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authorAlexey Kardashevskiy <aik@ozlabs.ru>2016-02-15 12:55:06 +1100
committerPaul Mackerras <paulus@samba.org>2016-02-16 13:44:26 +1100
commitf8626985c7c2485c423ce9f448028f81535b0ecc (patch)
treef6f7a2b997299bf4dcaa0571a754080795f77960 /fs/fhandle.c
parent366baf28ee3fc22dea504a0bddf8edd1e9bcee70 (diff)
KVM: PPC: Account TCE-containing pages in locked_vm
At the moment pages used for TCE tables (in addition to pages addressed by TCEs) are not counted in locked_vm counter so a malicious userspace tool can call ioctl(KVM_CREATE_SPAPR_TCE) as many times as RLIMIT_NOFILE and lock a lot of memory. This adds counting for pages used for TCE tables. This counts the number of pages required for a table plus pages for the kvmppc_spapr_tce_table struct (TCE table descriptor) itself. This changes release_spapr_tce_table() to store @npages on stack to avoid calling kvmppc_stt_npages() in the loop (tiny optimization, probably). This does not change the amount of used memory. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'fs/fhandle.c')
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