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authorFinn Thain <fthain@telegraphics.com.au>2019-01-15 07:18:56 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-01-22 12:21:45 +0300
commit20e07af71f34d9d1f18aefde6ed234d775fa62bc (patch)
treef720dd22d83d71db9fcbf36430461e497791501c /drivers/char/nvram.c
parent537f3286ad8fdd96e56a027160867ef092651353 (diff)
downloadlinux-20e07af71f34d9d1f18aefde6ed234d775fa62bc.tar.xz
powerpc: Adopt nvram module for PPC64
Adopt nvram module to reduce code duplication. This means CONFIG_NVRAM becomes available to PPC64 builds. Previously it was only available to PPC32 builds because it depended on CONFIG_GENERIC_NVRAM. The IOC_NVRAM_GET_OFFSET ioctl as implemented on PPC64 validates the offset returned by pmac_get_partition(). Do the same in the nvram module. Note that the old PPC32 generic_nvram module lacked this test. So when CONFIG_PPC32 && CONFIG_PPC_PMAC, the IOC_NVRAM_GET_OFFSET ioctl would have returned 0 (always). But when CONFIG_PPC64 && CONFIG_PPC_PMAC, the IOC_NVRAM_GET_OFFSET ioctl would have returned -1 (which is -EPERM) when the requested partition was not found. With this patch, the result is now -EINVAL on both PPC32 and PPC64 when the requested PowerMac NVRAM partition is not found. This is a userspace- visible change, in the non-existent partition case, which would be in an error path for an IOC_NVRAM_GET_OFFSET ioctl syscall. Tested-by: Stan Johnson <userm57@yahoo.com> Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/char/nvram.c')
-rw-r--r--drivers/char/nvram.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/char/nvram.c b/drivers/char/nvram.c
index 944f05fddacd..eff1e3f1b3a2 100644
--- a/drivers/char/nvram.c
+++ b/drivers/char/nvram.c
@@ -302,6 +302,8 @@ static long nvram_misc_ioctl(struct file *file, unsigned int cmd,
if (part < pmac_nvram_OF || part > pmac_nvram_NR)
return -EINVAL;
offset = pmac_get_partition(part);
+ if (offset < 0)
+ return -EINVAL;
if (copy_to_user((void __user *)arg,
&offset, sizeof(offset)) != 0)
return -EFAULT;
@@ -309,6 +311,7 @@ static long nvram_misc_ioctl(struct file *file, unsigned int cmd,
}
#endif
break;
+#ifdef CONFIG_PPC32
case IOC_NVRAM_SYNC:
if (ppc_md.nvram_sync != NULL) {
mutex_lock(&nvram_mutex);
@@ -317,6 +320,7 @@ static long nvram_misc_ioctl(struct file *file, unsigned int cmd,
}
ret = 0;
break;
+#endif
#elif defined(CONFIG_X86) || defined(CONFIG_M68K)
case NVRAM_INIT:
/* initialize NVRAM contents and checksum */