kernel_samsung_sm7125

jenna

History

Bjorn Helgaas 80851ef2a5 [PATCH] /dev/mem: validate mmap requests Add a hook so architectures can validate /dev/mem mmap requests. This is analogous to validation we already perform in the read/write paths. The identity mapping scheme used on ia64 requires that each 16MB or 64MB granule be accessed with exactly one attribute (write-back or uncacheable). This avoids "attribute aliasing", which can cause a machine check. Sample problem scenario: - Machine supports VGA, so it has uncacheable (UC) MMIO at 640K-768K - efi_memmap_init() discards any write-back (WB) memory in the first granule - Application (e.g., "hwinfo") mmaps /dev/mem, offset 0 - hwinfo receives UC mapping (the default, since memmap says "no WB here") - Machine check abort (on chipsets that don't support UC access to WB memory, e.g., sx1000) In the scenario above, the only choices are - Use WB for hwinfo mmap. Can't do this because it causes attribute aliasing with the UC mapping for the VGA MMIO space. - Use UC for hwinfo mmap. Can't do this because the chipset may not support UC for that region. - Disallow the hwinfo mmap with -EINVAL. That's what this patch does. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: Hugh Dickins <hugh@veritas.com> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		19 years ago
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configs	[IA64-SGI] change default_sn2 to NR_CPUS==1024	19 years ago
dig	…
hp	…
ia32	[PATCH] use ptrace_get_task_struct in various places	19 years ago
kernel	[PATCH] /dev/mem: validate mmap requests	19 years ago
lib	…
mm	…
oprofile	[PATCH] remove gcc-2 checks	19 years ago
pci	[IA64] incorrect return from ia64_pci_legacy_write()	19 years ago
scripts	…
sn	[PATCH] driver kill hotplug word from sn and others fix	19 years ago
Kconfig	…
Kconfig.debug	…
Makefile	[PATCH] remove gcc-2 checks	19 years ago
defconfig	…
install.sh	…
module.lds	…