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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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2
security/commoncap.c
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@ -148,7 +148,7 @@ void cap_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
if (bprm->e_uid != current->uid || bprm->e_gid != current->gid ||
!cap_issubset (new_permitted, current->cap_permitted)) {
current->mm->dumpable = suid_dumpable;
set_dumpable(current->mm, suid_dumpable);
if (unsafe & ~LSM_UNSAFE_PTRACE_CAP) {
if (!capable(CAP_SETUID)) {