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Commit 586ce098 authored by Al Viro's avatar Al Viro
Browse files

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: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 91797466

fs/compat.c

+6 −2
Original line number Diff line number Diff line
@@ -1228,6 +1228,8 @@ compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec, 
	file = fget_light(fd, &fput_needed);

	if (!file)

		return -EBADF;

	ret = -ESPIPE;

	if (file->f_mode & FMODE_PREAD)

		ret = compat_readv(file, vec, vlen, &pos);

	fput_light(file, fput_needed);

	return ret;
@@ -1285,6 +1287,8 @@ compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec, 
	file = fget_light(fd, &fput_needed);

	if (!file)

		return -EBADF;

	ret = -ESPIPE;

	if (file->f_mode & FMODE_PWRITE)

		ret = compat_writev(file, vec, vlen, &pos);

	fput_light(file, fput_needed);

	return ret;