[CVE-2009-0029] System call wrapper special cases
System calls with an unsigned long long argument can't be converted with
the standard wrappers since that would include a cast to long, which in
turn means that we would lose the upper 32 bit on 32 bit architectures.
Also semctl can't use the standard wrapper since it has a 'union'
parameter.
So we handle them as special case and add some extra wrappers instead.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
diff --git a/fs/read_write.c b/fs/read_write.c
index 940367f..7a8326b 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -403,8 +403,8 @@
return ret;
}
-asmlinkage long sys_pread64(unsigned int fd, char __user *buf,
- size_t count, loff_t pos)
+SYSCALL_DEFINE(pread64)(unsigned int fd, char __user *buf,
+ size_t count, loff_t pos)
{
struct file *file;
ssize_t ret = -EBADF;
@@ -423,9 +423,17 @@
return ret;
}
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_pread64(long fd, long buf, long count, loff_t pos)
+{
+ return SYSC_pread64((unsigned int) fd, (char __user *) buf,
+ (size_t) count, pos);
+}
+SYSCALL_ALIAS(sys_pread64, SyS_pread64);
+#endif
-asmlinkage long sys_pwrite64(unsigned int fd, const char __user *buf,
- size_t count, loff_t pos)
+SYSCALL_DEFINE(pwrite64)(unsigned int fd, const char __user *buf,
+ size_t count, loff_t pos)
{
struct file *file;
ssize_t ret = -EBADF;
@@ -444,6 +452,14 @@
return ret;
}
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_pwrite64(long fd, long buf, long count, loff_t pos)
+{
+ return SYSC_pwrite64((unsigned int) fd, (const char __user *) buf,
+ (size_t) count, pos);
+}
+SYSCALL_ALIAS(sys_pwrite64, SyS_pwrite64);
+#endif
/*
* Reduce an iovec's length in-place. Return the resulting number of segments