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From 5913893d6f3de65b16e1ad294b88893305efb20f Mon Sep 17 00:00:00 2001
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From: Ondrej Dubaj <odubaj@redhat.com>
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Date: Thu, 18 Feb 2021 09:59:31 +0100
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Subject: [PATCH] * lib/system.h (ERRNO_IS_EACCES): Remove. Not used anymore.
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(sys_reset_uid_gid): Re-initialize supplementary groups when switching
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privileges. Fix ordering of setgid and setuid calls.
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---
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lib/system.h | 32 +++++++++++++++++++++++++-------
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1 file changed, 25 insertions(+), 7 deletions(-)
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diff --git a/lib/system.h b/lib/system.h
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index 1c1a5d0..4fd3ce9 100644
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--- a/lib/system.h
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+++ b/lib/system.h
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@@ -470,19 +470,37 @@ char *getenv ();
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#if MSDOS
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# include <process.h>
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# define SET_BINARY_MODE(arc) setmode(arc, O_BINARY)
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-# define ERRNO_IS_EACCES errno == EACCES
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# define mkdir(file, mode) (mkdir) (file)
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# define TTY_NAME "con"
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# define sys_reset_uid_gid()
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#else
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# define SET_BINARY_MODE(arc)
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-# define ERRNO_IS_EACCES 0
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# define TTY_NAME "/dev/tty"
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-# define sys_reset_uid_gid() \
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- do { \
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- if (! (setuid (getuid ()) == 0 && setgid (getgid ()) == 0)) \
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- abort (); \
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- } while (0)
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+# include <paxlib.h>
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+static inline void
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+sys_reset_uid_gid (void)
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+{
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+ struct passwd *pw;
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+ uid_t uid = getuid ();
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+ gid_t gid = getgid ();
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+
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+ if ((pw = getpwuid (uid)) == NULL)
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+ {
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+ FATAL_ERROR ((0, errno, "%s(%lu)", "getpwuid", (unsigned long)uid));
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+ }
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+ if (initgroups (pw->pw_name, getgid ()))
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+ {
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+ FATAL_ERROR ((0, errno, "%s", "initgroups"));
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+ }
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+ if (gid != getegid () && setgid (gid) && errno != EPERM)
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+ {
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+ FATAL_ERROR ((0, errno, "%s", "setgid"));
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+ }
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+ if (uid != geteuid () && setuid (uid) && errno != EPERM)
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+ {
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+ FATAL_ERROR ((0, errno, "%s", "setuid"));
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+ }
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+}
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#endif
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#if XENIX
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--
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2.26.0
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