+++ /dev/null
-From f44f1e7da7c8e3f4575d5d61c4df978496903fcc Mon Sep 17 00:00:00 2001
-From: Florian Fainelli <f.fainelli@gmail.com>
-Date: Tue, 23 May 2017 17:32:31 -0700
-Subject: [PATCH] um: Avoid longjmp/setjmp symbol clashes with libpthread.a
-
-[ Upstream commit f44f1e7da7c8e3f4575d5d61c4df978496903fcc ]
-
-Building a statically linked UML kernel on a Centos 6.9 host resulted in
-the following linking failure (GCC 4.4, glibc-2.12):
-
-/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libpthread.a(libpthread.o):
-In function `siglongjmp':
-(.text+0x8490): multiple definition of `longjmp'
-arch/x86/um/built-in.o:/local/users/fainelli/openwrt/trunk/build_dir/target-x86_64_musl/linux-uml/linux-4.4.69/arch/x86/um/setjmp_64.S:44:
-first defined here
-/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libpthread.a(libpthread.o):
-In function `sem_open':
-(.text+0x77cd): warning: the use of `mktemp' is dangerous, better use
-`mkstemp'
-collect2: ld returned 1 exit status
-make[4]: *** [vmlinux] Error 1
-
-Adopt a solution similar to the one done for vmap where we define
-longjmp/setjmp to be kernel_longjmp/setjmp. In the process, make sure we
-do rename the functions in arch/x86/um/setjmp_*.S accordingly.
-
-Fixes: a7df4716d195 ("um: link with -lpthread")
-Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
-Signed-off-by: Richard Weinberger <richard@nod.at>
----
- arch/um/Makefile | 4 ++++
- arch/x86/um/setjmp_32.S | 16 ++++++++--------
- arch/x86/um/setjmp_64.S | 16 ++++++++--------
- 3 files changed, 20 insertions(+), 16 deletions(-)
-
---- a/arch/um/Makefile
-+++ b/arch/um/Makefile
-@@ -59,10 +59,14 @@ KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_D
- # Same things for in6addr_loopback and mktime - found in libc. For these two we
- # only get link-time error, luckily.
- #
-+# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
-+# embedded copy of longjmp, same thing for setjmp.
-+#
- # These apply to USER_CFLAGS to.
-
- KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
- $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
-+ -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
- -Din6addr_loopback=kernel_in6addr_loopback \
- -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
-
---- a/arch/x86/um/setjmp_32.S
-+++ b/arch/x86/um/setjmp_32.S
-@@ -16,9 +16,9 @@
-
- .text
- .align 4
-- .globl setjmp
-- .type setjmp, @function
--setjmp:
-+ .globl kernel_setjmp
-+ .type kernel_setjmp, @function
-+kernel_setjmp:
- #ifdef _REGPARM
- movl %eax,%edx
- #else
-@@ -35,13 +35,13 @@ setjmp:
- movl %ecx,20(%edx) # Return address
- ret
-
-- .size setjmp,.-setjmp
-+ .size kernel_setjmp,.-kernel_setjmp
-
- .text
- .align 4
-- .globl longjmp
-- .type longjmp, @function
--longjmp:
-+ .globl kernel_longjmp
-+ .type kernel_longjmp, @function
-+kernel_longjmp:
- #ifdef _REGPARM
- xchgl %eax,%edx
- #else
-@@ -55,4 +55,4 @@ longjmp:
- movl 16(%edx),%edi
- jmp *20(%edx)
-
-- .size longjmp,.-longjmp
-+ .size kernel_longjmp,.-kernel_longjmp
---- a/arch/x86/um/setjmp_64.S
-+++ b/arch/x86/um/setjmp_64.S
-@@ -18,9 +18,9 @@
-
- .text
- .align 4
-- .globl setjmp
-- .type setjmp, @function
--setjmp:
-+ .globl kernel_setjmp
-+ .type kernel_setjmp, @function
-+kernel_setjmp:
- pop %rsi # Return address, and adjust the stack
- xorl %eax,%eax # Return value
- movq %rbx,(%rdi)
-@@ -34,13 +34,13 @@ setjmp:
- movq %rsi,56(%rdi) # Return address
- ret
-
-- .size setjmp,.-setjmp
-+ .size kernel_setjmp,.-kernel_setjmp
-
- .text
- .align 4
-- .globl longjmp
