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coredump masking: reimplementation of dumpable using two flags

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This patch changes mm_struct.dumpable to a pair of bit flags.

set_dumpable() converts three-value dumpable to two flags and stores it into
lower two bits of mm_struct.flags instead of mm_struct.dumpable.
get_dumpable() behaves in the opposite way.

[[email protected]: export set_dumpable]
Signed-off-by: Hidehiro Kawai <[email protected]>
Cc: Alan Cox <[email protected]>
Cc: David Howells <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Nick Piggin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kawai, Hidehiro 2007-07-19 01:48:27 -07:00 • committed by Linus Torvalds
commit 6c5d523826
8 changed files with 82 additions and 25 deletions
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4
include/asm-ia64/processor.h
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@ -295,9 +295,9 @@ struct thread_struct {
regs->ar_bspstore = current->thread.rbs_bot; \
regs->ar_fpsr = FPSR_DEFAULT; \
regs->loadrs = 0; \
regs->r8 = current->mm->dumpable; /* set "don't zap registers" flag */ \
regs->r8 = get_dumpable(current->mm); /* set "don't zap registers" flag */ \
regs->r12 = new_sp - 16; /* allocate 16 byte scratch area */ \
if (unlikely(!current->mm->dumpable)) { \
if (unlikely(!get_dumpable(current->mm))) { \
/* \
* Zap scratch regs to avoid leaking bits between processes with different \
* uid/privileges. \