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authorHeiko Carstens <heiko.carstens@de.ibm.com>2009-01-14 14:14:02 +0100
committerHeiko Carstens <heiko.carstens@de.ibm.com>2009-01-14 14:15:18 +0100
commit6673e0c3fbeaed2cd08e2fd4a4aa97382d6fedb0 (patch)
treeeb33a94f5e4b0e035001f7c96ef44cade0fbb489 /mm
parented6bb6194350dc6ae97a65dbf2d621a3dbe6bbe9 (diff)
downloadlinux-6673e0c3fbeaed2cd08e2fd4a4aa97382d6fedb0.tar.gz
[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>
Diffstat (limited to 'mm')
-rw-r--r--mm/fadvise.c18
-rw-r--r--mm/filemap.c9
2 files changed, 24 insertions, 3 deletions
diff --git a/mm/fadvise.c b/mm/fadvise.c
index a1da969bd98..54a0f8040af 100644
--- a/mm/fadvise.c
+++ b/mm/fadvise.c
@@ -24,7 +24,7 @@
* POSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could
* deactivate the pages and clear PG_Referenced.
*/
-asmlinkage long sys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice)
+SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
{
struct file *file = fget(fd);
struct address_space *mapping;
@@ -126,12 +126,26 @@ out:
fput(file);
return ret;
}
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_fadvise64_64(long fd, loff_t offset, loff_t len, long advice)
+{
+ return SYSC_fadvise64_64((int) fd, offset, len, (int) advice);
+}
+SYSCALL_ALIAS(sys_fadvise64_64, SyS_fadvise64_64);
+#endif
#ifdef __ARCH_WANT_SYS_FADVISE64
-asmlinkage long sys_fadvise64(int fd, loff_t offset, size_t len, int advice)
+SYSCALL_DEFINE(fadvise64)(int fd, loff_t offset, size_t len, int advice)
{
return sys_fadvise64_64(fd, offset, len, advice);
}
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_fadvise64(long fd, loff_t offset, long len, long advice)
+{
+ return SYSC_fadvise64((int) fd, offset, (size_t)len, (int)advice);
+}
+SYSCALL_ALIAS(sys_fadvise64, SyS_fadvise64);
+#endif
#endif
diff --git a/mm/filemap.c b/mm/filemap.c
index 538b75ed623..23acefe5180 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1374,7 +1374,7 @@ do_readahead(struct address_space *mapping, struct file *filp,
return 0;
}
-asmlinkage long sys_readahead(int fd, loff_t offset, size_t count)
+SYSCALL_DEFINE(readahead)(int fd, loff_t offset, size_t count)
{
ssize_t ret;
struct file *file;
@@ -1393,6 +1393,13 @@ asmlinkage long sys_readahead(int fd, loff_t offset, size_t count)
}
return ret;
}
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_readahead(long fd, loff_t offset, long count)
+{
+ return SYSC_readahead((int) fd, offset, (size_t) count);
+}
+SYSCALL_ALIAS(sys_readahead, SyS_readahead);
+#endif
#ifdef CONFIG_MMU
/**