git: f6000e9dd934 - main - kern/kern_proc.c: do not throw out read data in get_ps_strings()

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=f6000e9dd934db9fefc31eaa07a7d8fa9277484e

commit f6000e9dd934db9fefc31eaa07a7d8fa9277484e
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2026-08-14 05:23:22 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-08-14 14:35:38 +0000

    kern/kern_proc.c: do not throw out read data in get_ps_strings()
    
    Since vmspace_iop()/proc_readmem() might return -1 on error from
    vmspace_rwmem(), account for this and stop reading but return already
    accumulated data if any, instead of returning an error.
    
    PR:     297512
    Reported and tested by: Stéphane D'Alu <sdalu@sdalu.com>
    Reviewed by:    markj
    Fixes:  e1b0d051bbf7 ("proc: Allow to make proc_rwmem() operate on a consistent address space")
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D58838
---
 sys/kern/kern_proc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/kern/kern_proc.c b/sys/kern/kern_proc.c
index 41e5b6594981..6489feca99fc 100644
--- a/sys/kern/kern_proc.c
+++ b/sys/kern/kern_proc.c
@@ -2064,8 +2064,11 @@ get_ps_strings(struct thread *td, struct proc *p, struct sbuf *sb,
 		for (sptr = proc_vector[i]; ; sptr += GET_PS_STRINGS_CHUNK_SZ) {
 			error = proc_read_string(td, vm, sptr, pss_string,
 			    sizeof(pss_string));
-			if (error != 0)
+			if (error != 0) {
+				if (done != 0)
+					error = 0;
 				goto done;
+			}
 			len = strnlen(pss_string, GET_PS_STRINGS_CHUNK_SZ);
 			if (done + len >= nchr)
 				len = nchr - done - 1;