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Groups > linux.kernel > #1341890

[PATCH 3.12 023/142] parisc: Fix syscall restarts

From Jiri Slaby <jslaby@suse.cz>
Newsgroups linux.kernel
Subject [PATCH 3.12 023/142] parisc: Fix syscall restarts
Date 2016-02-24 12:20 +0100
Message-ID <r5FE7-3ID-45@gated-at.bofh.it> (permalink)
References <r5Eym-2WS-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

From: Helge Deller <deller@gmx.de>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 71a71fb5374a23be36a91981b5614590b9e722c3 upstream.

On parisc syscalls which are interrupted by signals sometimes failed to
restart and instead returned -ENOSYS which in the worst case lead to
userspace crashes.
A similiar problem existed on MIPS and was fixed by commit e967ef02
("MIPS: Fix restart of indirect syscalls").

On parisc the current syscall restart code assumes that all syscall
callers load the syscall number in the delay slot of the ble
instruction. That's how it is e.g. done in the unistd.h header file:
	ble 0x100(%sr2, %r0)
	ldi #syscall_nr, %r20
Because of that assumption the current code never restored %r20 before
returning to userspace.

This assumption is at least not true for code which uses the glibc
syscall() function, which instead uses this syntax:
	ble 0x100(%sr2, %r0)
	copy regX, %r20
where regX depend on how the compiler optimizes the code and register
usage.

This patch fixes this problem by adding code to analyze how the syscall
number is loaded in the delay branch and - if needed - copy the syscall
number to regX prior returning to userspace for the syscall restart.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 arch/parisc/kernel/signal.c | 64 ++++++++++++++++++++++++++++++++++++---------
 1 file changed, 52 insertions(+), 12 deletions(-)

diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c
index 1cba8f29bb49..78bb6dd88e03 100644
--- a/arch/parisc/kernel/signal.c
+++ b/arch/parisc/kernel/signal.c
@@ -442,6 +442,55 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
 		regs->gr[28]);
 }
 
+/*
+ * Check how the syscall number gets loaded into %r20 within
+ * the delay branch in userspace and adjust as needed.
+ */
+
+static void check_syscallno_in_delay_branch(struct pt_regs *regs)
+{
+	u32 opcode, source_reg;
+	u32 __user *uaddr;
+	int err;
+
+	/* Usually we don't have to restore %r20 (the system call number)
+	 * because it gets loaded in the delay slot of the branch external
+	 * instruction via the ldi instruction.
+	 * In some cases a register-to-register copy instruction might have
+	 * been used instead, in which case we need to copy the syscall
+	 * number into the source register before returning to userspace.
+	 */
+
+	/* A syscall is just a branch, so all we have to do is fiddle the
+	 * return pointer so that the ble instruction gets executed again.
+	 */
+	regs->gr[31] -= 8; /* delayed branching */
+
+	/* Get assembler opcode of code in delay branch */
+	uaddr = (unsigned int *) ((regs->gr[31] & ~3) + 4);
+	err = get_user(opcode, uaddr);
+	if (err)
+		return;
+
+	/* Check if delay branch uses "ldi int,%r20" */
+	if ((opcode & 0xffff0000) == 0x34140000)
+		return;	/* everything ok, just return */
+
+	/* Check if delay branch uses "nop" */
+	if (opcode == INSN_NOP)
+		return;
+
+	/* Check if delay branch uses "copy %rX,%r20" */
+	if ((opcode & 0xffe0ffff) == 0x08000254) {
+		source_reg = (opcode >> 16) & 31;
+		regs->gr[source_reg] = regs->gr[20];
+		return;
+	}
+
+	pr_warn("syscall restart: %s (pid %d): unexpected opcode 0x%08x\n",
+		current->comm, task_pid_nr(current), opcode);
+}
+
 static inline void
 syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
 {
@@ -464,10 +513,7 @@ syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
 		}
 		/* fallthrough */
 	case -ERESTARTNOINTR:
-		/* A syscall is just a branch, so all
-		 * we have to do is fiddle the return pointer.
-		 */
-		regs->gr[31] -= 8; /* delayed branching */
+		check_syscallno_in_delay_branch(regs);
 		break;
 	}
 }
@@ -516,15 +562,9 @@ insert_restart_trampoline(struct pt_regs *regs)
 	}
 	case -ERESTARTNOHAND:
 	case -ERESTARTSYS:
-	case -ERESTARTNOINTR: {
-		/* Hooray for delayed branching.  We don't
-		 * have to restore %r20 (the system call
-		 * number) because it gets loaded in the delay
-		 * slot of the branch external instruction.
-		 */
-		regs->gr[31] -= 8;
+	case -ERESTARTNOINTR:
+		check_syscallno_in_delay_branch(regs);
 		return;
-	}
 	default:
 		break;
 	}
-- 
2.7.1

