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Merge branch 'userns-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

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Pull namespace fixes from Eric Biederman:
 "This is a set of four fairly obvious bug fixes:

   - a switch from d_find_alias to d_find_any_alias because the xattr
     code perversely takes a dentry

   - two mutex vs copy_to_user fixes from Jann Horn

   - a fix to use a sanitized size not the size userspace passed in from
     Christian Brauner"

* 'userns-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  getxattr: use correct xattr length
  sys: don't hold uts_sem while accessing userspace memory
  userns: move user access out of the mutex
  cap_inode_getsecurity: use d_find_any_alias() instead of d_find_alias()
This commit is contained in:
Linus Torvalds
2018-08-24 09:25:39 -07:00
parent 5e8704ac1c 82c9a927bc
commit 4def196360
8 changed files with 133 additions and 128 deletions
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51
arch/alpha/kernel/osf_sys.c
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@@ -530,24 +530,19 @@ SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path,
SYSCALL_DEFINE1(osf_utsname, char __user *, name)
{
int error;
char tmp[5 * 32];
down_read(&uts_sem);
error = -EFAULT;
if (copy_to_user(name + 0, utsname()->sysname, 32))
goto out;
if (copy_to_user(name + 32, utsname()->nodename, 32))
goto out;
if (copy_to_user(name + 64, utsname()->release, 32))
goto out;
if (copy_to_user(name + 96, utsname()->version, 32))
goto out;
if (copy_to_user(name + 128, utsname()->machine, 32))
goto out;
memcpy(tmp + 0 * 32, utsname()->sysname, 32);
memcpy(tmp + 1 * 32, utsname()->nodename, 32);
memcpy(tmp + 2 * 32, utsname()->release, 32);
memcpy(tmp + 3 * 32, utsname()->version, 32);
memcpy(tmp + 4 * 32, utsname()->machine, 32);
up_read(&uts_sem);
error = 0;
out:
up_read(&uts_sem);
return error;
if (copy_to_user(name, tmp, sizeof(tmp)))
return -EFAULT;
return 0;
}
SYSCALL_DEFINE0(getpagesize)
@@ -567,18 +562,21 @@ SYSCALL_DEFINE2(osf_getdomainname, char __user *, name, int, namelen)
{
int len, err = 0;
char *kname;
char tmp[32];
if (namelen > 32)
if (namelen < 0 || namelen > 32)
namelen = 32;
down_read(&uts_sem);
kname = utsname()->domainname;
len = strnlen(kname, namelen);
if (copy_to_user(name, kname, min(len + 1, namelen)))
err = -EFAULT;
len = min(len + 1, namelen);
memcpy(tmp, kname, len);
up_read(&uts_sem);
return err;
if (copy_to_user(name, tmp, len))
return -EFAULT;
return 0;
}
/*
@@ -739,13 +737,14 @@ SYSCALL_DEFINE3(osf_sysinfo, int, command, char __user *, buf, long, count)
};
unsigned long offset;
const char *res;
long len, err = -EINVAL;
long len;
char tmp[__NEW_UTS_LEN + 1];
offset = command-1;
if (offset >= ARRAY_SIZE(sysinfo_table)) {
/* Digital UNIX has a few unpublished interfaces here */
printk("sysinfo(%d)", command);
goto out;
return -EINVAL;
}
down_read(&uts_sem);
@@ -753,13 +752,11 @@ SYSCALL_DEFINE3(osf_sysinfo, int, command, char __user *, buf, long, count)
len = strlen(res)+1;
if ((unsigned long)len > (unsigned long)count)
len = count;
if (copy_to_user(buf, res, len))
err = -EFAULT;
else
err = 0;
memcpy(tmp, res, len);
up_read(&uts_sem);
out:
return err;
if (copy_to_user(buf, tmp, len))
return -EFAULT;
return 0;
}
SYSCALL_DEFINE5(osf_getsysinfo, unsigned long, op, void __user *, buffer,