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Subject[PATCH RFC v2 1/4] exec: add a flag indicating if an exec file is a suid/sgid
Date
We create an additional flag in the struct linux_bprm to indicate a
suid/sgid binary. We will use this information in a later commit to
set the task_struct flags accordingly.

Signed-off-by: Wander Lairson Costa <wander@redhat.com>
---
fs/exec.c | 2 ++
include/linux/binfmts.h | 6 +++++-
2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/exec.c b/fs/exec.c
index 537d92c41105..ec07b36fdbb4 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1619,11 +1619,13 @@ static void bprm_fill_uid(struct linux_binprm *bprm, struct file *file)
if (mode & S_ISUID) {
bprm->per_clear |= PER_CLEAR_ON_SETID;
bprm->cred->euid = uid;
+ bprm->suid_bin = 1;
}

if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
bprm->per_clear |= PER_CLEAR_ON_SETID;
bprm->cred->egid = gid;
+ bprm->suid_bin = 1;
}
}

diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
index 049cf9421d83..c4b41b9711d2 100644
--- a/include/linux/binfmts.h
+++ b/include/linux/binfmts.h
@@ -41,7 +41,11 @@ struct linux_binprm {
* Set when errors can no longer be returned to the
* original userspace.
*/
- point_of_no_return:1;
+ point_of_no_return:1,
+ /*
+ * Is this a suid/sgid binary?
+ */
+ suid_bin:1;
#ifdef __alpha__
unsigned int taso:1;
#endif
--
2.27.0
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