diff options
author | Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2022-04-15 19:03:43 +0300 |
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committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-04-21 17:31:10 +0300 |
commit | e9147b4422e1f35b9c229c980c596ccf03d61562 (patch) | |
tree | 6e4741901d2b8a13d4f01fc083ac64892fd2f74a /kernel/bpf | |
parent | 42ba1308074d9046386d58b56e793604be48ce22 (diff) | |
download | linux-e9147b4422e1f35b9c229c980c596ccf03d61562.tar.xz |
bpf: Move check_ptr_off_reg before check_map_access
Some functions in next patch want to use this function, and those
functions will be called by check_map_access, hence move it before
check_map_access.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Joanne Koong <joannelkoong@gmail.com>
Link: https://lore.kernel.org/bpf/20220415160354.1050687-3-memxor@gmail.com
Diffstat (limited to 'kernel/bpf')
-rw-r--r-- | kernel/bpf/verifier.c | 76 |
1 files changed, 38 insertions, 38 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 9c1a02b82ecd..71827d14724a 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -3469,6 +3469,44 @@ static int check_mem_region_access(struct bpf_verifier_env *env, u32 regno, return 0; } +static int __check_ptr_off_reg(struct bpf_verifier_env *env, + const struct bpf_reg_state *reg, int regno, + bool fixed_off_ok) +{ + /* Access to this pointer-typed register or passing it to a helper + * is only allowed in its original, unmodified form. + */ + + if (reg->off < 0) { + verbose(env, "negative offset %s ptr R%d off=%d disallowed\n", + reg_type_str(env, reg->type), regno, reg->off); + return -EACCES; + } + + if (!fixed_off_ok && reg->off) { + verbose(env, "dereference of modified %s ptr R%d off=%d disallowed\n", + reg_type_str(env, reg->type), regno, reg->off); + return -EACCES; + } + + if (!tnum_is_const(reg->var_off) || reg->var_off.value) { + char tn_buf[48]; + + tnum_strn(tn_buf, sizeof(tn_buf), reg->var_off); + verbose(env, "variable %s access var_off=%s disallowed\n", + reg_type_str(env, reg->type), tn_buf); + return -EACCES; + } + + return 0; +} + +int check_ptr_off_reg(struct bpf_verifier_env *env, + const struct bpf_reg_state *reg, int regno) +{ + return __check_ptr_off_reg(env, reg, regno, false); +} + /* check read/write into a map element with possible variable offset */ static int check_map_access(struct bpf_verifier_env *env, u32 regno, int off, int size, bool zero_size_allowed) @@ -3980,44 +4018,6 @@ static int get_callee_stack_depth(struct bpf_verifier_env *env, } #endif -static int __check_ptr_off_reg(struct bpf_verifier_env *env, - const struct bpf_reg_state *reg, int regno, - bool fixed_off_ok) -{ - /* Access to this pointer-typed register or passing it to a helper - * is only allowed in its original, unmodified form. - */ - - if (reg->off < 0) { - verbose(env, "negative offset %s ptr R%d off=%d disallowed\n", - reg_type_str(env, reg->type), regno, reg->off); - return -EACCES; - } - - if (!fixed_off_ok && reg->off) { - verbose(env, "dereference of modified %s ptr R%d off=%d disallowed\n", - reg_type_str(env, reg->type), regno, reg->off); - return -EACCES; - } - - if (!tnum_is_const(reg->var_off) || reg->var_off.value) { - char tn_buf[48]; - - tnum_strn(tn_buf, sizeof(tn_buf), reg->var_off); - verbose(env, "variable %s access var_off=%s disallowed\n", - reg_type_str(env, reg->type), tn_buf); - return -EACCES; - } - - return 0; -} - -int check_ptr_off_reg(struct bpf_verifier_env *env, - const struct bpf_reg_state *reg, int regno) -{ - return __check_ptr_off_reg(env, reg, regno, false); -} - static int __check_buffer_access(struct bpf_verifier_env *env, const char *buf_info, const struct bpf_reg_state *reg, |