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| author |   Finn Thain <fthain@telegraphics.com.au> | 2019-01-15 15:18:56 +1100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-22 10:21:45 +0100 |
| commit | 20e07af71f34d9d1f18aefde6ed234d775fa62bc (patch) | |
| tree | f720dd22d83d71db9fcbf36430461e497791501c /drivers/char/nvram.c | |
| parent | char/generic_nvram: Remove as unused (diff) | |
| download | linux-dev-20e07af71f34d9d1f18aefde6ed234d775fa62bc.tar.xz linux-dev-20e07af71f34d9d1f18aefde6ed234d775fa62bc.zip | |
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.c | 4 |
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 */ |