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bpf: Comment on check_mem_size_reg

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This patch adds a comment to check_mem_size_reg -- a function whose
meaning is not very transparent. The function implicitly deals with two
registers connected by convention, which is not obvious.

Signed-off-by: Andrei Matei <andreimatei1@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20231210225149.67639-1-andreimatei1@gmail.com
This commit is contained in:
Andrei Matei 2023-12-10 17:51:50 -05:00 committed by Andrii Nakryiko
parent 56c26d5ad8
commit 745e031130
1 changed files with 6 additions and 0 deletions
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6
kernel/bpf/verifier.c
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@ -7256,6 +7256,12 @@ static int check_helper_mem_access(struct bpf_verifier_env *env, int regno,
}
}
/* verify arguments to helpers or kfuncs consisting of a pointer and an access
* size.
*
* @regno is the register containing the access size. regno-1 is the register
* containing the pointer.
*/
static int check_mem_size_reg(struct bpf_verifier_env *env,
struct bpf_reg_state *reg, u32 regno,
bool zero_size_allowed,