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authorHelge Deller <deller@gmx.de>2015-02-03 21:52:47 +0100
committerHelge Deller <deller@gmx.de>2015-02-16 22:31:21 +0100
commit0bd1e94bf3da386510186cb2acd3e91f0ea59bc6 (patch)
tree7245097bc5cbe6f211db48ec230a3712b33201ca /arch/parisc
parentfb96a796f2b42eb20cfad80c5e7e2702948a0794 (diff)
downloadlinux-0bd1e94bf3da386510186cb2acd3e91f0ea59bc6.tar.bz2
parisc: Add error checks when building up signal trampoline handler
Add checks if the userspace trampoline code was correctly generated by the signal trampoline generation code. In addition only flush caches as needed and fix the old flushing code which didn't flushed all generated instructions. Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc')
-rw-r--r--arch/parisc/kernel/signal.c29
1 files changed, 15 insertions, 14 deletions
diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c
index 9b910a0251b8..1fd300c00a80 100644
--- a/arch/parisc/kernel/signal.c
+++ b/arch/parisc/kernel/signal.c
@@ -476,6 +476,9 @@ insert_restart_trampoline(struct pt_regs *regs)
case -ERESTART_RESTARTBLOCK: {
/* Restart the system call - no handlers present */
unsigned int *usp = (unsigned int *)regs->gr[30];
+ unsigned long start = (unsigned long) &usp[2];
+ unsigned long end = (unsigned long) &usp[5];
+ long err = 0;
/* Setup a trampoline to restart the syscall
* with __NR_restart_syscall
@@ -487,23 +490,21 @@ insert_restart_trampoline(struct pt_regs *regs)
* 16: ldi __NR_restart_syscall, %r20
*/
#ifdef CONFIG_64BIT
- put_user(regs->gr[31] >> 32, &usp[0]);
- put_user(regs->gr[31] & 0xffffffff, &usp[1]);
- put_user(0x0fc010df, &usp[2]);
+ err |= put_user(regs->gr[31] >> 32, &usp[0]);
+ err |= put_user(regs->gr[31] & 0xffffffff, &usp[1]);
+ err |= put_user(0x0fc010df, &usp[2]);
#else
- put_user(regs->gr[31], &usp[0]);
- put_user(0x0fc0109f, &usp[2]);
+ err |= put_user(regs->gr[31], &usp[0]);
+ err |= put_user(0x0fc0109f, &usp[2]);
#endif
- put_user(0xe0008200, &usp[3]);
- put_user(0x34140000, &usp[4]);
+ err |= put_user(0xe0008200, &usp[3]);
+ err |= put_user(0x34140000, &usp[4]);
- /* Stack is 64-byte aligned, and we only need
- * to flush 1 cache line.
- * Flushing one cacheline is cheap.
- * "sync" on bigger (> 4 way) boxes is not.
- */
- flush_user_dcache_range(regs->gr[30], regs->gr[30] + 4);
- flush_user_icache_range(regs->gr[30], regs->gr[30] + 4);
+ WARN_ON(err);
+
+ /* flush data/instruction cache for new insns */
+ flush_user_dcache_range(start, end);
+ flush_user_icache_range(start, end);
regs->gr[31] = regs->gr[30] + 8;
return;