[LTP] [PATCH 0/4] syscalls/ipc: shmctl04: Fix /proc/sysvipc/shm parsing

[LTP] [PATCH 0/4] syscalls/ipc: shmctl04: Fix /proc/sysvipc/shm parsing

[Guixiong Wei via ltp]

Hi,

This series fixes shmctl04 parsing and reporting for /proc/sysvipc/shm.

On systems with large SHM segments, the "bytes" column in /proc/sysvipc/shm may
exceed int range, which can lead to truncation and incorrect accounting. The
series parses the size column as unsigned long, requires fscanf() to match all
expected fields to avoid using stale values on partial matches, fixes format
specifiers when reporting counters, and uses SAFE_FOPEN/SAFE_FCLOSE for /proc
reads.

Thanks.

Guixiong Wei (4):
  syscalls/ipc: shmctl04: Parse /proc/sysvipc/shm size as unsigned long
  syscalls/ipc: shmctl04: Require full fscanf match
  syscalls/ipc: shmctl04: Use SAFE_FOPEN for /proc parsing
  syscalls/ipc: shmctl04: Fix shm_info print formats

 .../kernel/syscalls/ipc/shmctl/shmctl04.c     | 24 ++++++++++---------
 1 file changed, 13 insertions(+), 11 deletions(-)

-- 
2.20.1

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[LTP] [PATCH 1/4] syscalls/ipc: shmctl04: Parse /proc/sysvipc/shm size as unsigned long

[Guixiong Wei via ltp]

The size column in /proc/sysvipc/shm may exceed int range on
some systems. Parse it as unsigned long.

Signed-off-by: Guixiong Wei <weiguixiong@bytedance.com>
---
 testcases/kernel/syscalls/ipc/shmctl/shmctl04.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c b/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c
index 3ba05f9b5..908cd2926 100644
--- a/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c
+++ b/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c
@@ -57,7 +57,8 @@ static void parse_proc_sysvipc(struct shm_info *info)
 			break;
 	}
 
-	int shmid, size, rss, swap;
+	int shmid, rss, swap;
+	unsigned long size;
 
 	/*
 	 * Sum rss, swap and size for all elements listed, which should equal
@@ -66,7 +67,7 @@ static void parse_proc_sysvipc(struct shm_info *info)
 	 * Note that the size has to be rounded up to nearest multiple of page
 	 * size.
 	 */
-	while (fscanf(f, "%*i %i %*i %i %*i %*i %*i %*i %*i %*i %*i %*i %*i %*i %i %i",
+	while (fscanf(f, "%*i %i %*i %lu %*i %*i %*i %*i %*i %*i %*i %*i %*i %*i %i %i",
 			&shmid, &size, &rss, &swap) > 0) {
 		used_ids++;
 		shm_rss += rss/page_size;
-- 
2.20.1

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[LTP] [PATCH 2/4] syscalls/ipc: shmctl04: Require full fscanf match

[Guixiong Wei via ltp]

Stop parsing /proc/sysvipc/shm when fscanf() does not match all
expected fields, to avoid using stale values from previous iterations.

Signed-off-by: Guixiong Wei <weiguixiong@bytedance.com>
---
 testcases/kernel/syscalls/ipc/shmctl/shmctl04.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c b/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c
index 908cd2926..967e5d4b2 100644
--- a/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c
+++ b/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c
@@ -68,7 +68,7 @@ static void parse_proc_sysvipc(struct shm_info *info)
 	 * size.
 	 */
 	while (fscanf(f, "%*i %i %*i %lu %*i %*i %*i %*i %*i %*i %*i %*i %*i %*i %i %i",
-			&shmid, &size, &rss, &swap) > 0) {
+			&shmid, &size, &rss, &swap) == 4) {
 		used_ids++;
 		shm_rss += rss/page_size;
 		shm_swp += swap/page_size;
-- 
2.20.1

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[LTP] [PATCH 3/4] syscalls/ipc: shmctl04: Use SAFE_FOPEN for /proc parsing

[Guixiong Wei via ltp]

Use SAFE_FOPEN/SAFE_FCLOSE when reading /proc/sysvipc/shm.

