Le 08/01/2019 à 19:49, Peter Maydell a écrit : > Linux returns success if pwrite64() or pread64() are called with a > zero length NULL buffer, but QEMU was returning -TARGET_EFAULT. > > This is the same bug that we fixed in commit 58cfa6c2e6eb51b23cc9 > for the write syscall, and long before that in 38d840e6790c29f59 > for the read syscall. > > Fixes: https://bugs.launchpad.net/qemu/+bug/1810433 > > Signed-off-by: Peter Maydell <peter.mayd...@linaro.org> > --- > I chose to fix this by setting p to NULL and falling through > to the normal-case codepath rather than having a call to > pread/pwrite in the special-case if like 58cfa6c2e6eb5, > because here the normal-case is a bit more complicated as > it has the target_offset64() call in it. > 38d840e6790c29f59 has "just return 0" for the NULL buffer > case, but we can't do that here as that would not get the > "negative offset should return -EINVAL" case write. > --- > linux-user/syscall.c | 22 ++++++++++++++++++---- > 1 file changed, 18 insertions(+), 4 deletions(-) >
Reviewed-by: Laurent Vivier <laur...@vivier.eu>
