The patch titled pagemap: require aligned-length, non-null reads of /proc/pid/pagemap has been removed from the -mm tree. Its filename was pagemap-require-aligned-length-non-null-reads-of-proc-pid-pagemap.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: pagemap: require aligned-length, non-null reads of /proc/pid/pagemap From: Vitaly Mayatskikh <v.mayatskih@xxxxxxxxx> The intention of commit aae8679b0ebcaa92f99c1c3cb0cd651594a43915 ("pagemap: fix bug in add_to_pagemap, require aligned-length reads of /proc/pid/pagemap") was to force reads of /proc/pid/pagemap to be a multiple of 8 bytes, but now it allows to read 0 bytes, which actually puts some data to user's buffer. According to POSIX, if count is zero, read() should return zero and has no other results. Signed-off-by: Vitaly Mayatskikh <v.mayatskih@xxxxxxxxx> Cc: Thomas Tuttle <ttuttle@xxxxxxxxxx> Acked-by: Matt Mackall <mpm@xxxxxxxxxxx> Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx> Cc: <stable@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/proc/task_mmu.c | 4 ++++ 1 file changed, 4 insertions(+) diff -puN fs/proc/task_mmu.c~pagemap-require-aligned-length-non-null-reads-of-proc-pid-pagemap fs/proc/task_mmu.c --- a/fs/proc/task_mmu.c~pagemap-require-aligned-length-non-null-reads-of-proc-pid-pagemap +++ a/fs/proc/task_mmu.c @@ -665,6 +665,10 @@ static ssize_t pagemap_read(struct file goto out_task; ret = 0; + + if (!count) + goto out_task; + mm = get_task_mm(task); if (!mm) goto out_task; _ Patches currently in -mm which might be from v.mayatskih@xxxxxxxxx are origin.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html