Messages in this thread Patch in this message | | | Date | Fri, 04 Sep 2020 12:49:39 -0000 | From | "tip-bot2 for Vamshi K Sthambamkadi" <> | Subject | [tip: x86/urgent] tracing/kprobes, x86/ptrace: Fix regs argument order for i386 |
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The following commit has been merged into the x86/urgent branch of tip:
Commit-ID: 2356bb4b8221d7dc8c7beb810418122ed90254c9 Gitweb: https://git.kernel.org/tip/2356bb4b8221d7dc8c7beb810418122ed90254c9 Author: Vamshi K Sthambamkadi <vamshi.k.sthambamkadi@gmail.com> AuthorDate: Fri, 28 Aug 2020 17:02:46 +05:30 Committer: Borislav Petkov <bp@suse.de> CommitterDate: Fri, 04 Sep 2020 14:40:42 +02:00
tracing/kprobes, x86/ptrace: Fix regs argument order for i386
On i386, the order of parameters passed on regs is eax,edx,and ecx (as per regparm(3) calling conventions).
Change the mapping in regs_get_kernel_argument(), so that arg1=ax arg2=dx, and arg3=cx.
Running the selftests testcase kprobes_args_use.tc shows the result as passed.
Fixes: 3c88ee194c28 ("x86: ptrace: Add function argument access API") Signed-off-by: Vamshi K Sthambamkadi <vamshi.k.sthambamkadi@gmail.com> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: <stable@vger.kernel.org> Link: https://lkml.kernel.org/r/20200828113242.GA1424@cosmos --- arch/x86/include/asm/ptrace.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/ptrace.h b/arch/x86/include/asm/ptrace.h index 40aa69d..d8324a2 100644 --- a/arch/x86/include/asm/ptrace.h +++ b/arch/x86/include/asm/ptrace.h @@ -327,8 +327,8 @@ static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs, static const unsigned int argument_offs[] = { #ifdef __i386__ offsetof(struct pt_regs, ax), - offsetof(struct pt_regs, cx), offsetof(struct pt_regs, dx), + offsetof(struct pt_regs, cx), #define NR_REG_ARGUMENTS 3 #else offsetof(struct pt_regs, di),
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