From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Subject: fs/compat: fix lookup_dcookie() parameter handling
d5dc77bfeeab0 "consolidate compat lookup_dcookie()" coverted all
architectures to the new compat_sys_lookup_dcookie() syscall.
The "len" paramater of the new compat syscall must have the type
compat_size_t in order to enforce zero extension for architectures where
the ABI requires that the caller of a function performed zero and/or sign
extension to 64 bit of all parameters.
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Hendrik Brueckner <brueckner@xxxxxxxxxxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [v3.10+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/dcookies.c | 2 +-
include/linux/compat.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff -puN fs/dcookies.c~fs-compat-fix-lookup_dcookie-parameter-handling fs/dcookies.c
--- a/fs/dcookies.c~fs-compat-fix-lookup_dcookie-parameter-handling
+++ a/fs/dcookies.c
@@ -204,7 +204,7 @@ out:
}
#ifdef CONFIG_COMPAT
-COMPAT_SYSCALL_DEFINE4(lookup_dcookie, u32, w0, u32, w1, char __user *, buf, size_t, len)
+COMPAT_SYSCALL_DEFINE4(lookup_dcookie, u32, w0, u32, w1, char __user *, buf, compat_size_t, len)
{
#ifdef __BIG_ENDIAN
return sys_lookup_dcookie(((u64)w0 << 32) | w1, buf, len);
diff -puN include/linux/compat.h~fs-compat-fix-lookup_dcookie-parameter-handling include/linux/compat.h
--- a/include/linux/compat.h~fs-compat-fix-lookup_dcookie-parameter-handling
+++ a/include/linux/compat.h
@@ -422,7 +422,7 @@ extern long compat_arch_ptrace(struct ta
asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
compat_long_t addr, compat_long_t data);
-asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, size_t);
+asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
/*
* epoll (fs/eventpoll.c) compat bits follow ...
*/
_
--
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