On Tue, Apr 12, 2011 at 05:42:24PM -0700, Michael Bohan wrote: > Hi, > > In arch/arm/kernel/traps.c:set_tls() and arch/arm/include/asm/tls.h, > some configurations allow for a assignment of address 0xffff0ff0. This > address falls within the MT_HIGH_VECTORS mapping setup in > devicemaps_init(). That mapping is explicitly made read-only. Thus, the > kernel takes a segfault when writing in set_tls(). > > It looks like this disparity may have been introduced in this commit: > > commit 36bb94ba36f332de767cfaa3af6a5136435a3a9c > Author: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx> > Date: Tue Nov 16 08:40:36 2010 +0000 > > ARM: pgtable: provide RDONLY page table bit rather than WRITE bit > > Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx> > > Is there a reason this mapping must be read-only? Perhaps we could apply > write access for these special cases only? Have you checked the behaviour immediately before this commit, and the behaviour with this commit applied? -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
