Messages in this thread Patch in this message | | | Date | Mon, 13 Sep 2004 19:36:34 -0700 | From | William Lee Irwin III <> | Subject | [pidhashing] [3/3] enforce PID_MAX_LIMIT in sysctls |
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On Mon, Sep 13, 2004 at 07:31:14PM -0700, William Lee Irwin III wrote: > /proc/ breaks when PID_MAX_LIMIT is elevated on 32-bit, so this patch > lowers it there. Compiletested on x86-64.
The pid_max sysctl doesn't enforce PID_MAX_LIMIT or sane lower bounds. RESERVED_PIDS + 1 is the minimum pid_max that won't break alloc_pidmap(), and PID_MAX_LIMIT may not be aligned to 8*PAGE_SIZE boundaries for unusual values of PAGE_SIZE, so this also rounds up PID_MAX_LIMIT to it. Compiletested on x86-64.
Index: mm5-2.6.9-rc1/kernel/pid.c =================================================================== --- mm5-2.6.9-rc1.orig/kernel/pid.c 2004-09-13 16:30:21.980111568 -0700 +++ mm5-2.6.9-rc1/kernel/pid.c 2004-09-13 16:33:06.324127480 -0700 @@ -36,7 +36,10 @@ #define RESERVED_PIDS 300 -#define PIDMAP_ENTRIES (PID_MAX_LIMIT/PAGE_SIZE/8) +int pid_max_min = RESERVED_PIDS + 1; +int pid_max_max = PID_MAX_LIMIT; + +#define PIDMAP_ENTRIES ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8) #define BITS_PER_PAGE (PAGE_SIZE*8) #define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1) #define mk_pid(map, off) (((map) - pidmap_array)*BITS_PER_PAGE + (off)) Index: mm5-2.6.9-rc1/kernel/sysctl.c =================================================================== --- mm5-2.6.9-rc1.orig/kernel/sysctl.c 2004-09-13 16:27:44.621033784 -0700 +++ mm5-2.6.9-rc1/kernel/sysctl.c 2004-09-13 16:40:46.358191672 -0700 @@ -68,6 +68,7 @@ extern int sched_base_timeslice; extern int sched_min_base; extern int sched_max_base; +extern int pid_max_min, pid_max_max; #if defined(CONFIG_X86_LOCAL_APIC) && defined(__i386__) int unknown_nmi_panic; @@ -577,7 +578,10 @@ .data = &pid_max, .maxlen = sizeof (int), .mode = 0644, - .proc_handler = &proc_dointvec, + .proc_handler = &proc_dointvec_minmax, + .strategy = sysctl_intvec, + .extra1 = &pid_max_min, + .extra2 = &pid_max_max, }, { .ctl_name = KERN_PANIC_ON_OOPS, - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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