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| author | Eugene Syromyatnikov <evgsyr@gmail.com> | 2016-12-12 06:54:41 +0300 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-12-12 07:13:56 +0100 |
| commit | c49be32cd925a7b2b8b31a875ce96fb9c7025e12 (patch) | |
| tree | e791247a5ac6d0e139afa45ae41d479a54f07e73 | |
| parent | 86c91a79a5a05a050ee489d70d708b0b50cd3cb4 (diff) | |
| download | man-pages-c49be32cd925a7b2b8b31a875ce96fb9c7025e12.tar.gz | |
prctl.2: Note the output buffer size for PR_GET_TID_ADDRESS operation on x32/n32
Add note regarding the size of the output user space buffer
for PR_GET_TID_ADDRESS operation on x32/n32.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man2/prctl.2 | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/man2/prctl.2 b/man2/prctl.2 index 44ec6573c5..19b9789f84 100644 --- a/man2/prctl.2 +++ b/man2/prctl.2 @@ -988,7 +988,10 @@ flag, in the location pointed to by .IR "(int\ **)\ arg2" . This feature is available only if the kernel is built with the .BR CONFIG_CHECKPOINT_RESTORE -option enabled. +option enabled. Note that since the prctl() syscall does not have compat +implementation for AMD64 x32 and MIPS n32 ABIs, and the kernel writes out +pointer of kernel's pointer size, this operation expects a user space buffer +of 8 (not 4) bytes on these ABIs. .TP .BR PR_SET_TIMERSLACK " (since Linux 2.6.28)" .\" See https://lwn.net/Articles/369549/ |