i#7229: Fix --fsanitize=pointer-overflow reports #7234
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Adding to NULL is undefined behavior. Examples of reports are in DynamoRIO#7229. Many others are likely still undiscovered. Issue: DynamoRIO#7229
edeiana
requested changes
Feb 1, 2025
| @@ -3710,7 +3710,7 @@ sandbox_top_of_bb(dcontext_t *dcontext, instrlist_t *ilist, bool s2ro, uint flag | |||
| #endif | |||
| PRE(ilist, instr, | |||
| INSTR_CREATE_mov_imm(dcontext, opnd_create_reg(REG_XCX), | |||
| OPND_CREATE_INTPTR(end_pc - (start_pc + 1)))); | |||
| OPND_CREATE_INTPTR(end_pc - start_pc + 1))); | |||
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This should be end_pc - start_pc - 1.
It's also the cause for (at least some) Github CI tests failing/timing-out (e.g., security-common.selfmod2).
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Adding to NULL is undefined behavior.
Examples of reports are in #7229.
Many others are likely still undiscovered.
Some reports are here #7229 (comment)
Issue: #7229