[PATCH] fs/proc/kcore.c: Clear ret value in read_kcore_iter after successful iov_iter_zero
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 --- fs/proc/kcore.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c index 51446c59388f..c82c408e573e 100644 --- a/fs/proc/kcore.c +++ b/fs/proc/kcore.c @@ -600,6 +600,7 @@ static ssize_t read_kcore_iter(struct kiocb *iocb, struct iov_iter *iter) ret = -EFAULT; goto out; } + ret = 0; /* * We know the bounce buffer is safe to copy from, so * use _copy_to_iter() directly.
On Fri, Nov 22, 2024 at 12:11:18AM +0100, Jiri Olsa wrote:
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
fs/proc/kcore.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c index 51446c59388f..c82c408e573e 100644 --- a/fs/proc/kcore.c +++ b/fs/proc/kcore.c @@ -600,6 +600,7 @@ static ssize_t read_kcore_iter(struct kiocb *iocb, struct iov_iter *iter) ret = -EFAULT; goto out; }
ret = 0; /* * We know the bounce buffer is safe to copy from, so * use _copy_to_iter() directly.
Acked-by: Alexander Gordeev agordeev@linux.ibm.com
Thank you, Jiri!
On Fri, 22 Nov 2024 00:11:18 +0100, Jiri Olsa wrote:
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.
[...]
Applied to the vfs.fixes branch of the vfs/vfs.git tree. Patches in the vfs.fixes branch should appear in linux-next soon.
Please report any outstanding bugs that were missed during review in a new review to the original patch series allowing us to drop it.
It's encouraged to provide Acked-bys and Reviewed-bys even though the patch has now been applied. If possible patch trailers will be updated.
Note that commit hashes shown below are subject to change due to rebase, trailer updates or similar. If in doubt, please check the listed branch.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git branch: vfs.fixes
[1/1] fs/proc/kcore.c: Clear ret value in read_kcore_iter after successful iov_iter_zero https://git.kernel.org/vfs/vfs/c/088f294609d8
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Alexander Gordeev -
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Jiri Olsa