systemd/SOURCES/0077-process-util-don-t-use-overly-large-buffer-to-store-.patch
2021-09-10 05:03:39 +00:00

72 lines
2.1 KiB
Diff

From 9b9b6d8c7b10c069d36f85bd17f144011282cb58 Mon Sep 17 00:00:00 2001
From: Michal Sekletar <msekleta@redhat.com>
Date: Tue, 22 Jan 2019 14:29:50 +0100
Subject: [PATCH] process-util: don't use overly large buffer to store process
command line
Allocate new string as a return value and free our "scratch pad"
buffer that is potentially much larger than needed (up to
_SC_ARG_MAX).
Fixes #11502
(cherry-picked from commit eb1ec489eef8a32918bbfc56a268c9d10464584d)
Related: #1664976
---
src/basic/process-util.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/src/basic/process-util.c b/src/basic/process-util.c
index a20f1e3ccf..aa3eff779a 100644
--- a/src/basic/process-util.c
+++ b/src/basic/process-util.c
@@ -101,7 +101,8 @@ int get_process_comm(pid_t pid, char **ret) {
int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) {
_cleanup_fclose_ FILE *f = NULL;
bool space = false;
- char *k, *ans = NULL;
+ char *k;
+ _cleanup_free_ char *ans = NULL;
const char *p;
int c;
@@ -142,7 +143,7 @@ int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char *
if (!ans)
return -ENOMEM;
- *line = ans;
+ *line = TAKE_PTR(ans);
return 0;
} else {
@@ -207,7 +208,7 @@ int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char *
_cleanup_free_ char *t = NULL;
int h;
- free(ans);
+ ans = mfree(ans);
if (!comm_fallback)
return -ENOENT;
@@ -240,9 +241,18 @@ int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char *
if (!ans)
return -ENOMEM;
}
+
+ *line = TAKE_PTR(ans);
+ return 0;
}
- *line = ans;
+ k = realloc(ans, strlen(ans) + 1);
+ if (!k)
+ return -ENOMEM;
+
+ ans = NULL;
+ *line = k;
+
return 0;
}