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 <[EMAIL PROTECTED]> Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]> Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]> Signed-off-by: Willy Tarreau <[EMAIL PROTECTED]> --- fs/exec.c | 13 +++++++++---- 1 files changed, 9 insertions(+), 4 deletions(-) diff --git a/fs/exec.c b/fs/exec.c index 0f8573a..bd1ab3f 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -881,9 +881,12 @@ 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; } @@ -974,8 +977,10 @@ 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); -- 1.5.2.5 -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
