On the write to ve.os_release file patch the linux_version_code in the .note section of vdso.
https://jira.sw.ru/browse/PSBM-121668 Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com> --- arch/x86/entry/vdso/vdso-note.S | 2 ++ arch/x86/entry/vdso/vdso2c.c | 1 + arch/x86/entry/vdso/vdso32/note.S | 2 ++ arch/x86/include/asm/vdso.h | 1 + kernel/ve/ve.c | 7 +++++++ 5 files changed, 13 insertions(+) diff --git a/arch/x86/entry/vdso/vdso-note.S b/arch/x86/entry/vdso/vdso-note.S index 79a071e4357e..c0e6e65f9fec 100644 --- a/arch/x86/entry/vdso/vdso-note.S +++ b/arch/x86/entry/vdso/vdso-note.S @@ -7,6 +7,8 @@ #include <linux/version.h> #include <linux/elfnote.h> + .globl linux_version_code ELFNOTE_START(Linux, 0, "a") +linux_version_code: .long LINUX_VERSION_CODE ELFNOTE_END diff --git a/arch/x86/entry/vdso/vdso2c.c b/arch/x86/entry/vdso/vdso2c.c index 4674f58581a1..7fab0bd96ac1 100644 --- a/arch/x86/entry/vdso/vdso2c.c +++ b/arch/x86/entry/vdso/vdso2c.c @@ -109,6 +109,7 @@ struct vdso_sym required_syms[] = { {"__kernel_sigreturn", true}, {"__kernel_rt_sigreturn", true}, {"int80_landing_pad", true}, + {"linux_version_code", true}, }; __attribute__((format(printf, 1, 2))) __attribute__((noreturn)) diff --git a/arch/x86/entry/vdso/vdso32/note.S b/arch/x86/entry/vdso/vdso32/note.S index 9fd51f206314..096b62f14863 100644 --- a/arch/x86/entry/vdso/vdso32/note.S +++ b/arch/x86/entry/vdso/vdso32/note.S @@ -10,7 +10,9 @@ /* Ideally this would use UTS_NAME, but using a quoted string here doesn't work. Remember to change this when changing the kernel's name. */ + .globl linux_version_code ELFNOTE_START(Linux, 0, "a") +linux_version_code: .long LINUX_VERSION_CODE ELFNOTE_END diff --git a/arch/x86/include/asm/vdso.h b/arch/x86/include/asm/vdso.h index 27566e57e87d..92c7ac06828e 100644 --- a/arch/x86/include/asm/vdso.h +++ b/arch/x86/include/asm/vdso.h @@ -27,6 +27,7 @@ struct vdso_image { long sym___kernel_rt_sigreturn; long sym___kernel_vsyscall; long sym_int80_landing_pad; + long sym_linux_version_code; }; #ifdef CONFIG_X86_64 diff --git a/kernel/ve/ve.c b/kernel/ve/ve.c index 03b8d126a0ed..98c2e7e3d2c6 100644 --- a/kernel/ve/ve.c +++ b/kernel/ve/ve.c @@ -954,6 +954,7 @@ static ssize_t ve_os_release_write(struct kernfs_open_file *of, char *buf, { struct cgroup_subsys_state *css = of_css(of); struct ve_struct *ve = css_to_ve(css); + int n1, n2, n3, new_version; char *release; int ret = 0; @@ -964,6 +965,12 @@ static ssize_t ve_os_release_write(struct kernfs_open_file *of, char *buf, goto up_opsem; } + if (sscanf(buf, "%d.%d.%d", &n1, &n2, &n3) == 3) { + new_version = ((n1 << 16) + (n2 << 8)) + n3; + *((int *)(ve->vdso_64->data + ve->vdso_64->sym_linux_version_code)) = new_version; + *((int *)(ve->vdso_32->data + ve->vdso_32->sym_linux_version_code)) = new_version; + } + down_write(&uts_sem); release = ve->ve_ns->uts_ns->name.release; strncpy(release, buf, __NEW_UTS_LEN); -- 2.26.2 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel
