cve-2024-50048
Vulnerability from cvelistv5
Published
2024-10-21 19:39
Modified
2024-12-19 09:32
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fbcon: Fix a NULL pointer dereference issue in fbcon_putcs syzbot has found a NULL pointer dereference bug in fbcon. Here is the simplified C reproducer: struct param { uint8_t type; struct tiocl_selection ts; }; int main() { struct fb_con2fbmap con2fb; struct param param; int fd = open("/dev/fb1", 0, 0); con2fb.console = 0x19; con2fb.framebuffer = 0; ioctl(fd, FBIOPUT_CON2FBMAP, &con2fb); param.type = 2; param.ts.xs = 0; param.ts.ys = 0; param.ts.xe = 0; param.ts.ye = 0; param.ts.sel_mode = 0; int fd1 = open("/dev/tty1", O_RDWR, 0); ioctl(fd1, TIOCLINUX, &param); con2fb.console = 1; con2fb.framebuffer = 0; ioctl(fd, FBIOPUT_CON2FBMAP, &con2fb); return 0; } After calling ioctl(fd1, TIOCLINUX, &param), the subsequent ioctl(fd, FBIOPUT_CON2FBMAP, &con2fb) causes the kernel to follow a different execution path: set_con2fb_map -> con2fb_init_display -> fbcon_set_disp -> redraw_screen -> hide_cursor -> clear_selection -> highlight -> invert_screen -> do_update_region -> fbcon_putcs -> ops->putcs Since ops->putcs is a NULL pointer, this leads to a kernel panic. To prevent this, we need to call set_blitting_type() within set_con2fb_map() to properly initialize ops->putcs.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b97eebcce1b4f3f07a71f635d6aa3af96c236e7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8266ae6eafdcd5a3136592445ff4038bbc7ee80ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e5c2dba62996a3a6eeb34bd248b90fc69c5a6a1bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7fb5dda555344529ce584ff7a28b109528d2f1bPatch
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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    "datePublished": "2024-10-21T19:39:45.146Z",
    "dateReserved": "2024-10-21T12:17:06.072Z",
    "dateUpdated": "2024-12-19T09:32:04.833Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-50048\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T20:15:17.580\",\"lastModified\":\"2024-10-23T21:46:11.533\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfbcon: Fix a NULL pointer dereference issue in fbcon_putcs\\n\\nsyzbot has found a NULL pointer dereference bug in fbcon.\\nHere is the simplified C reproducer:\\n\\nstruct param {\\n\\tuint8_t type;\\n\\tstruct tiocl_selection ts;\\n};\\n\\nint main()\\n{\\n\\tstruct fb_con2fbmap con2fb;\\n\\tstruct param param;\\n\\n\\tint fd = open(\\\"/dev/fb1\\\", 0, 0);\\n\\n\\tcon2fb.console = 0x19;\\n\\tcon2fb.framebuffer = 0;\\n\\tioctl(fd, FBIOPUT_CON2FBMAP, \u0026con2fb);\\n\\n\\tparam.type = 2;\\n\\tparam.ts.xs = 0; param.ts.ys = 0;\\n\\tparam.ts.xe = 0; param.ts.ye = 0;\\n\\tparam.ts.sel_mode = 0;\\n\\n\\tint fd1 = open(\\\"/dev/tty1\\\", O_RDWR, 0);\\n\\tioctl(fd1, TIOCLINUX, \u0026param);\\n\\n\\tcon2fb.console = 1;\\n\\tcon2fb.framebuffer = 0;\\n\\tioctl(fd, FBIOPUT_CON2FBMAP, \u0026con2fb);\\n\\n\\treturn 0;\\n}\\n\\nAfter calling ioctl(fd1, TIOCLINUX, \u0026param), the subsequent ioctl(fd, FBIOPUT_CON2FBMAP, \u0026con2fb)\\ncauses the kernel to follow a different execution path:\\n\\n set_con2fb_map\\n  -\u003e con2fb_init_display\\n   -\u003e fbcon_set_disp\\n    -\u003e redraw_screen\\n     -\u003e hide_cursor\\n      -\u003e clear_selection\\n       -\u003e highlight\\n        -\u003e invert_screen\\n         -\u003e do_update_region\\n          -\u003e fbcon_putcs\\n           -\u003e ops-\u003eputcs\\n\\nSince ops-\u003eputcs is a NULL pointer, this leads to a kernel panic.\\nTo prevent this, we need to call set_blitting_type() within set_con2fb_map()\\nto properly initialize ops-\u003eputcs.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fbcon: soluciona un problema de desreferencia de puntero NULL en fbcon_putcs syzbot ha encontrado un error de desreferencia de puntero NULL en fbcon. Aqu\u00ed est\u00e1 el reproductor C simplificado: struct param { uint8_t type; struct tiocl_selection ts; }; int main() { struct fb_con2fbmap con2fb; struct param param; int fd = open(\\\"/dev/fb1\\\", 0, 0); con2fb.console = 0x19; con2fb.framebuffer = 0; ioctl(fd, FBIOPUT_CON2FBMAP, \u0026amp;con2fb); param.type = 2; param.ts.xs = 0; param.ts.ys = 0; param.ts.xe = 0; param.ts.ye = 0; param.ts.sel_mode = 0; int fd1 = open(\\\"/dev/tty1\\\", O_RDWR, 0); ioctl(fd1, TIOCLINUX, \u0026amp;param); con2fb.console = 1; con2fb.framebuffer = 0; ioctl(fd, FBIOPUT_CON2FBMAP, \u0026amp;con2fb); devolver 0; } Despu\u00e9s de llamar a ioctl(fd1, TIOCLINUX, \u0026amp;param), el ioctl(fd, FBIOPUT_CON2FBMAP, \u0026amp;con2fb) subsiguiente hace que el n\u00facleo siga una ruta de ejecuci\u00f3n diferente: set_con2fb_map -\u0026gt; con2fb_init_display -\u0026gt; fbcon_set_disp -\u0026gt; redraw_screen -\u0026gt; hide_cursor -\u0026gt; clear_selection -\u0026gt; highlight -\u0026gt; invert_screen -\u0026gt; do_update_region -\u0026gt; fbcon_putcs -\u0026gt; ops-\u0026gt;putcs Dado que ops-\u0026gt;putcs es un puntero NULL, esto lleva a un p\u00e1nico del n\u00facleo. 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}


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