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| author | Helge Deller <deller@gmx.de> | 2018-10-12 22:37:46 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2018-10-17 08:18:01 +0200 |
| commit | 3c229b3f2dd8133f61bb81d3cb018be92f4bba39 (patch) | |
| tree | bff3ada8bcb9d2b031300f94f8a0a79874aee84e /arch/parisc/mm | |
| parent | 4dd5b673fa625d647447ae4c477bf946ae877711 (diff) | |
| download | linux-3c229b3f2dd8133f61bb81d3cb018be92f4bba39.tar.gz linux-3c229b3f2dd8133f61bb81d3cb018be92f4bba39.tar.bz2 linux-3c229b3f2dd8133f61bb81d3cb018be92f4bba39.zip | |
parisc: Fix map_pages() to not overwrite existing pte entries
Fix a long-existing small nasty bug in the map_pages() implementation which
leads to overwriting already written pte entries with zero, *if* map_pages() is
called a second time with an end address which isn't aligned on a pmd boundry.
This happens for example if we want to remap only the text segment read/write
in order to run alternative patching on the code. Exiting the loop when we
reach the end address fixes this.
Cc: stable@vger.kernel.org
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/mm')
| -rw-r--r-- | arch/parisc/mm/init.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c index 74842d28a7a1..aae9b0d71c1e 100644 --- a/arch/parisc/mm/init.c +++ b/arch/parisc/mm/init.c @@ -494,12 +494,8 @@ static void __init map_pages(unsigned long start_vaddr, pte = pte_mkhuge(pte); } - if (address >= end_paddr) { - if (force) - break; - else - pte_val(pte) = 0; - } + if (address >= end_paddr) + break; set_pte(pg_table, pte); |