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  [PATCH 3.12 140/142] module: wrapper for symbol name. Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:10 +0100
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  [PATCH 3.12 106/142] iio: lpc32xx_adc: fix warnings caused by enabling unprepared clock Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:20 +0100
  [PATCH 3.12 138/142] intel_scu_ipcutil: underflow in scu_reg_access() Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:20 +0100
  [PATCH 3.12 125/142] Input: elantech - add Fujitsu Lifebook U745 to force crc_enabled Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:20 +0100
  [PATCH 3.12 135/142] radix-tree: fix race in gang lookup Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:20 +0100
  [PATCH 3.12 129/142] mm/memory_hotplug.c: check for missing sections in test_pages_in_a_zone() Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:20 +0100
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  [PATCH 3.12 120/142] ARM: 8519/1: ICST: try other dividends than 1 Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:20 +0100
  [PATCH 3.12 132/142] dma-debug: switch check from _text to _stext Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:20 +0100
  [PATCH 3.12 128/142] iommu/vt-d: Fix 64-bit accesses to 32-bit DMAR_GSTS_REG Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:20 +0100
  [PATCH 3.12 134/142] memcg: only free spare array when readers are done Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:20 +0100
  [PATCH 3.12 119/142] ARM: 8471/1: need to save/restore arm register(r11) when it is corrupted Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:20 +0100
  [PATCH 3.12 105/142] iio:ad7793: Fix ad7785 product ID Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:20 +0100
  [PATCH 3.12 131/142] m32r: fix m32104ut_defconfig build fail Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:20 +0100
  [PATCH 3.12 136/142] radix-tree: fix oops after radix_tree_iter_retry Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:20 +0100
  [PATCH 3.12 117/142] udf: Check output buffer length when converting name to CS0 Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:30 +0100
  [PATCH 3.12 116/142] udf: Prevent buffer overrun with multi-byte characters Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:30 +0100
  [PATCH 3.12 121/142] ARM: 8517/1: ICST: avoid arithmetic overflow in icst_hz() Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:30 +0100
  [PATCH 3.12 124/142] mm: fix mlock accouting Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:30 +0100
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  [PATCH 3.12 114/142] nfs: Fix race in __update_open_stateid() Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:30 +0100
  [PATCH 3.12 112/142] cifs_dbg() outputs an uninitialized buffer in cifs_readdir() Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:30 +0100
  [PATCH 3.12 109/142] iio: fix some warning messages Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:30 +0100
  [PATCH 3.12 102/142] scsi_dh_rdac: always retry MODE SELECT on command lock violation Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:30 +0100
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  [PATCH 3.12 099/142] iscsi-target: Fix potential dead-lock during node acl delete Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:30 +0100
  [PATCH 3.12 101/142] drivers/scsi/sg.c: mark VMA as VM_IO to prevent migration Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:30 +0100
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  [PATCH 3.12 115/142] udf: limit the maximum number of indirect extents in a row Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:30 +0100
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  [PATCH 3.12 091/142] tools lib traceevent: Fix output of %llu for 64 bit values read on 32 bit machines Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:40 +0100
  [PATCH 3.12 087/142] Btrfs: fix hang on extent buffer lock caused by the inode_paths ioctl Jiri Slaby <jslaby@suse.cz> - 2016-02-24 11:40 +0100
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  [PATCH 3.12 028/142] ALSA: usb-audio: Fix TEAC UD-501/UD-503/NT-503 usb delay Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:20 +0100
  [PATCH 3.12 026/142] media: vb2 dma-contig: Fully cache synchronise buffers in prepare and finish Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:20 +0100
  [PATCH 3.12 021/142] fix calculation of meta_bg descriptor backups Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:20 +0100
  [PATCH 3.12 007/142] kernel/signal.c: unexport sigsuspend() Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:20 +0100
  [PATCH 3.12 035/142] ALSA: pcm: Fix potential deadlock in OSS emulation Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:20 +0100
  [PATCH 3.12 034/142] ALSA: rawmidi: Fix race at copying & updating the position Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:20 +0100
  [PATCH 3.12 037/142] ALSA: seq: Fix yet another races among ALSA timer accesses Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:20 +0100
  [PATCH 3.12 023/142] parisc: Fix syscall restarts Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:20 +0100
  [PATCH 3.12 027/142] fix sysvfs symlinks Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:20 +0100
  [PATCH 3.12 020/142] jbd2: Fix unreclaimed pages after truncate in data=journal mode Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:20 +0100
  [PATCH 3.12 009/142] ocfs2/dlm: clear refmap bit of recovery lock while doing local recovery cleanup Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:20 +0100
  [PATCH 3.12 006/142] fat: fix fake_offset handling on error path Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:20 +0100
  [PATCH 3.12 033/142] ALSA: rawmidi: Remove kernel WARNING for NULL user-space buffer check Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:20 +0100
  [PATCH 3.12 036/142] ASoC: dpcm: fix the BE state on hw_free Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:20 +0100
  [PATCH 3.12 017/142] vTPM: fix memory allocation flag for rtce buffer at kernel boot Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:30 +0100
  [PATCH 3.12 014/142] spi: fix parent-device reference leak Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:30 +0100
  [PATCH 3.12 011/142] Revert "dm mpath: fix stalls when handling invalid ioctls" Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:30 +0100
  [PATCH 3.12 018/142] mtd: mtdpart: fix add_mtd_partitions error path Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:30 +0100
  [PATCH 3.12 016/142] wlcore/wl12xx: spi: fix NULL pointer dereference (Oops) Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:30 +0100
  [PATCH 3.12 012/142] spi: atmel: Fix DMA-setup for transfers with more than 8 bits per word Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:30 +0100
  [PATCH 3.12 013/142] spi: ti-qspi: Fix data corruption seen on r/w stress test Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:30 +0100
  [PATCH 3.12 008/142] ocfs2/dlm: ignore cleaning the migration mle that is inuse Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:30 +0100
  [PATCH 3.12 015/142] wlcore/wl12xx: spi: fix oops on firmware load Jiri Slaby <jslaby@suse.cz> - 2016-02-24 12:30 +0100

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