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authorPaul Mackerras <paulus@samba.org>2007-06-26 14:49:11 +1000
committerPaul Mackerras <paulus@samba.org>2007-06-26 14:49:11 +1000
commitae62fbb5f1f796d87cbdbe6701e13f2b52d5c0a7 (patch)
tree42c190d210c90876dbc799fd58896fbdce9164ce /crypto/ecb.c
parent74609f4536f2b8fd6a48381bbbe3cd37da20a527 (diff)
[POWERPC] Fix subtle FP state corruption bug in signal return on SMP
This fixes a bug which can cause corruption of the floating-point state on return from a signal handler. If we have a signal handler that has used the floating-point registers, and it happens to context-switch to another task while copying the interrupted floating-point state from the user stack into the thread struct (e.g. because of a page fault, or because it gets preempted), the context switch code will think that the FP registers contain valid FP state that needs to be copied into the thread_struct, and will thus overwrite the values that the signal return code has put into the thread_struct. This can occur because we clear the MSR bits that indicate the presence of valid FP state after copying the state into the thread_struct. To fix this we just move the clearing of the MSR bits to before the copy. A similar potential problem also occurs with the Altivec state, and this fixes that in the same way. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'crypto/ecb.c')
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