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Groups > linux.kernel > #1565706
| From | Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 4.4 31/42] arm64/ptrace: Preserve previous registers for short regset write - 2 |
| Date | 2017-01-24 09:40 +0100 |
| Message-ID | <t34O0-1Xv-73@gated-at.bofh.it> (permalink) |
| References | <t34bf-1t2-13@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dave Martin <Dave.Martin@arm.com>
commit 9dd73f72f218320c6c90da5f834996e7360dc227 upstream.
Ensure that if userspace supplies insufficient data to
PTRACE_SETREGSET to fill all the registers, the thread's old
registers are preserved.
Fixes: 766a85d7bc5d ("arm64: ptrace: add NT_ARM_SYSTEM_CALL regset")
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Will Deacon <Will.Deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/arm64/kernel/ptrace.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -576,7 +576,8 @@ static int system_call_set(struct task_s
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
- int syscallno, ret;
+ int syscallno = task_pt_regs(target)->syscallno;
+ int ret;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &syscallno, 0, -1);
if (ret)
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[PATCH 4.4 00/42] 4.4.45-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 02/42] IB/mlx5: Wait for all async command completions to complete Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 29/42] ARM: dts: da850-evm: fix read access to SPI flash Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 05/42] IB/mlx4: Fix port query for 56Gb Ethernet links Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 09/42] ARM: dts: imx31: fix clock control module interrupts description Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 37/42] ARM: 8613/1: Fix the uaccess crash on PB11MPCore Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 32/42] arm64/ptrace: Preserve previous registers for short regset write - 3 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 35/42] ARM: dts: imx6qdl-nitrogen6_max: fix sgtl5000 pinctrl init Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 14/42] svcrpc: dont leak contexts on PROC_DESTROY Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 24/42] ubifs: Fix journal replay wrt. xattr nodes Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 03/42] IB/mlx4: Set traffic class in AH Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 42/42] arm64: avoid returning from bad_mode Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 39/42] [media] ite-cir: initialize use_demodulator before using it Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 28/42] ceph: fix bad endianness handling in parse_reply_info_extra Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 31/42] arm64/ptrace: Preserve previous registers for short regset write - 2 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 34/42] arm64/ptrace: Reject attempts to set incomplete hardware breakpoint fields Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:40 +0100 [PATCH 4.4 16/42] PCI: Enumerate switches below PCI-to-PCIe bridges Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-24 09:50 +0100 Re: [PATCH 4.4 00/42] 4.4.45-stable review Shuah Khan <shuah.kh@samsung.com> - 2017-01-24 19:30 +0100 Re: [PATCH 4.4 00/42] 4.4.45-stable review Guenter Roeck <linux@roeck-us.net> - 2017-01-24 20:10 +0100
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