Signed-off-by: Guixiong Wei <weiguixiong@bytedance.com>
---
 testcases/kernel/syscalls/ipc/shmctl/shmctl04.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c b/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c
index 967e5d4b2..97e84efb6 100644
--- a/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c
+++ b/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c
@@ -22,6 +22,7 @@
 #include <stdio.h>
 #include <pwd.h>
 #include "tst_test.h"
+#include "tst_safe_stdio.h"
 #include "tst_safe_sysv_ipc.h"
 #include "tse_newipc.h"
 #include "lapi/shm.h"
@@ -42,7 +43,7 @@ static struct tcases {
 static void parse_proc_sysvipc(struct shm_info *info)
 {
 	int page_size = getpagesize();
-	FILE *f = fopen("/proc/sysvipc/shm", "r");
+	FILE *f = SAFE_FOPEN("/proc/sysvipc/shm", "r");
 	int used_ids = 0;
 	int shmid_max = 0;
 	unsigned long shm_rss = 0;
@@ -105,7 +106,7 @@ static void parse_proc_sysvipc(struct shm_info *info)
 		tst_res(TPASS, "shm_tot = %li", shm_tot);
 	}
 
-	fclose(f);
+	SAFE_FCLOSE(f);
 }
 
 static void verify_shminfo(unsigned int n)
-- 
2.20.1

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[LTP] [PATCH 4/4] syscalls/ipc: shmctl04: Fix shm_info print formats

[Guixiong Wei via ltp]

Use %lu when printing unsigned long counters parsed from /proc and
cast shm_info fields to match the format specifiers.

Signed-off-by: Guixiong Wei <weiguixiong@bytedance.com>
---
 testcases/kernel/syscalls/ipc/shmctl/shmctl04.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c b/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c
index 97e84efb6..f436e763d 100644
--- a/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c
+++ b/testcases/kernel/syscalls/ipc/shmctl/shmctl04.c
@@ -86,24 +86,24 @@ static void parse_proc_sysvipc(struct shm_info *info)
 	}
 
 	if (info->shm_rss != shm_rss) {
-		tst_res(TFAIL, "shm_rss = %li, expected %li",
+		tst_res(TFAIL, "shm_rss = %lu, expected %lu",
 			info->shm_rss, shm_rss);
 	} else {
-		tst_res(TPASS, "shm_rss = %li", shm_rss);
+		tst_res(TPASS, "shm_rss = %lu", shm_rss);
 	}
 
 	if (info->shm_swp != shm_swp) {
-		tst_res(TFAIL, "shm_swp = %li, expected %li",
+		tst_res(TFAIL, "shm_swp = %lu, expected %lu",
 			info->shm_swp, shm_swp);
 	} else {
-		tst_res(TPASS, "shm_swp = %li", shm_swp);
+		tst_res(TPASS, "shm_swp = %lu", shm_swp);
 	}
 
 	if (info->shm_tot != shm_tot) {
-		tst_res(TFAIL, "shm_tot = %li, expected %li",
+		tst_res(TFAIL, "shm_tot = %lu, expected %lu",
 			info->shm_tot, shm_tot);
 	} else {
-		tst_res(TPASS, "shm_tot = %li", shm_tot);
+		tst_res(TPASS, "shm_tot = %lu", shm_tot);
 	}
 
 	SAFE_FCLOSE(f);
-- 
2.20.1

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Re: [LTP] [PATCH 1/4] syscalls/ipc: shmctl04: Parse /proc/sysvipc/shm size as unsigned long

[Cyril Hrubis]

Hi!
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>

-- 
Cyril Hrubis
chrubis@suse.cz

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Re: [LTP] [PATCH 2/4] syscalls/ipc: shmctl04: Require full fscanf match

[Cyril Hrubis]

Hi!
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>

-- 
Cyril Hrubis
chrubis@suse.cz

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Re: [LTP] [PATCH 3/4] syscalls/ipc: shmctl04: Use SAFE_FOPEN for /proc parsing

[Cyril Hrubis]

Hi!
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>

-- 
Cyril Hrubis
chrubis@suse.cz

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Re: [LTP] [PATCH 4/4] syscalls/ipc: shmctl04: Fix shm_info print formats

[Cyril Hrubis]

Hi!
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>

-- 
Cyril Hrubis
chrubis@suse.cz

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Re: [LTP] [PATCH 0/4] syscalls/ipc: shmctl04: Fix /proc/sysvipc/shm parsing

[Andrea Cervesato via ltp]

Hi!

LGTM the whole series. I'm gonna merge it.

Reviewed-by: Andrea Cervesato <andrea.cervesato@suse.com>

-- 
Andrea Cervesato
SUSE QE Automation Engineer Linux
andrea.cervesato@suse.com


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Re: [LTP] [PATCH 0/4] syscalls/ipc: shmctl04: Fix /proc/sysvipc/shm parsing

[Andrea Cervesato via ltp]

Merged, thanks!

To 
   ..  master -> master

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