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| author | Volker Weißmann <volker.weissmann@gmx.de> | 2023-10-03 19:18:44 +0200 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-10-04 08:07:43 -0300 |
| commit | 7bb8045ec0595a031e68383849c3fbd9af134312 (patch) | |
| tree | af7b46bcd825f046599063cdc17aa9d6f0e2b1ba /sysdeps | |
| parent | 751850cf5a87e463f0f8b508672594e54853495c (diff) | |
| download | glibc-7bb8045ec0595a031e68383849c3fbd9af134312.zip glibc-7bb8045ec0595a031e68383849c3fbd9af134312.tar.gz glibc-7bb8045ec0595a031e68383849c3fbd9af134312.tar.bz2 | |
Fix FORTIFY_SOURCE false positive
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>
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/unix/sysv/linux/readonly-area.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/readonly-area.c b/sysdeps/unix/sysv/linux/readonly-area.c index edc6887..ba32372 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; } |