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authorAl Viro <viro@zeniv.linux.org.uk>2011-03-13 01:50:58 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2011-03-13 19:21:26 -0400
commit586ce098a23b6ab7383df853a84ae3d48dc889aa (patch)
tree14092479a77973596686554b3159d4630df6a6a4 /fs/compat.c
parent9179746652faf0aba07b8b7f770dcf29892a24c6 (diff)
downloadlinux-586ce098a23b6ab7383df853a84ae3d48dc889aa.tar.gz
compat breakage in preadv() and pwritev()
Fix for a dumb preadv()/pwritev() compat bug - unlike the native variants, compat_... ones forget to check FMODE_P{READ,WRITE}, so e.g. on pipe the native preadv() will fail with -ESPIPE and compat one will act as readv() and succeed. Not critical, but it's a clear bug with trivial fix. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/compat.c')
-rw-r--r--fs/compat.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/compat.c b/fs/compat.c
index f6fd0a00e6c..691c3fd8ce1 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1228,7 +1228,9 @@ compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
file = fget_light(fd, &fput_needed);
if (!file)
return -EBADF;
- ret = compat_readv(file, vec, vlen, &pos);
+ ret = -ESPIPE;
+ if (file->f_mode & FMODE_PREAD)
+ ret = compat_readv(file, vec, vlen, &pos);
fput_light(file, fput_needed);
return ret;
}
@@ -1285,7 +1287,9 @@ compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
file = fget_light(fd, &fput_needed);
if (!file)
return -EBADF;
- ret = compat_writev(file, vec, vlen, &pos);
+ ret = -ESPIPE;
+ if (file->f_mode & FMODE_PWRITE)
+ ret = compat_writev(file, vec, vlen, &pos);
fput_light(file, fput_needed);
return ret;
}