fs/compat: fix parameter handling for compat readv/writev syscalls

We got a report that the pwritev syscall does not work correctly in
compat mode on s390.

It turned out that with commit 72ec35163f9f ("switch compat readv/writev
variants to COMPAT_SYSCALL_DEFINE") we lost the zero extension of a
couple of syscall parameters because the some parameter types haven't
been converted from unsigned long to compat_ulong_t.

This is needed 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@de.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: <stable@vger.kernel.org>	[v3.10+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/read_write.c b/fs/read_write.c
index 1193ffd0356547b63cdf0a503a2eb68ae84d8ba6..edc5746a902a090ce4dbda6b8b1205e729dff5b3 100644 (file)
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -964,9 +964,9 @@ out:
        return ret;
 }
 
-COMPAT_SYSCALL_DEFINE3(readv, unsigned long, fd,
+COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd,
                const struct compat_iovec __user *,vec,
-               unsigned long, vlen)
+               compat_ulong_t, vlen)
 {
        struct fd f = fdget(fd);
        ssize_t ret;
@@ -1001,9 +1001,9 @@ COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd,
        return ret;
 }
 
-COMPAT_SYSCALL_DEFINE5(preadv, unsigned long, fd,
+COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd,
                const struct compat_iovec __user *,vec,
-               unsigned long, vlen, u32, pos_low, u32, pos_high)
+               compat_ulong_t, vlen, u32, pos_low, u32, pos_high)
 {
        loff_t pos = ((loff_t)pos_high << 32) | pos_low;
        return compat_sys_preadv64(fd, vec, vlen, pos);
@@ -1031,9 +1031,9 @@ out:
        return ret;
 }
 
-COMPAT_SYSCALL_DEFINE3(writev, unsigned long, fd,
+COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd,
                const struct compat_iovec __user *, vec,
-               unsigned long, vlen)
+               compat_ulong_t, vlen)
 {
        struct fd f = fdget(fd);
        ssize_t ret;
@@ -1068,9 +1068,9 @@ COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd,
        return ret;
 }
 
-COMPAT_SYSCALL_DEFINE5(pwritev, unsigned long, fd,
+COMPAT_SYSCALL_DEFINE5(pwritev, compat_ulong_t, fd,
                const struct compat_iovec __user *,vec,
-               unsigned long, vlen, u32, pos_low, u32, pos_high)
+               compat_ulong_t, vlen, u32, pos_low, u32, pos_high)
 {
        loff_t pos = ((loff_t)pos_high << 32) | pos_low;
        return compat_sys_pwritev64(fd, vec, vlen, pos);

diff --git a/include/linux/compat.h b/include/linux/compat.h
index eb8a49d75ab3155bb6910eab585e5dfed9f64dee..c5642b83e02b9633317617a0c7841a51b2949b24 100644 (file)
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -327,16 +327,16 @@ asmlinkage long compat_sys_keyctl(u32 option,
                              u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 
-asmlinkage ssize_t compat_sys_readv(unsigned long fd,
-               const struct compat_iovec __user *vec, unsigned long vlen);
-asmlinkage ssize_t compat_sys_writev(unsigned long fd,
-               const struct compat_iovec __user *vec, unsigned long vlen);
-asmlinkage ssize_t compat_sys_preadv(unsigned long fd,
+asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
+               const struct compat_iovec __user *vec, compat_ulong_t vlen);
+asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
+               const struct compat_iovec __user *vec, compat_ulong_t vlen);
+asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
                const struct compat_iovec __user *vec,
-               unsigned long vlen, u32 pos_low, u32 pos_high);
-asmlinkage ssize_t compat_sys_pwritev(unsigned long fd,
+               compat_ulong_t vlen, u32 pos_low, u32 pos_high);
+asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
                const struct compat_iovec __user *vec,
-               unsigned long vlen, u32 pos_low, u32 pos_high);
+               compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 asmlinkage long comat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 
 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,