This is a note to let you know that I've just added the patch titled
powerpc/bpf: populate extable entries only during the last pass
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-bpf-populate-extable-entries-only-during-the-last-pass.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 35a4b8ce4ac00e940b46b1034916ccb22ce9bdef Mon Sep 17 00:00:00 2001
From: Hari Bathini <hbathini@xxxxxxxxxxxxx>
Date: Tue, 25 Apr 2023 12:28:29 +0530
Subject: powerpc/bpf: populate extable entries only during the last pass
From: Hari Bathini <hbathini@xxxxxxxxxxxxx>
commit 35a4b8ce4ac00e940b46b1034916ccb22ce9bdef upstream.
Since commit 85e031154c7c ("powerpc/bpf: Perform complete extra passes
to update addresses"), two additional passes are performed to avoid
space and CPU time wastage on powerpc. But these extra passes led to
WARN_ON_ONCE() hits in bpf_add_extable_entry() as extable entries are
populated again, during the extra pass, without resetting the index.
Fix it by resetting entry index before repopulating extable entries,
if and when there is an additional pass.
Fixes: 85e031154c7c ("powerpc/bpf: Perform complete extra passes to update addresses")
Cc: stable@xxxxxxxxxxxxxxx # v6.3+
Signed-off-by: Hari Bathini <hbathini@xxxxxxxxxxxxx>
Reviewed-by: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://msgid.link/20230425065829.18189-1-hbathini@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/net/bpf_jit_comp.c | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -101,6 +101,8 @@ struct bpf_prog *bpf_int_jit_compile(str
bpf_hdr = jit_data->header;
proglen = jit_data->proglen;
extra_pass = true;
+ /* During extra pass, ensure index is reset before repopulating extable entries */
+ cgctx.exentry_idx = 0;
goto skip_init_ctx;
}
Patches currently in stable-queue which might be from hbathini@xxxxxxxxxxxxx are
queue-6.3/powerpc-bpf-populate-extable-entries-only-during-the-last-pass.patch
