6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jiri Olsa jolsa@kernel.org
commit 088f294609d8f8816dc316681aef2eb61982e0da upstream.
If iov_iter_zero succeeds after failed copy_from_kernel_nofault, we need to reset the ret value to zero otherwise it will be returned as final return value of read_kcore_iter.
This fixes objdump -d dump over /proc/kcore for me.
Cc: stable@vger.kernel.org Cc: Alexander Gordeev agordeev@linux.ibm.com Fixes: 3d5854d75e31 ("fs/proc/kcore.c: allow translation of physical memory addresses") Signed-off-by: Jiri Olsa jolsa@kernel.org Link: https://lore.kernel.org/r/20241121231118.3212000-1-jolsa@kernel.org Acked-by: Alexander Gordeev agordeev@linux.ibm.com Signed-off-by: Christian Brauner brauner@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/proc/kcore.c | 1 + 1 file changed, 1 insertion(+)
--- a/fs/proc/kcore.c +++ b/fs/proc/kcore.c @@ -599,6 +599,7 @@ static ssize_t read_kcore_iter(struct ki ret = -EFAULT; goto out; } + ret = 0; /* * We know the bounce buffer is safe to copy from, so * use _copy_to_iter() directly.