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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2014-01-30 02:05:44 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-30 04:22:39 +0400 |
| commit | dfd948e32af2e7b28bcd7a490c0a30d4b8df2a36 (patch) | |
| tree | 41f14ee51b5d57387a425b241c67f7d33446076b /fs/read_write.c | |
| parent | 4a404bea941ac3c62e11b88c9d16197334eee2f1 (diff) | |
| download | linux-dfd948e32af2e7b28bcd7a490c0a30d4b8df2a36.tar.xz | |
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>
Diffstat (limited to 'fs/read_write.c')
| -rw-r--r-- | fs/read_write.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 1193ffd03565..edc5746a902a 100644 --- 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); |