.h>
/* in case the preprocessor is a 32bit one */
#undef i386
#ifdef CONFIG_LD_SCRIPT_STATIC
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/sys-i386/checksum.S b/arch/um/sys-i386/checksum.S
index d98b2fff3d0..62c7e564f22 100644
--- a/arch/um/sys-i386/checksum.S
+++ b/arch/um/sys-i386/checksum.S
@@ -25,7 +25,6 @@
* 2 of the License, or (at your option) any later version.
*/
-#include <linux/config.h>
#include <asm/errno.h>
/*
diff --git a/arch/um/sys-i386/ptrace.c b/arch/um/sys-i386/ptrace.c
index 6028bc7cc01..28bf0115032 100644
--- a/arch/um/sys-i386/ptrace.c
+++ b/arch/um/sys-i386/ptrace.c
@@ -3,7 +3,6 @@
* Licensed under the GPL
*/
-#include <linux/config.h>
#include <linux/compiler.h>
#include "linux/sched.h"
#include "linux/mm.h"
diff --git a/arch/um/sys-ppc/misc.S b/arch/um/sys-ppc/misc.S
index f0c971db47e..1364b7da578 100644
--- a/arch/um/sys-ppc/misc.S
+++ b/arch/um/sys-ppc/misc.S
@@ -15,7 +15,6 @@
*
*/
-#include <linux/config.h>
#include <asm/processor.h>
#include "ppc_asm.h"
diff --git a/arch/um/sys-x86_64/syscall_table.c b/arch/um/sys-x86_64/syscall_table.c
index 3c4318165de..9e9ad72c2ba 100644
--- a/arch/um/sys-x86_64/syscall_table.c
+++ b/arch/um/sys-x86_64/syscall_table.c
@@ -4,7 +4,6 @@
#include <linux/linkage.h>
#include <linux/sys.h>
#include <linux/cache.h>
-#include <linux/config.h>
#define __NO_STUBS
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-02 05:40:33 +0000