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authorRam Pai <linuxram@us.ibm.com>2018-12-20 12:03:30 -0800
committerMichael Ellerman <mpe@ellerman.id.au>2018-12-21 14:46:50 +1100
commit2cd4bd192ee94848695c1c052d87913260e10f36 (patch)
tree196e1d7a1fb878dae550092bc739c5ac5e4318db /drivers/mcb
parent2f07229f02d4c55affccd11a61af4fd4b94dc436 (diff)
downloadlinux-2cd4bd192ee94848695c1c052d87913260e10f36.tar.bz2
powerpc/pkeys: Fix handling of pkey state across fork()
Protection key tracking information is not copied over to the mm_struct of the child during fork(). This can cause the child to erroneously allocate keys that were already allocated. Any allocated execute-only key is lost aswell. Add code; called by dup_mmap(), to copy the pkey state from parent to child explicitly. This problem was originally found by Dave Hansen on x86, which turns out to be a problem on powerpc aswell. Fixes: cf43d3b26452 ("powerpc: Enable pkey subsystem") Cc: stable@vger.kernel.org # v4.16+ Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/mcb')
0 files changed, 0 insertions, 0 deletions