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btf: Protect BTF_KIND_INFO against invalid kind

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If the user provides a kind value that is more than 5 bits, the
BTF_KIND_INFO macro would emit incorrect values for info (by clobbering
values of the kind flag).

Tested on x86_64-redhat-linux.

include/ChangeLog:

	* btf.h (BTF_TYPE_INFO): Protect against user providing invalid
	kind.

Signed-off-by: Will Hawkins <hawkinsw@obs.cr>
This commit is contained in:
Will Hawkins 2024-07-29 10:42:48 -04:00 committed by David Faust
parent 786ebbd605
commit d0bc1cbf6a
1 changed files with 2 additions and 2 deletions
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4
include/btf.h
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@ -82,7 +82,7 @@ struct btf_type
};
};
/* The folloing macros access the information encoded in btf_type.info. */
/* The following macros access the information encoded in btf_type.info. */
/* Type kind. See below. */
#define BTF_INFO_KIND(info) (((info) >> 24) & 0x1f)
/* Number of entries of variable length data following certain type kinds.
@ -95,7 +95,7 @@ struct btf_type
/* Encoding for struct btf_type.info. */
#define BTF_TYPE_INFO(kind, kflag, vlen) \
((((kflag) ? 1 : 0 ) << 31) | ((kind) << 24) | ((vlen) & 0xffff))
((((kflag) ? 1 : 0 ) << 31) | ((kind & 0x1f) << 24) | ((vlen) & 0xffff))
#define BTF_KIND_UNKN 0 /* Unknown or invalid. */
#define BTF_KIND_INT 1 /* Integer. */