-- .type longjmp, @function
--longjmp:
-+ .globl kernel_longjmp
-+ .type kernel_longjmp, @function
-+kernel_longjmp:
- movl %esi,%eax # Return value (int)
- movq (%rdi),%rbx
- movq 8(%rdi),%rsp
-@@ -51,4 +51,4 @@ longjmp:
- movq 48(%rdi),%r15
- jmp *56(%rdi)
-
-- .size longjmp,.-longjmp
-+ .size kernel_longjmp,.-kernel_longjmp
+++ /dev/null
-#
-# Minimalist mconsole exec patch
-#
-# 3.10 version (with bit more synchronous behavior) by fingon at iki dot fi
-# Adaptation to kernel 3.3.8 made by David Fernández (david at dit.upm.es) for
-# Starting point: mconsole-exec-2.6.30.patch for kernel 2.6.30
-# Author of original patch: Paolo Giarrusso, aka Blaisorblade
-# (http://www.user-mode-linux.org/~blaisorblade)
-#
-# Known misfeatures:
-#
-# - If output is too long, blocks (and breaks horribly)
-# (this misfeature from 3.10 patches, when minimalizing the patch;
-# workaround: redirect to a shared filesystem if long output is expected)
-#
-# - Nothing useful is done with stdin
-#
---- a/arch/um/drivers/mconsole.h
-+++ b/arch/um/drivers/mconsole.h
-@@ -85,6 +85,7 @@ extern void mconsole_cad(struct mc_reque
- extern void mconsole_stop(struct mc_request *req);
- extern void mconsole_go(struct mc_request *req);
- extern void mconsole_log(struct mc_request *req);
-+extern void mconsole_exec(struct mc_request *req);
- extern void mconsole_proc(struct mc_request *req);
- extern void mconsole_stack(struct mc_request *req);
-
---- a/arch/um/drivers/mconsole_kern.c
-+++ b/arch/um/drivers/mconsole_kern.c
-@@ -4,6 +4,7 @@
- * Licensed under the GPL
- */
-
-+#include "linux/kmod.h"
- #include <linux/console.h>
- #include <linux/ctype.h>
- #include <linux/string.h>
-@@ -24,6 +25,7 @@
- #include <linux/fs.h>
- #include <linux/mount.h>
- #include <linux/file.h>
-+#include <linux/completion.h>
- #include <asm/uaccess.h>
- #include <asm/switch_to.h>
-
-@@ -121,6 +123,59 @@ void mconsole_log(struct mc_request *req
- mconsole_reply(req, "", 0, 0);
- }
-
-+void mconsole_exec(struct mc_request *req)
-+{
-+ struct subprocess_info *sub_info;
-+ int res, len;
-+ struct file *out;
-+ char buf[MCONSOLE_MAX_DATA];
-+
-+ char *envp[] = {
-+ "HOME=/", "TERM=linux",
-+ "PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin",
-+ NULL
-+ };
-+ char *argv[] = {
-+ "/bin/sh", "-c",
-+ req->request.data + strlen("exec "),
-+ NULL
-+ };
-+
-+ sub_info = call_usermodehelper_setup("/bin/sh", argv, envp, GFP_ATOMIC, NULL, NULL, NULL);
-+ if (sub_info == NULL) {
-+ mconsole_reply(req, "call_usermodehelper_setup failed", 1, 0);
-+ return;
-+ }
-+ res = call_usermodehelper_stdoutpipe(sub_info, &out);
-+ if (res < 0) {
-+ kfree(sub_info);
-+ mconsole_reply(req, "call_usermodehelper_stdoutpipe failed", 1, 0);
-+ return;
-+ }
-+
-+ res = call_usermodehelper_exec(sub_info, UMH_WAIT_PROC);
-+ if (res < 0) {
-+ kfree(sub_info);
-+ mconsole_reply(req, "call_usermodehelper_exec failed", 1, 0);
-+ return;
-+ }
-+
-+ for (;;) {
-+ len = out->f_op->read(out, buf, sizeof(buf), &out->f_pos);
-+ if (len < 0) {
-+ mconsole_reply(req, "reading output failed", 1, 0);
-+ break;
-+ }
-+ if (len == 0)
-+ break;
-+ mconsole_reply_len(req, buf, len, 0, 1);
-+ }
-+ fput(out);
-+
-+ mconsole_reply_len(req, NULL, 0, 0, 0);
-+}
-+
-+
- void mconsole_proc(struct mc_request *req)
- {
- struct vfsmount *mnt = task_active_pid_ns(current)->proc_mnt;
-@@ -187,6 +242,7 @@ void mconsole_proc(struct mc_request *re
- stop - pause the UML; it will do nothing until it receives a 'go' \n\
- go - continue the UML after a 'stop' \n\
