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bpf: Take return from set_memory_rox() into account with bpf_jit_binary_lock_ro()

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set_memory_rox() can fail, leaving memory unprotected.

Check return and bail out when bpf_jit_binary_lock_ro() returns
an error.

Link: https://github.com/KSPP/linux/issues/7
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: linux-hardening@vger.kernel.org <linux-hardening@vger.kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Puranjay Mohan <puranjay12@gmail.com>
Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>  # s390x
Acked-by: Tiezhu Yang <yangtiezhu@loongson.cn>  # LoongArch
Reviewed-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> # MIPS Part
Message-ID: <036b6393f23a2032ce75a1c92220b2afcb798d5d.1709850515.git.christophe.leroy@csgroup.eu>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Christophe Leroy
2024-03-08 06:38:08 +01:00
committed by Alexei Starovoitov
parent 7d2cc63eca
commit e60adf5132
8 changed files with 51 additions and 27 deletions
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3
arch/mips/net/bpf_jit_comp.c
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@@ -1012,7 +1012,8 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
bpf_prog_fill_jited_linfo(prog, &ctx.descriptors[1]);
/* Set as read-only exec and flush instruction cache */
bpf_jit_binary_lock_ro(header);
if (bpf_jit_binary_lock_ro(header))
goto out_err;
flush_icache_range((unsigned long)header,
(unsigned long)&ctx.target[ctx.jit_index]);