diff options
| author | Marcel Holtmann <marcel@holtmann.org> | 2007-10-07 00:03:26 +0200 |
|---|---|---|
| committer | Adrian Bunk <bunk@kernel.org> | 2007-10-07 00:03:26 +0200 |
| commit | 9236d592ceee5d4033cd90d2f7d02440aea9b778 (patch) | |
| tree | 02e13a3de5a201115f1d37ca0a25165341253099 | |
| parent | de9e88d512afbad9f7a5d73b28dbcc332894b81a (diff) | |
Reset current->pdeath_signal on SUID binary execution (CVE-2007-3848)
This fixes a vulnerability in the "parent process death signal"
implementation discoverd by Wojciech Purczynski of COSEINC PTE Ltd.
and iSEC Security Research.
http://marc.info/?l=bugtraq&m=118711306802632&w=2
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
| -rw-r--r-- | fs/exec.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/exec.c b/fs/exec.c index 0b515ac53134..91a36b27ec91 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -891,9 +891,12 @@ int flush_old_exec(struct linux_binprm * bprm) */ current->mm->task_size = TASK_SIZE; - if (bprm->e_uid != current->euid || bprm->e_gid != current->egid || - file_permission(bprm->file, MAY_READ) || - (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP)) { + if (bprm->e_uid != current->euid || bprm->e_gid != current->egid) { + suid_keys(current); + current->mm->dumpable = suid_dumpable; + current->pdeath_signal = 0; + } else if (file_permission(bprm->file, MAY_READ) || + (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP)) { suid_keys(current); current->mm->dumpable = suid_dumpable; } @@ -991,8 +994,10 @@ void compute_creds(struct linux_binprm *bprm) { int unsafe; - if (bprm->e_uid != current->uid) + if (bprm->e_uid != current->uid) { suid_keys(current); + current->pdeath_signal = 0; + } exec_keys(current); task_lock(current); |