uprobes: Teach copy_insn() to support tmpfs

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tmpfs is widely used but as Denys reports shmem_aops doesn't have
->readpage() and thus you can't probe a binary on this filesystem.

As Hugh suggested we can use shmem_read_mapping_page() in this case,
just we need to check shmem_mapping() if ->readpage == NULL.

Reported-by: Denys Vlasenko <dvlasenk@redhat.com>
Suggested-by: Hugh Dickins <hughd@google.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>

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Oleg Nesterov 2014-05-19 16:13:34 +02:00

parent 7fa3134817

commit 45e0a79a82

1 changed files with 10 additions and 5 deletions

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kernel/events/uprobes.c

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