- log <string> - make UML enter <string> into the kernel log\n\
-+ exec <string> - pass <string> to /bin/sh -c synchronously\n\
- proc <file> - returns the contents of the UML's /proc/<file>\n\
- stack <pid> - returns the stack of the specified pid\n\
- "
---- a/arch/um/drivers/mconsole_user.c
-+++ b/arch/um/drivers/mconsole_user.c
-@@ -30,6 +30,7 @@ static struct mconsole_command commands[
- { "stop", mconsole_stop, MCONSOLE_PROC },
- { "go", mconsole_go, MCONSOLE_INTR },
- { "log", mconsole_log, MCONSOLE_INTR },
-+ { "exec", mconsole_exec, MCONSOLE_PROC },
- { "proc", mconsole_proc, MCONSOLE_PROC },
- { "stack", mconsole_stack, MCONSOLE_INTR },
- };
---- a/arch/um/os-Linux/file.c
-+++ b/arch/um/os-Linux/file.c
-@@ -535,6 +535,8 @@ int os_create_unix_socket(const char *fi
-
- addr.sun_family = AF_UNIX;
-
-+ if (len > sizeof(addr.sun_path))
-+ len = sizeof(addr.sun_path);
- snprintf(addr.sun_path, len, "%s", file);
-
- err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
---- a/include/linux/kmod.h
-+++ b/include/linux/kmod.h
-@@ -62,6 +62,7 @@ struct subprocess_info {
- int wait;
- int retval;
- int (*init)(struct subprocess_info *info, struct cred *new);
-+ struct file *stdout;
- void (*cleanup)(struct subprocess_info *info);
- void *data;
- };
-@@ -102,4 +103,6 @@ extern int usermodehelper_read_trylock(v
- extern long usermodehelper_read_lock_wait(long timeout);
- extern void usermodehelper_read_unlock(void);
-
-+int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info, struct file **filp);
-+
- #endif /* __LINUX_KMOD_H__ */
---- a/kernel/kmod.c
-+++ b/kernel/kmod.c
-@@ -39,6 +39,7 @@
- #include <linux/rwsem.h>
- #include <linux/ptrace.h>
- #include <linux/async.h>
-+#include <linux/pipe_fs_i.h>
- #include <asm/uaccess.h>
-
- #include <trace/events/module.h>
-@@ -222,6 +223,28 @@ static int call_usermodehelper_exec_asyn
- flush_signal_handlers(current, 1);
- spin_unlock_irq(¤t->sighand->siglock);
-
-+ /* Install output when needed */
-+ if (sub_info->stdout) {
-+ struct files_struct *f = current->files;
-+ struct fdtable *fdt;
-+
-+ sys_close(1);
-+ sys_close(2);
-+ get_file(sub_info->stdout);
-+ fd_install(1, sub_info->stdout);
-+ fd_install(2, sub_info->stdout);
-+ spin_lock(&f->file_lock);
-+ fdt = files_fdtable(f);
-+ __set_bit(1, fdt->open_fds);
-+ __clear_bit(1, fdt->close_on_exec);
-+ __set_bit(2, fdt->open_fds);
-+ __clear_bit(2, fdt->close_on_exec);
-+ spin_unlock(&f->file_lock);
-+
-+ /* disallow core files */
-+ current->signal->rlim[RLIMIT_CORE] = (struct rlimit){0, 0};
-+ }
-+
- /*
- * Our parent (unbound workqueue) runs with elevated scheduling
- * priority. Avoid propagating that into the userspace child.
-@@ -540,6 +563,20 @@ struct subprocess_info *call_usermodehel
- }
- EXPORT_SYMBOL(call_usermodehelper_setup);
-
-+int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info,
-+ struct file **filp)
-+{
-+ struct file *f[2];
-+
-+ if (create_pipe_files(f, 0)<0)
-+ return PTR_ERR(f);
-+ sub_info->stdout = f[1];
-+ *filp = f[0];
-+ return 0;
-+}
-+EXPORT_SYMBOL(call_usermodehelper_stdoutpipe);
-+
-+
- /**
- * call_usermodehelper_exec - start a usermode application
- * @sub_info: information about the subprocessa
+++ /dev/null
-===============================================================================
-
-This patch makes MAC addresses of network interfaces predictable. In
-particular, it adds a small routine that computes MAC addresses of based on
-a SHA1 hash of the virtual machine name and interface ID.
