diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/exec.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/fs/exec.c b/fs/exec.c index e95aeeddd25..95aae3f9c03 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -2111,6 +2111,7 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs) int retval = 0; int flag = 0; int ispipe; + bool need_nonrelative = false; static atomic_t core_dump_count = ATOMIC_INIT(0); struct coredump_params cprm = { .signr = signr, @@ -2136,14 +2137,16 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs) if (!cred) goto fail; /* - * We cannot trust fsuid as being the "true" uid of the - * process nor do we know its entire history. We only know it - * was tainted so we dump it as root in mode 2. + * We cannot trust fsuid as being the "true" uid of the process + * nor do we know its entire history. We only know it was tainted + * 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) { /* Setuid core dump mode */ flag = O_EXCL; /* Stop rewrite attacks */ cred->fsuid = GLOBAL_ROOT_UID; /* Dump root private */ + need_nonrelative = true; } retval = coredump_wait(exit_code, &core_state); @@ -2223,6 +2226,14 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs) if (cprm.limit < binfmt->min_coredump) goto fail_unlock; + if (need_nonrelative && cn.corename[0] != '/') { + printk(KERN_WARNING "Pid %d(%s) can only dump core "\ + "to fully qualified path!\n", + task_tgid_vnr(current), current->comm); + printk(KERN_WARNING "Skipping core dump\n"); + goto fail_unlock; + } + cprm.file = filp_open(cn.corename, O_CREAT | 2 | O_NOFOLLOW | O_LARGEFILE | flag, 0600); |