Commits on Jul 5, 2022

1. bcc/syms: Fix shared lib module offset <-> global addr conversion …

   `bcc` does various conversions of "global address" to "module offset" and
   vice versa. Previous work (iovisor#1670) modified the "global address" ->
   "module offset" calculation in `ProcSyms::Module::contains` to account
   for differences between the file offset a section is loading bytes from
   and the requested start address (relative to the base address of the
   `.so`). Unfortunately that change didn't also modify "module offset" ->
   "global address" calculations, such as the one in
   bcc_resolve_global_addr. Update that calculation to account for the
   same.
   
   This calculation discrepancy was most apparent for us in production when
   trying to attach USDTs to a shared lib with differing requested start
   address and file offset. This patch also adds a test w/ comments
   describing our specific situation and demonstrating how the patch fixes
   the issue.
   
   Signed-off-by: Dave Marchevsky <[email protected]>

   

   davemarchevsky committed Jul 5, 2022
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