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ARM: kprobes: Reject probing of LDRB instructions which load PC

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These instructions are specified as UNPREDICTABLE.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
This commit is contained in:
Jon Medhurst 2011-04-12 07:45:21 +01:00 committed by Nicolas Pitre
parent 5c6b76fc7d
commit 81ff5720b9
1 changed files with 4 additions and 0 deletions
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4
arch/arm/kernel/kprobes-decode.c
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@ -1416,6 +1416,10 @@ space_cccc_01xx(kprobe_opcode_t insn, struct arch_specific_insn *asi)
/* STRB : cccc 01xx x1x0 xxxx xxxx xxxx xxxx xxxx */
/* STRBT : cccc 01x0 x110 xxxx xxxx xxxx xxxx xxxx */
/* STRT : cccc 01x0 x010 xxxx xxxx xxxx xxxx xxxx */
if ((insn & 0x00500000) == 0x00500000 && is_r15(insn, 12))
return INSN_REJECTED; /* LDRB into PC */
return prep_emulate_ldr_str(insn, asi);
}