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| author | Bernd Schmidt <bernds_cb1@t-online.de> | 2008-04-23 23:06:15 +0400 |
|---|---|---|
| committer | Bryan Wu <cooloney@kernel.org> | 2008-04-23 23:06:15 +0400 |
| commit | d5adb029efad3c51db376d620319abe65d1efc21 (patch) | |
| tree | 660caff4c28e904f00a040c0ed4a17d5010c6f20 /arch/blackfin/kernel/process.c | |
| parent | 1ebc723cf04b55e7aeeec2e758293575d29a9c2b (diff) | |
| download | linux-d5adb029efad3c51db376d620319abe65d1efc21.tar.xz | |
[Blackfin] arch: This allows XIP to work with FD-PIC.
Previously, init failed to do anything meaningful;
it turns out that the reason is that FD-PIC has a readonly data
section which can be located in the XIP filesystem, and various address checks
in the kernel reject such addresses for syscall arguments. Hence, init's
execve ("/bin/sh", ...)
failed with error code EFAULT.
There's room for improvement here: in case people want to have filesystems
on flash rather than in main memory, _access_ok should be modified to
allow this.
This bug fix is also dedicated to Michael Hennerich.
Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to 'arch/blackfin/kernel/process.c')
| -rw-r--r-- | arch/blackfin/kernel/process.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c index fb94cbeafad6..be9fdd00d7cb 100644 --- a/arch/blackfin/kernel/process.c +++ b/arch/blackfin/kernel/process.c @@ -324,6 +324,12 @@ int _access_ok(unsigned long addr, unsigned long size) return 1; if (addr >= memory_mtd_end && (addr + size) <= physical_mem_end) return 1; + +#ifdef CONFIG_ROMFS_MTD_FS + /* For XIP, allow user space to use pointers within the ROMFS. */ + if (addr >= memory_mtd_start && (addr + size) <= memory_mtd_end) + return 1; +#endif #else if (addr >= memory_start && (addr + size) <= physical_mem_end) return 1; |