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exec: clarify reasoning for euid/egid reset

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This section of code initially looks redundant, but is required. This
improves the comment to explain more clearly why the reset is needed.

Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kees Cook 2016-05-17 12:14:39 -07:00 committed by Linus Torvalds
parent 7f427d3a60
commit cb6fd68fdd
1 changed files with 6 additions and 1 deletions
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7
fs/exec.c
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@ -1387,7 +1387,12 @@ static void bprm_fill_uid(struct linux_binprm *bprm)
kuid_t uid;
kgid_t gid;
/* clear any previous set[ug]id data from a previous binary */
/*
* Since this can be called multiple times (via prepare_binprm),
* we must clear any previous work done when setting set[ug]id
* bits from any earlier bprm->file uses (for example when run
* first for a setuid script then again for its interpreter).
*/
bprm->cred->euid = current_euid();
bprm->cred->egid = current_egid();