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| author | Brooks Davis <brooks@FreeBSD.org> | 2018-07-13 11:32:27 +0000 |
|---|---|---|
| committer | Brooks Davis <brooks@FreeBSD.org> | 2018-07-13 11:32:27 +0000 |
| commit | d92da7594102739c7786552c53e07e4ce3367f39 (patch) | |
| tree | 46d89bb703a9d86da91a75ec823bbcc87fbac67c /sys/kern/kern_exec.c | |
| parent | 874774c5d486aefc80e345b1f12ec3c9f1628fd5 (diff) | |
| download | src-d92da7594102739c7786552c53e07e4ce3367f39.tar.gz src-d92da7594102739c7786552c53e07e4ce3367f39.zip | |
Round down the location of execpathp to slightly improve copyout speed.
In practice, this moves the padding from below the canary to above
execpathp has no impact on stack consumption.
Submitted by: Wuyang-Chung (via github pull request #159)
MFC after: 1 week
Notes
Notes:
svn path=/head/; revision=336238
Diffstat (limited to 'sys/kern/kern_exec.c')
| -rw-r--r-- | sys/kern/kern_exec.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c index e6b3782d93dd..99b5016a41d7 100644 --- a/sys/kern/kern_exec.c +++ b/sys/kern/kern_exec.c @@ -1512,6 +1512,7 @@ exec_copyout_strings(struct image_params *imgp) */ if (execpath_len != 0) { destp -= execpath_len; + destp = rounddown2(destp, sizeof(void *)); imgp->execpathp = destp; copyout(imgp->execpath, (void *)destp, execpath_len); } |