From: "Volker Weißmann" <volker.weissmann@gmx.de>
To: libc-alpha@sourceware.org
Cc: "Volker Weißmann" <volker.weissmann@gmx.de>
Subject: [PATCH v3] Fix FORTIFY_SOURCE false positive
Date: Tue, 3 Oct 2023 19:18:44 +0200 [thread overview]
Message-ID: <20231003171844.9586-1-volker.weissmann@gmx.de> (raw)
When -D_FORTIFY_SOURCE=2 was given during compilation,
sprintf and similar functions will check if their
first argument is in read-only memory and exit with
*** %n in writable segment detected ***
otherwise. To check if the memory is read-only, glibc
reads frpm the file "/proc/self/maps". If opening this
file fails due to too many open files (EMFILE), glibc
will now ignore this error.
Fixes [BZ #30932]
Signed-off-by: Volker Weißmann <volker.weissmann@gmx.de>
---
sysdeps/unix/sysv/linux/readonly-area.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/sysdeps/unix/sysv/linux/readonly-area.c b/sysdeps/unix/sysv/linux/readonly-area.c
index edc68873f6..ba32372ebb 100644
--- a/sysdeps/unix/sysv/linux/readonly-area.c
+++ b/sysdeps/unix/sysv/linux/readonly-area.c
@@ -42,7 +42,9 @@ __readonly_area (const char *ptr, size_t size)
to the /proc filesystem if it is set[ug]id. There has
been no willingness to change this in the kernel so
far. */
- || errno == EACCES)
+ || errno == EACCES
+ /* Process has reached the maximum number of open files. */
+ || errno == EMFILE)
return 1;
return -1;
}
--
2.42.0
next reply other threads:[~2023-10-03 17:18 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-03 17:18 Volker Weißmann [this message]
2023-10-03 17:25 ` Siddhesh Poyarekar
2023-10-03 18:13 ` [PATCH] debug: Add regression tests for BZ 30932 Adhemerval Zanella
2023-10-03 18:48 ` Siddhesh Poyarekar
2023-10-04 14:43 ` [PATCH v3] Fix FORTIFY_SOURCE false positive Volker Weißmann
2023-10-04 16:57 ` Adhemerval Zanella Netto
2023-10-04 17:08 ` Siddhesh Poyarekar
2023-10-04 14:51 ` Andreas Schwab
2023-10-04 15:44 ` Volker Weißmann
2023-10-04 17:36 ` Florian Weimer
2023-10-04 17:45 ` Siddhesh Poyarekar
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