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Date: Fri, 09 Mar 2012 11:02:28 -0800 From: Greg KH <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: torvalds@...ux-foundation.org, akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk, Michael Cree <mcree@...on.net.nz>, Phil Carmody <ext-phil.2.carmody@...ia.com>, Richard Henderson <rth@...ddle.net>, Michel Lespinasse <walken@...gle.com>, Ivan Kokshaysky <ink@...assic.park.msu.ru>, Matt Turner <mattst88@...il.com> Subject: [ 26/95] alpha: fix 32/64-bit bug in futex support 3.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andrew Morton <akpm@...ux-foundation.org> commit 62aca403657fe30e5235c5331e9871e676d9ea0a upstream. Michael Cree said: : : I have noticed some user space problems (pulseaudio crashes in pthread : : code, glibc/nptl test suite failures, java compiler freezes on SMP alpha : : systems) that arise when using a 2.6.39 or later kernel on Alpha. : : Bisecting between 2.6.38 and 2.6.39 (using glibc/nptl test suite as : : criterion for good/bad kernel) eventually leads to: : : : : 8d7718aa082aaf30a0b4989e1f04858952f941bc is the first bad commit : : commit 8d7718aa082aaf30a0b4989e1f04858952f941bc : : Author: Michel Lespinasse <walken@...gle.com> : : Date: Thu Mar 10 18:50:58 2011 -0800 : : : : futex: Sanitize futex ops argument types : : : : Change futex_atomic_op_inuser and futex_atomic_cmpxchg_inatomic : : prototypes to use u32 types for the futex as this is the data type the : : futex core code uses all over the place. : : : : Looking at the commit I see there is a change of the uaddr argument in : : the Alpha architecture specific code for futexes from int to u32, but I : : don't see why this should cause a problem. Richard Henderson said: : futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, : u32 oldval, u32 newval) : ... : : "r"(uaddr), "r"((long)oldval), "r"(newval) : : : There is no 32-bit compare instruction. These are implemented by : consistently extending the values to a 64-bit type. Since the : load instruction sign-extends, we want to sign-extend the other : quantity as well (despite the fact it's logically unsigned). : : So: : : - : "r"(uaddr), "r"((long)oldval), "r"(newval) : + : "r"(uaddr), "r"((long)(int)oldval), "r"(newval) : : should do the trick. Michael said: : This fixes the glibc test suite failures and the pulseaudio related : crashes, but it does not fix the java compiiler lockups that I was (and : are still) observing. That is some other problem. Reported-by: Michael Cree <mcree@...on.net.nz> Tested-by: Michael Cree <mcree@...on.net.nz> Acked-by: Phil Carmody <ext-phil.2.carmody@...ia.com> Cc: Richard Henderson <rth@...ddle.net> Cc: Michel Lespinasse <walken@...gle.com> Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru> Reviewed-by: Matt Turner <mattst88@...il.com> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/alpha/include/asm/futex.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/alpha/include/asm/futex.h +++ b/arch/alpha/include/asm/futex.h @@ -108,7 +108,7 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, " lda $31,3b-2b(%0)\n" " .previous\n" : "+r"(ret), "=&r"(prev), "=&r"(cmp) - : "r"(uaddr), "r"((long)oldval), "r"(newval) + : "r"(uaddr), "r"((long)(int)oldval), "r"(newval) : "memory"); *uval = prev; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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