-
-TECHNICAL INFORMATION:
-
-Applies to vanilla kernel 3.9.4.
-
-===============================================================================
---- a/arch/um/Kconfig.net
-+++ b/arch/um/Kconfig.net
-@@ -21,6 +21,19 @@ config UML_NET
- enable at least one of the following transport options to actually
- make use of UML networking.
-
-+config UML_NET_RANDOM_MAC
-+ bool "Use random MAC addresses for network interfaces"
-+ default n
-+ depends on UML_NET
-+ help
-+ Virtual network devices inside a User-Mode Linux instance must be
-+ assigned a MAC (Ethernet) address. If none is specified on the UML
-+ command line, one must be automatically computed. If this option is
-+ enabled, a randomly generated address is used. Otherwise, if this
-+ option is disabled, the address is generated from a SHA1 hash of
-+ the umid of the UML instance and the interface name. The latter choice
-+ is useful to make MAC addresses predictable.
-+
- config UML_NET_ETHERTAP
- bool "Ethertap transport"
- depends on UML_NET
---- a/arch/um/drivers/net_kern.c
-+++ b/arch/um/drivers/net_kern.c
-@@ -25,6 +25,13 @@
- #include <net_kern.h>
- #include <net_user.h>
-
-+#include <crypto/sha.h>
-+#include <linux/string.h>
-+#include <linux/crypto.h>
-+#include <linux/err.h>
-+#include <linux/scatterlist.h>
-+#include "os.h"
-+
- #define DRIVER_NAME "uml-netdev"
-
- static DEFINE_SPINLOCK(opened_lock);
-@@ -295,11 +302,47 @@ static void uml_net_user_timer_expire(un
- #endif
- }
-
-+#ifndef CONFIG_UML_NET_RANDOM_MAC
-+
-+/* Compute a SHA1 hash of the UML instance's id and
-+ * * an interface name. */
-+static int compute_hash(const char *umid, const char *ifname, char *hash) {
-+ char vmif[1024];
-+ struct scatterlist sg;
-+ struct crypto_hash *tfm;
-+ struct hash_desc desc;
-+
-+ strcpy (vmif, umid);
-+ strcat (vmif, ifname);
-+
-+ tfm = crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC);
-+ if (IS_ERR(tfm))
-+ return 1;
-+
-+ desc.tfm = tfm;
-+ desc.flags = 0;
-+
-+ sg_init_table(&sg, 1);
-+ sg_set_buf(&sg, vmif, strlen(vmif));
-+
-+ if (crypto_hash_digest(&desc, &sg, strlen(vmif), hash)) {
-+ crypto_free_hash(tfm);
-+ return 1;
-+ }
-+
-+ crypto_free_hash(tfm);
-+
-+ return 0;
-+}
-+
-+#endif
-+
- static void setup_etheraddr(struct net_device *dev, char *str)
- {
- unsigned char *addr = dev->dev_addr;
- char *end;
- int i;
-+ u8 hash[SHA1_DIGEST_SIZE];
-
- if (str == NULL)
- goto random;
-@@ -340,9 +383,26 @@ static void setup_etheraddr(struct net_d
- return;
-
- random:
-+#ifdef CONFIG_UML_NET_RANDOM_MAC
- printk(KERN_INFO
- "Choosing a random ethernet address for device %s\n", dev->name);
- eth_hw_addr_random(dev);
-+#else
-+ printk(KERN_INFO
-+ "Computing a digest to use as ethernet address for device %s\n", dev->name);
-+ if (compute_hash(get_umid(), dev->name, hash)) {
-+ printk(KERN_WARNING
-+ "Could not compute digest to use as ethernet address for device %s. "
-+ "Using random address instead.\n", dev->name);
-+ random_ether_addr(addr);
-+ }
-+ else {
-+ for (i=0; i < 6; i++)
-+ addr[i] = (hash[i] + hash[i+6]) % 0x100;
-+ }
-+ addr [0] &= 0xfe; /* clear multicast bit */
-+ addr [0] |= 0x02; /* set local assignment bit (IEEE802) */
-+#endif
- }
-
- static DEFINE_SPINLOCK(devices_lock);
projects / openwrt / staging / zorun.git / commitdiff