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libcamera: shared_mem_object: Prevent memfd from shrinking or growing

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The memfd underlying the SharedMem object must not shrink, or memory
corruption will happen. Prevent this by setting the shrink seal on the
file. As there's no valid use case for growing the memory either, set
the grow seal as well.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Tested-by: Milan Zamazal <mzamazal@redhat.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Laurent Pinchart 2024-07-31 02:09:44 +03:00
parent 93d9751945
commit efc7a85bc0
1 changed files with 2 additions and 1 deletions
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3
src/libcamera/shared_mem_object.cpp
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@ -58,7 +58,8 @@ SharedMem::SharedMem() = default;
*/
SharedMem::SharedMem(const std::string &name, std::size_t size)
{
UniqueFD memfd = MemFd::create(name.c_str(), size);
UniqueFD memfd = MemFd::create(name.c_str(), size, MemFd::Seal::Shrink |
MemFd::Seal::Grow);
if (!memfd.isValid())
return;