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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2015-02-23 14:46:25 +0100 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2015-03-02 17:22:25 +0100 |
| commit | ef79705676b3fa19a243312f5ee36851306ee7d0 (patch) | |
| tree | 038b2a1db0f188383009520456bef0a7a3313cde /man7/feature_test_macros.7 | |
| parent | fe11933096ca8bca699e161b7d986c41414c00ec (diff) | |
| download | man-pages-ef79705676b3fa19a243312f5ee36851306ee7d0.tar.gz | |
feature_test_macros.7: srcfix
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man7/feature_test_macros.7')
| -rw-r--r-- | man7/feature_test_macros.7 | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/man7/feature_test_macros.7 b/man7/feature_test_macros.7 index eb9bb26c50..6cb73e9b92 100644 --- a/man7/feature_test_macros.7 +++ b/man7/feature_test_macros.7 @@ -479,6 +479,18 @@ With .B _FORTIFY_SOURCE set to 2 some more checking is added, but some conforming programs might fail. +.\" For example, given the following code +.\" int d; +.\" char buf[1000], buf[1000]; +.\" strcpy(fmt, "Hello world\n%n"); +.\" snprintf(buf, sizeof(buf), fmt, &d); +.\" +.\" Compiling with "gcc -D_FORTIFY_SOURCE=2 -O1" and then running will +.\" cause the following diagnostic at runtime at the snprintf() call +.\" +.\" *** %n in writable segment detected *** +.\" Aborted (core dumped) +.\" Some of the checks can be performed at compile time, and result in compiler warnings; other checks take place at run time, |