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| author | Oleg Nesterov <oleg@redhat.com> | 2012-10-04 17:15:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-06 03:05:15 +0900 |
| commit | 12a2b4b2241e318b4f6df31228e4272d2c2968a1 (patch) | |
| tree | 569ce8d4d64fa163a997d98fb9dd20d275c72068 /fs/coredump.c | |
| parent | 179899fd5dc780fe3bcd44d0eb7823e3d855c855 (diff) | |
| download | lwn-12a2b4b2241e318b4f6df31228e4272d2c2968a1.tar.gz lwn-12a2b4b2241e318b4f6df31228e4272d2c2968a1.zip | |
coredump: add support for %d=__get_dumpable() in core name
Some coredump handlers want to create a core file in a way compatible with
standard behavior. Standard behavior with fs.suid_dumpable = 2 is to
create core file with uid=gid=0. However, there was no way for coredump
handler to know that the process being dumped was suid'ed.
This patch adds the new %d specifier for format_corename() which simply
reports __get_dumpable(mm->flags), this is compatible with
/proc/sys/fs/suid_dumpable we already have.
Addresses https://bugzilla.redhat.com/show_bug.cgi?id=787135
Developed during a discussion with Denys Vlasenko.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Alex Kelly <alex.page.kelly@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Cong Wang <amwang@redhat.com>
Cc: Jiri Moskovcak <jmoskovc@redhat.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/coredump.c')
| -rw-r--r-- | fs/coredump.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/coredump.c b/fs/coredump.c index c01aa7b9ab5d..4fce06fc3b56 100644 --- a/fs/coredump.c +++ b/fs/coredump.c @@ -149,7 +149,7 @@ put_exe_file: * name into corename, which must have space for at least * CORENAME_MAX_SIZE bytes plus one byte for the zero terminator. */ -static int format_corename(struct core_name *cn, long signr) +static int format_corename(struct core_name *cn, struct coredump_params *cprm) { const struct cred *cred = current_cred(); const char *pat_ptr = core_pattern; @@ -194,9 +194,13 @@ static int format_corename(struct core_name *cn, long signr) case 'g': err = cn_printf(cn, "%d", cred->gid); break; + case 'd': + err = cn_printf(cn, "%d", + __get_dumpable(cprm->mm_flags)); + break; /* signal that caused the coredump */ case 's': - err = cn_printf(cn, "%ld", signr); + err = cn_printf(cn, "%ld", cprm->signr); break; /* UNIX time of coredump */ case 't': { @@ -515,7 +519,7 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs) */ clear_thread_flag(TIF_SIGPENDING); - ispipe = format_corename(&cn, signr); + ispipe = format_corename(&cn, &cprm); if (ispipe) { int dump_count; |