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| author | Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2022-02-14 16:11:37 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-03-08 00:04:57 +1100 |
| commit | 0ffdbce6f4a89bb7c0002904d6438ec83cf05ce7 (patch) | |
| tree | e88144eb98064f6eda5a1cd6fae4fa41d0f56c5c /arch/powerpc/net/bpf_jit.h | |
| parent | bafb5898de5d2f15133774cb049fe55720b9c92f (diff) | |
| download | linux-0ffdbce6f4a89bb7c0002904d6438ec83cf05ce7.tar.gz linux-0ffdbce6f4a89bb7c0002904d6438ec83cf05ce7.tar.bz2 linux-0ffdbce6f4a89bb7c0002904d6438ec83cf05ce7.zip | |
powerpc/bpf: Handle large branch ranges with BPF_EXIT
In some scenarios, it is possible that the program epilogue is outside
the branch range for a BPF_EXIT instruction. Instead of rejecting such
programs, emit epilogue as an alternate exit point from the program.
Track the location of the same so that subsequent exits can take either
of the two paths.
Reported-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/33aa2e92645a92712be23b18035a2c6dcb92ff8d.1644834730.git.naveen.n.rao@linux.vnet.ibm.com
Diffstat (limited to 'arch/powerpc/net/bpf_jit.h')
| -rw-r--r-- | arch/powerpc/net/bpf_jit.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h index 25a7190bcee9..e58cf29bb0cf 100644 --- a/arch/powerpc/net/bpf_jit.h +++ b/arch/powerpc/net/bpf_jit.h @@ -148,6 +148,7 @@ struct codegen_context { unsigned int stack_size; int b2p[ARRAY_SIZE(b2p)]; unsigned int exentry_idx; + unsigned int alt_exit_addr; }; #ifdef CONFIG_PPC32 @@ -183,6 +184,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context * void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx); void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx); void bpf_jit_realloc_regs(struct codegen_context *ctx); +int bpf_jit_emit_exit_insn(u32 *image, struct codegen_context *ctx, int tmp_reg, long exit_addr); int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, int pass, struct codegen_context *ctx, int insn_idx, int jmp_off, int dst_reg); |