diff options
| author | Kees Cook <keescook@chromium.org> | 2012-07-30 14:39:18 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-30 17:25:11 -0700 |
| commit | 54b501992dd2a839e94e76aa392c392b55080ce8 (patch) | |
| tree | 6d174fb95516f01e385d31d5ef87a248d8740fd2 /fs/exec.c | |
| parent | 9520628e8ceb69fa9a4aee6b57f22675d9e1b709 (diff) | |
| download | lwn-54b501992dd2a839e94e76aa392c392b55080ce8.tar.gz lwn-54b501992dd2a839e94e76aa392c392b55080ce8.zip | |
coredump: warn about unsafe suid_dumpable / core_pattern combo
When suid_dumpable=2, detect unsafe core_pattern settings and warn when
they are seen.
Signed-off-by: Kees Cook <keescook@chromium.org>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Alan Cox <alan@linux.intel.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Cc: James Morris <james.l.morris@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/exec.c')
| -rw-r--r-- | fs/exec.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/exec.c b/fs/exec.c index 95aae3f9c036..5af8390e0fae 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -2002,17 +2002,17 @@ static void coredump_finish(struct mm_struct *mm) void set_dumpable(struct mm_struct *mm, int value) { switch (value) { - case 0: + case SUID_DUMPABLE_DISABLED: clear_bit(MMF_DUMPABLE, &mm->flags); smp_wmb(); clear_bit(MMF_DUMP_SECURELY, &mm->flags); break; - case 1: + case SUID_DUMPABLE_ENABLED: set_bit(MMF_DUMPABLE, &mm->flags); smp_wmb(); clear_bit(MMF_DUMP_SECURELY, &mm->flags); break; - case 2: + case SUID_DUMPABLE_SAFE: set_bit(MMF_DUMP_SECURELY, &mm->flags); smp_wmb(); set_bit(MMF_DUMPABLE, &mm->flags); @@ -2025,7 +2025,7 @@ static int __get_dumpable(unsigned long mm_flags) int ret; ret = mm_flags & MMF_DUMPABLE_MASK; - return (ret >= 2) ? 2 : ret; + return (ret > SUID_DUMPABLE_ENABLED) ? SUID_DUMPABLE_SAFE : ret; } int get_dumpable(struct mm_struct *mm) @@ -2142,7 +2142,7 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs) * so we dump it as root in mode 2, and only into a controlled * environment (pipe handler or fully qualified path). */ - if (__get_dumpable(cprm.mm_flags) == 2) { + if (__get_dumpable(cprm.mm_flags) == SUID_DUMPABLE_SAFE) { /* Setuid core dump mode */ flag = O_EXCL; /* Stop rewrite attacks */ cred->fsuid = GLOBAL_ROOT_UID; /* Dump root private */ |