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    • Lennert Buytenhek's avatar
      [ARM] 5340/1: fix stack placement after noexecstack changes · 794baba6
      Lennert Buytenhek authored
      Commit 8ec53663
       ("[ARM] Improve
      non-executable support") added support for detecting non-executable
      stack binaries.  One of the things it does is to make READ_IMPLIES_EXEC
      be set in ->personality if we are running on a CPU that doesn't support
      the XN ("Execute Never") page table bit or if we are running a binary
      that needs an executable stack.
      This exposed a latent bug in ARM's asm/processor.h due to which we'll
      end up placing the stack at a very low address, where it will bump into
      the heap on any application that uses significant amount of stack or
      heap or both, causing many interesting crashes.
      Fix this by testing the ADDR_LIMIT_32BIT bit in ->personality instead
      of testing for equality against PER_LINUX_32BIT.
      Reviewed-by: default avatarNicolas Pitre <nico@marvell.com>
      Signed-off-by: default avatarLennert Buytenhek <buytenh@marvell.com>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>