Messages in this thread Patch in this message | | | Date | Wed, 26 Apr 2006 16:50:05 +0900 | From | Masami Hiramatsu <> | Subject | [PATCH] kprobe: fix resume execution on i386 |
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Hi, Andrew
Here is a patch to fix resume_execution() to handle iret and absolute jump opcode correctly on i386. This patch can be applied against 2.6.17-rc2.
Best regards, -- Masami HIRAMATSU 2nd Research Dept. Hitachi, Ltd., Systems Development Laboratory E-mail: hiramatu@sdl.hitachi.co.jp
Signed-off-by: Masami Hiramatsu <hiramatu@sdl.hitachi.co.jp> kprobes.c | 14 +++++++++----- 1 files changed, 9 insertions(+), 5 deletions(-) diff -Narup a/arch/i386/kernel/kprobes.c b/arch/i386/kernel/kprobes.c --- a/arch/i386/kernel/kprobes.c 2006-04-21 12:23:45.000000000 +0900 +++ b/arch/i386/kernel/kprobes.c 2006-04-21 21:26:51.000000000 +0900 @@ -452,10 +452,11 @@ static void __kprobes resume_execution(s *tos &= ~(TF_MASK | IF_MASK); *tos |= kcb->kprobe_old_eflags; break; - case 0xc3: /* ret/lret */ - case 0xcb: - case 0xc2: + case 0xc2: /* iret/ret/lret */ + case 0xc3: case 0xca: + case 0xcb: + case 0xcf: case 0xea: /* jmp absolute -- eip is correct */ /* eip is already adjusted, no more changes required */ p->ainsn.boostable = 1; @@ -463,10 +464,13 @@ static void __kprobes resume_execution(s case 0xe8: /* call relative - Fix return addr */ *tos = orig_eip + (*tos - copy_eip); break; + case 0x9a: /* call absolute -- same as call absolute, indirect */ + *tos = orig_eip + (*tos - copy_eip); + goto no_change; case 0xff: if ((p->ainsn.insn[1] & 0x30) == 0x10) { - /* call absolute, indirect */ - /* + /* + * call absolute, indirect * Fix return addr; eip is correct. * But this is not boostable */
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