Code processing apparatus and computer program product
According to an embodiment, a code processing apparatus includes a determining unit, a concealing unit, an instructing unit, and an unconcealing unit. The determining unit is configured to determine, based on relocation information included in first code data that includes a code body and relocation information representing a portion of the code body to be relocated by a linker, a first portion including at least a part of the code body that is other than the portion. The concealing unit is configured to conceal the first portion. The instructing unit is configured to instruct the linker to process the first code data having the first portion concealed. The unconcealing unit is configured to unconceal the concealed portion of second code data that is generated from the first code data by the linker.
1. A code processing apparatus comprising:
processing circuitry configured to:
determine, based on relocation information included in first code data that includes a pre-linked code body and relocation information representing a portion of the code body to be relocated by a linker, a first portion including at least a part of the code body excluding the portion which the linker rewrites along with relocation;
conceal the first portion of a pre-linked code body included in the first code data before the linker performs relocation;
instruct the linker to process the first code data having the first portion concealed;
unconceal the concealed portion of second code data that is generated from the first code data by the linker; and
identify a position of the concealed portion of the second code data based on symbol information output from the linker and a symbol indicating a position in the code body, and unconceals the identified concealed portion.
2. The code processing apparatus according to claim 1 , wherein the processing circuitry is further configured to:
acquire an unconcealing code for unconcealing the concealed portion, and
unconceal the concealed portion of the second code data using the acquired unconcealing code.
3. The code processing apparatus according to claim 2 , wherein the processing circuitry is further configured to:
conceal the first portion by replacing an original code of the first portion with a dummy code, and
acquire the original code from the first code data as the unconcealing code.
4. The code processing apparatus according to claim 2 , wherein the processing circuitry is further configured to:
conceal the first portion by encrypting an original code of the first portion, and
acquire the unconcealing code by decrypting the concealed portion of the second code data.
5. The code processing apparatus according to claim 1 , wherein the processing circuitry is further configured to:
determine a concealing method based on the relocation information, and
conceal the first portion using the concealing method determined by the determining.
6. The code processing apparatus according to claim 1 , wherein processing circuitry is further configured to:
record a unique tag for identification to a part of the first portion, and
identify a position of the concealed portion of the second code data based on the tag, and unconceals the identified concealed portion.
7. The code processing apparatus according to claim 1 , wherein the processing circuitry is further configured to:
receive the first code data under protection from another apparatus and remove the protection, and
determine the first portion based on the relocation information included in the first code data having the protection removed.
8. The code processing apparatus according to claim 7 , wherein the processing circuitry is further configured to:
receive one piece into which a plurality of pieces of first code data having been merged, and
separate the one piece into the pieces of first code data.
9. The code processing apparatus according to claim 1 , wherein the processing circuitry is further configured to:
output the second code data with the concealed portion unconcealed under protection.
10. The code processing apparatus according to claim 9 , wherein the processing circuitry is further configured to:
merge a plurality of pieces of second code data having the concealed portion unconcealed into one piece, and
output the one piece into which the pieces of second code data are merged under protection.
11. A code processing apparatus comprising:
processing circuitry configured to:
acquire a pre-linked concealed code that conceals a first portion of a pre-linked code body and a protected unconcealing code for unconcealing the first portion, the pre-linked concealed code and the protected unconcealing code being output from another apparatus;
instruct a linker to perform processing with respect to the acquired pre-linked concealed code;
unconceal the concealed portion of second code data generated from the first code data by the linker using the acquired protected unconcealing code; and
identify a position of the concealed portion of the second code data based on symbol information output from the linker and a symbol indicating a position in the code body, and unconceals the identified concealed portion.
12. A computer program product comprising a non-transitory computer-readable medium containing a program executed by a computer, the program causing the computer to execute:
determining, based on relocation information included in first code data that includes a pre-linked code body and relocation information representing a portion of the code body to be relocated by a linker, a first portion including at least a part of the code body excluding the portion which the linker rewrites along with relocation;
concealing the first portion of the pre-linked code body included in the first code data before the linker performs relocation;
instructing the linker to process the first code data having the first portion concealed;
unconcealing the concealed portion of second code data that is generated the first code data by the linker; and
identify a position of the concealed portion of the second code data based on symbol information output from the linker and a symbol indicating a position in the code body, and unconceals the identified concealed portion.
13. A computer program product comprising a non-transitory computer-readable medium containing a program executed by a computer, the program causing the computer to execute:
acquiring a pre-linked concealed code that conceals a first portion of a pre-linked code body and a protected unconcealing code for unconcealing the first portion, the pre-linked concealed code and the protected unconcealing code being output from another apparatus;
instructing a linker to perform processing with respect to the acquired pre-linked concealed code;
unconcealing the concealed portion of second code data generated from the first code data by the linker using the acquired protected unconcealing code; and
identifying a position of the concealed portion of the second code data based on symbol information output from the linker and a symbol indicating a position in the code body, and unconcealing the identified concealed portion.
14. A code processing apparatus comprising:
processing circuitry configured to:
determine, based on relocation information included in first code data that includes a pre-linked code body and relocation information representing a portion of the code body to be relocated by a linker, a first portion including at least a part of the code body excluding the portion which the linker rewrites along with relocation;
conceal the first portion of a pre-linked code body included in the first code data before the linker performs relocation;
instruct the linker to process the first code data having the first portion concealed;
unconceal the concealed portion of second code data that is generated from the first code data by the linker;
record a unique tag for identification to a part of the first portion; and
identify a position of the concealed portion of the second code data based on the tag, and unconceals the identified concealed portion.