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[v2] powerpc/bpf: populate extable entries only during the last pass

Message ID 20230425065829.18189-1-hbathini@linux.ibm.com (mailing list archive)
State Not Applicable
Delegated to: BPF
Headers show
Series [v2] powerpc/bpf: populate extable entries only during the last pass | expand

Checks

Context Check Description
netdev/tree_selection success Not a local patch
bpf/vmtest-bpf-next-PR pending PR summary
bpf/vmtest-bpf-next-VM_Test-1 success Logs for ShellCheck
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bpf/vmtest-bpf-next-VM_Test-10 pending Logs for test_maps on s390x with gcc
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bpf/vmtest-bpf-next-VM_Test-33 pending Logs for test_verifier on s390x with gcc
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bpf/vmtest-bpf-next-VM_Test-35 success Logs for test_verifier on x86_64 with llvm-16

Commit Message

Hari Bathini April 25, 2023, 6:58 a.m. UTC 
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@vger.kernel.org
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
---
 arch/powerpc/net/bpf_jit_comp.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Naveen N. Rao April 25, 2023, 2:36 p.m. UTC | #1 
Hari Bathini wrote:
> 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@vger.kernel.org
> Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
> ---
>  arch/powerpc/net/bpf_jit_comp.c | 2 ++
>  1 file changed, 2 insertions(+)

Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>


- Naveen

> 
> diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
> index e93aefcfb83f..37043dfc1add 100644
> --- 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(struct bpf_prog *fp)
>  		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;
>  	}
>  
> -- 
> 2.40.0
> 
>
Michael Ellerman July 3, 2023, 5:21 a.m. UTC | #2 
On Tue, 25 Apr 2023 12:28:29 +0530, Hari Bathini wrote:
> 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.
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/bpf: populate extable entries only during the last pass
      https://git.kernel.org/powerpc/c/35a4b8ce4ac00e940b46b1034916ccb22ce9bdef

cheers
diff mbox series

Patch

diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index e93aefcfb83f..37043dfc1add 100644
--- 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(struct bpf_prog *fp)
 		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;
 	}